Basler DECS-250 Instruction Manual
  1. Manuals
  2. Brands
  3. Basler Manuals
  4. Control Systems
  5. DECS-250
  6. Instruction manual

Basler DECS-250 Instruction Manual

Digital excitation control system
Hide thumbs Also See for DECS-250:
Table of Contents

Advertisement

Quick Links

12570 Route 143 • Highland, Illinois 62249-1074 USA
Tel +1 618.654.2341 • Fax +1 618.654.2351
www.basler.com • info@basler.com
DECS-250
Digital Excitation Control System
Instruction Manual
Publication
9440300990 Rev S
January 2020

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the DECS-250 and is the answer not in the manual?

Questions and answers

Related Manuals for Basler DECS-250

Summary of Contents for Basler DECS-250

  • Page 1 DECS-250 Digital Excitation Control System Instruction Manual Publication 12570 Route 143 • Highland, Illinois 62249-1074 USA Tel +1 618.654.2341 • Fax +1 618.654.2351 9440300990 Rev S www.basler.com • info@basler.com January 2020...
  • Page 2 Proposition 65 warning, we are notifying you that one or more of the Proposition 65 listed chemicals may be present in products we sell to you. For more information about the specific chemicals found in this product, please visit https://www.basler.com/Prop65.
  • Page 3 9440300990 Preface This instruction manual provides information about the installation and operation of the DECS-250 Digital Excitation Control System. To accomplish this, the following information is provided: • General Information Human-machine interface • Functional description • Installation • BESTCOMSPlus software •...
  • Page 4 The availability and design of all features and options are subject to modification without notice. Over time, improvements and revisions may be made to this publication. Before performing any of the following procedures, contact Basler Electric for the latest revision of this manual.
  • Page 5 For a complete copy of GNU GENERAL PUBLIC LICENSE Version 2, June 1991 or GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999 refer to www.gnu.org or contact Basler Electric. You, as a Basler Electric Company customer, agree to abide by the terms and conditions of GNU GENERAL PUBLIC LICENSE Version 2, June 1991 or GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999, and as such...
  • Page 6 9440300990 Preface DECS-250...
  • Page 7 9440300990 Revision History A historical summary of the changes made to this instruction manual is provided below. Revisions are listed in reverse chronological order. Visit www.basler.com to download the latest hardware, firmware, and BESTCOMSPlus revision ® histories. Instruction Manual Revision History...
  • Page 8 Added descriptions for Cursors Enabled and Sync Graph Scrolling • settings on the Analysis Options screen in the Testing chapter Added EAC certification in the Specifications chapter • Minor text edits throughout manual • This revision letter not used • Revision History DECS-250...
  • Page 9 9440300990 Manual Change Revision and Date H, Feb-15 Added support for DECS-250 firmware version 1.03.00 and • BESTCOMSPlus version 3.08.00 Changed layout of Auxiliary Control Gains section and added • equations in the Auxiliary Control chapter • Added Off-Page Objects description in the BESTlogicPlus chapter •...
  • Page 10 • Minor edits to Modbus™ communication legacy register table • Added caution statements in several places recommending proper • grounding of the DECS-250 when using the non-isolated USB port C, Nov-12 Updated operating temperature and frequency specifications • B, Oct-12 •...

  • Page 11: Table Of Contents

    Configuration ............................23-1 Security ..............................24-1 Timekeeping ............................. 25-1 Testing ..............................26-1 CAN Communication ..........................27-1 Modbus® Communication ........................28-1 PROFIBUS Communication ........................29-1 Maintenance ............................. 30-1 Specifications ............................31-1 Analog Expansion Module ........................32-1 Contact Expansion Module ........................33-1 DECS-250 Contents...
  • Page 12 9440300990 Contents DECS-250...

  • Page 13: Introduction

    9440300990 1 • Introduction DECS-250 Digital Excitation Control Systems offer precise excitation control and machine protection in a compact package. DECS-250 adaptability to many applications is assured through configurable contact inputs and outputs, flexible communication capabilities, and programmable logic implemented with the provided BESTCOMSPlus software.
  • Page 14 Power factor and var metering values will be opposite in motor mode. Excitation power is supplied from the DECS-250 by means of a filtered, switching power module that uses pulse-width modulation. It is capable of supplying 15 Adc (or 20 Adc up to 55°C (131°F)) continuously at a nominal voltage of 32, 63, or 125 Vdc.
  • Page 15 Figure 1-1. DECS-250 Style Chart Storage If a DECS-250 will not be placed in service right away, store it in the original shipping carton in a moisture- and dust-free environment. The temperature of the storage environment must be within the range of –40 to 85°C (–40 to 185°F).
  • Page 16 9440300990 Introduction DECS-250...

  • Page 17: Controls And Indicators

    (LCD). Front Panel Illustration and Description DECS-250 controls and indicators are illustrated in Figure 2-1 and described in Table 2-1. The locators and descriptions of Table 2-1 correspond to the locators shown in Figure 2-1. Figure 2-1. Front Panel Controls and Indicators...
  • Page 18 “bumpless” transfer when changing active modes. Menu Navigation The DECS-250 provides local access to DECS-250 settings and metering values through a menu structure displayed on the front panel LCD. An overview of the menu structure is illustrated in Figure 2-2.
  • Page 19 Sleep mode reduces the demand on control power by turning off the LCD backlight when no pushbutton activity is seen for the duration of the LCD Backlight Timeout setting. Language Language modules are available for the DECS-250. Once a language module is implemented it can be enabled via the Language Selection setting. Screen Scrolling The display can be set to automatically scroll through a user-selected list of metered values.
  • Page 20 9440300990 Figure 2-3. Front Panel HMI Settings Controls and Indicators DECS-250...

  • Page 21: Power Inputs

    During DECS-250 power-up, the optional ICRM prevents damage to the DECS-250 by limiting inrush current to a safe level. When operating power is applied to the DECS-250, the ICRM limits the inrush current by adding a high level of resistance between the DECS-250 and the power source. Once the inrush current subsides, the series resistance diminishes quickly to allow nominal, steady-state current flow.
  • Page 22 To prevent damage to the DECS-250, the use of the ICRM is recommended when using a low impedance source, such as a wall outlet. For a detailed description of the Inrush Current Reduction Module, refer to Basler publication 9387900990. ICRM connections are illustrated in the Typical Connections chapter. Power Inputs...

  • Page 23: Power Stage

    9440300990 4 • Power Stage The DECS-250 supplies regulated dc excitation power to the field of a brushless exciter. Excitation power is supplied at terminals F+ and F–. DECS-250 power stage operating power accepts single- or three-phase ac power from a transformer or PMG.
  • Page 24 9440300990 Power Stage DECS-250...

  • Page 25: Voltage And Current Sensing

    DECS-250 terminals CTB+ and CTB–. The DECS-250 is compatible with CTs having 5 Aac or 1 Aac nominal secondary ratings. The DECS-250 uses this secondary rating, along with the CT nominal primary ratings to interpret the sensed current and calculate system parameters.
  • Page 26 Cross-current compensation (reactive differential) mode allows two or more paralleled generators to share a common load. As shown in Figure 5-3, each generator is controlled by a DECS-250 using the DECS-250 cross-current compensation input (terminals CCCT+ and CCCT–) and a dedicated, external current transformer (CT) to sense generator current.
  • Page 27 These features are discussed in the Synchronizer chapter of this manual. Three-phase bus sensing voltage is applied to DECS-250 terminals B1, B2, and B3. This sensing voltage is typically applied through a user-supplied voltage transformer, but may be applied directly.
  • Page 28 9440300990 Voltage and Current Sensing DECS-250...

  • Page 29: Synchronizer

    To minimize the impact on the bus during synchronization, the generator frequency can be forced to exceed the bus frequency at the moment of breaker closure. If this is the case, the DECS-250 will drive the generator frequency higher than the bus frequency before closing the breaker. The breaker closing angle setting defines the maximum allowable phase angle difference between the generator and bus.
  • Page 30 A generator to bus PT matching level setting is provided to compensate for step-up or step-down transformers in the system. The DECS-250 adjusts the sensed generator voltage by this percentage. This setting also appears on the Voltage Matching screen, below. When the value is changed, it is reflected in ������������...
  • Page 31 During anticipatory-mode synchronization, if the generator breaker is serving to tie the generator to the bus, the DECS-250 uses the breaker closing time to calculate the optimum time to close the breaker. For a pulse-controlled generator breaker, the breaker open and close pulse times are used by the DECS-250 when issuing open and close commands to the breaker.
  • Page 32 Bus Condition A dead bus is recognized by the DECS-250 when the bus voltage decreases below the dead bus threshold for the duration of the dead bus activation delay. Synchronizer...
  • Page 33 Breaker closure is not considered if the voltage conditions are not within the stability pickup and dropout settings for the duration of the stability activation delay. Figure 6-4. Generator and Bus Condition Detection Settings DECS-250 Synchronizer...
  • Page 34 During synchronization, the DECS-250 adjusts the generator voltage and frequency by issuing speed correction signals to the speed governor. Correction signals are issued in the form of DECS-250 output contact closures. These correction signals may be either continuous, fixed, or proportional. When fixed correction is selected, the correction pulses equal the Correction Pulse Width and Correction Pulse Interval settings.

  • Page 35: Regulation

    9440300990 7 • Regulation The DECS-250 precisely regulates the level of supplied excitation power in each of the five available regulation modes. Stable regulation is enhanced by the automatic tracking of the active-mode setpoint by the inactive regulation modes. Pre-position setpoints within each regulation mode enable the DECS-250 to be configured for multiple system and application needs.
  • Page 36 DECS-250 to a secondary DECS. When operating in FVR mode, the DECS-250 regulates the level of field voltage it supplies to the field based on the FVR setpoint. The setting range of the FVR setpoint depends on the field rated data and other associated settings.
  • Page 37 Var mode settings are illustrated in Figure 7-2. Power Factor When operating in Power Factor (PF) mode, the DECS-250 controls the var output of the generator to maintain the Power Factor setpoint as the kW load on the generator varies. The setting range of the PF setpoint is determined by the PF –...
  • Page 38 Figure 7-2. Var and Power Factor Regulation Settings Pre-Position Setpoints Each regulation mode has three pre-position setpoints which allow the DECS-250 to be configured for multiple system and application needs. Each pre-position setpoint can be assigned to a programmable contact input. When the appropriate contact input is closed, the setpoint is driven to the corresponding pre-position value.
  • Page 39 HMI Navigation Path: Settings, Operating Settings, Parallel/LineDrop Compensation The DECS-250 can be used to control the excitation level of two or more generators operating in parallel so that the generators share the reactive load. The DECS-250 can employ either droop compensation or...
  • Page 40 A Load Share ID setting identifies the DECS-250 as a load sharing unit in the network. Checking a Load Sharing Unit number box allows any DECS-250 load sharing units on the network with that Load Share ID number to share load with the currently connected DECS-250.
  • Page 41 The new line drop adjusted setpoint is calculated using Equation 7-4. �������������������������������� ������������������������ ���� ���� ������������������������ ���� ���� ������������������������ Equation 7-4. Line Drop Adjusted Setpoint Refer to Figure 7-5 for an illustration of the Line drop compensation settings. DECS-250 Regulation...
  • Page 42 BESTCOMSPlus Navigation Path: Settings Explorer, Operating Settings, Autotracking HMI Navigation Path: Settings, Operating Settings, Autotracking. Internal regulation mode setpoint tracking is a standard feature on the DECS-250. External setpoint tracking is optional (style xx2xxxx). Autotracking settings are illustrated in Figure 7-6.
  • Page 43 9440300990 Internal Setpoint Tracking In applications using a single DECS-250, internal tracking can be enabled so that the inactive regulation modes track the active regulation mode. The following examples demonstrate the advantages of internal tracking: If the excitation system is operating online with internal tracking enabled, a loss of sensing condition •...
  • Page 44 7-10 9440300990 Regulation DECS-250...

  • Page 45: Auxiliary Control

    Minimum and maximum setpoint limits are observed when the With Limit box is checked. Auxiliary Control Gains When a current input type is selected, the input current is converted internally by the DECS-250 into a voltage signal in the range of –10 to +10 Vdc. The DECS-250 uses the following equation when converting the applied current into a voltage.
  • Page 46 The auxiliary control signal can be configured to control the inner or outer regulation control loop. Selecting the inner loop limits auxiliary control to AVR, FCR, and FVR modes. Selecting the outer loop limits auxiliary control to PF and Var modes. Auxiliary Control DECS-250...
  • Page 47 9440300990 Figure 8-1. Auxiliary Input Settings DECS-250 Auxiliary Control...
  • Page 48 9440300990 Auxiliary Control DECS-250...

  • Page 49: Contact Inputs And Outputs

    BESTCOMSPlus Navigation Path: Settings Explorer, Programmable Inputs, Contact Inputs HMI Navigation Path: Not available through HMI. Sixteen contact inputs are provided for initiating DECS-250 actions. Two of the contact inputs are fixed- function inputs: Start and Stop. The remaining 14 contact inputs are programmable. An additional 10 contact inputs are available with the optional Contact Expansion Module (CEM-2020).
  • Page 50 BESTCOMSPlus Navigation Path: Settings Explorer, Programmable Outputs, Contact Outputs HMI Navigation Path: Not available through HMI. DECS-250 contact outputs consist of a dedicated watchdog output and 11 programmable outputs. An additional 18 contact outputs are available with the optional Contact Expansion Module (CEM-2020H).
  • Page 51 9440300990 Figure 9-2. Contact Output Label Text DECS-250 Contact Inputs and Outputs...
  • Page 52 9440300990 Contact Inputs and Outputs DECS-250...

  • Page 53: Protection

    Several volts per hertz settings enable the DECS-250 to provide flexible generator and generator step-up transformer overexcitation protection. An inverse square timing characteristic is provided through the Inverse Time Pickup Setpoint and Time Dial settings.
  • Page 54 10-2 9440300990 Figure 10-1. V/Hz Characteristic – Time Shown on Vertical Axis Figure 10-2. V/Hz Characteristic – Time Shown on Horizontal Axis Protection DECS-250...
  • Page 55 The Undervoltage pickup has a native unit of Primary Volts and the rated data associated with it is Machine Rated Data, Voltage (on the System Parameters, Rated Data screen). BESTCOMSPlus generator undervoltage settings are illustrated in Figure 10-4. ® DECS-250 Protection...
  • Page 56 The generator voltage is monitored for a loss of sensing (LOS) condition. LOS protection settings are illustrated in Figure 10-6. In the DECS-250, a loss of sensing (LOS) event is calculated using sequence components. LOS trip criteria is listed in Table 10-1.
  • Page 57 An overfrequency condition occurs when the frequency of the generator voltage exceeds the 81O pickup threshold for the duration of the 81O time delay setting. Overfrequency protection can be enabled and disabled without altering the pickup and time delay settings. Overfrequency pickup and trip elements in DECS-250 Protection...
  • Page 58 Underfrequency pickup and trip elements in BESTlogicPlus can be used in a logic scheme to initiate corrective action in response to the condition. BESTCOMSPlus underfrequency settings are illustrated in Figure 10-8. Figure 10-8. Underfrequency Protection Settings Protection DECS-250...
  • Page 59 However, recovery from power system swings after a major fault may take several seconds. Therefore, if the unit is to pick up near the steady-state capability curve of the generator, longer time delays are recommended. See Figure 10-10 for details. DECS-250 Protection...
  • Page 60 9440300990 Motor Protection The DECS-250 compares the real power (kW) flowing into the motor with the reactive power (kvar) being supplied. Operation of synchronous motors drawing reactive power from the system can result in overheating in parts of the rotor that do not normally carry current. The 40Q pickup response is shown in Figure 10-10.
  • Page 61 Field Protection BESTCOMSPlus Navigation Path: Settings Explorer, Protection, Field HMI Navigation Path: Settings, Protection, Field Field protection provided by the DECS-250 includes field overvoltage, field overcurrent, an exciter diode monitor, and power input failure. Field Overvoltage A field overvoltage condition occurs when the field voltage exceeds the field overvoltage threshold for the duration of the field overvoltage time delay.
  • Page 62 Rated Data, Current – Full Load (on the System Parameters, Rated Data screen). BESTCOMSPlus field overcurrent settings are illustrated in Figure 10-13. In BESTCOMSPlus, a plot of the field overcurrent setting curve is displayed. The plot can display the primary or secondary setting curves. Protection DECS-250...
  • Page 63 An EDM disable level setting prevents nuisance annunciations due to low excitation current or the generator frequency being out of range. A disable level setting can be used to disable both open- and DECS-250 Protection...
  • Page 64 Setting the Pickup Level—Number of Generator Poles Unknown The DECS-250 can detect shorted diode conditions when the number of generator poles is not known. To provide this protection, disable open diode protection, set the pole ratio to 1.0, and enable shorted diode protection.
  • Page 65 DECS-250 settings reflect a 3-phase power configuration but the actual operating power configuration is 1-phase then the DECS-250 will interpret the one phase as an imbalance and set an alarm/trip. For more information on 1- and 3-phase operating power settings see Configuration and Specifications.
  • Page 66 BESTCOMSPlus Navigation Path: Settings Explorer, Protection, Configurable Protection HMI Navigation Path: Settings, Protection, Configurable Protection The DECS-250 has eight configurable protection elements which can be used to supplement the standard DECS-250 protection. BESTCOMSPlus configurable protection settings are illustrated in Figure 10-17.
  • Page 67 Thermocouple 1 or 2 • Protection can be always enabled or enabled only when the DECS-250 is enabled and supplying excitation. When protection is enabled only in Start mode, an arming time delay can be used to delay protection following the start of excitation.
  • Page 68 10-16 9440300990 Figure 10-17. Configurable Protection Settings Protection DECS-250...

  • Page 69: Limiters

    The Offline, High-Level OEL threshold is determined by the High Level and High Time settings. When the excitation level exceeds the High Level setting, the DECS-250 acts to limit the excitation to the value of the High-Level setting and a High Level Timer is initiated. If this level of excitation persists until this timer reaches the High Time setting, the DECS-250 acts to limit the excitation to the value of the Low-Level setting.
  • Page 70 DECS-250. The generator is permitted to operate indefinitely with this level of excitation. When the excitation level exceeds the low-level setting for the duration of the medium and high time settings, the DECS-250 acts to limit the excitation to the value of the low-level setting.
  • Page 71 Figure 11-5. Separate curves may be selected for online and offline operation. If the system enters an overexcitation condition, the field current is limited and forced to follow the selected curve. The inverse time characteristic is defined by Equation 11-1. DECS-250 Limiters...
  • Page 72 , a plot of the takeover OEL setting curves is displayed. Settings enable selection of ® the displayed curves. The plot can display the primary or secondary setting curves, the offline or online settings curves, and the pick up or reset settings curves. Limiters DECS-250...
  • Page 73 UEL operates in all regulation modes. UEL behavior in manual mode can be configured to limit excitation or issue an alarm. This behavior is configured in BESTlogicPlus. Note For UEL to operate, the PARALLEL_EN_LM logic block must be set true in BESTlogicPlus programmable logic. DECS-250 Limiters...
  • Page 74 UEL voltage dependency real-power exponent. UEL voltage dependency is further defined by a real power filter time constant that is applied to the low-pass filter for the real power output. Figure 11-7. UEL Configuration Settings Limiters DECS-250...
  • Page 75 Excessive stator current with lagging power factor calls for reduced excitation. The SCL can be enabled in all regulation modes. When operating in Manual mode, the DECS-250 will announce high stator current but will not act to limit it. Primary and secondary SCL setting groups provide additional control for two distinct machine operating conditions.
  • Page 76 High-Level setting and a High Level Timer is initiated. If this level of current persists until this timer reaches the High-Level Time setting, the DECS-250 acts to limit the current to the value of the Low- level SCL setting.
  • Page 77 VA rating for the machine. A delay setting establishes a time delay between when the var threshold is exceeded and the DECS-250 acts to limit the var flow.
  • Page 78 If the generator frequency decreases below the corner frequency for the selected underfrequency slope (Figure 11-13), the DECS-250 adjusts the voltage setpoint so that the generator voltage follows the underfrequency slope. The adjustment range of the corner frequency and slope settings enables the DECS-250 to precisely match the operating characteristics of the prime mover and the loads being applied to the generator.
  • Page 79 The regulation setpoint is prevented from exceeding the value of the high limit threshold at all times. DECS-250 Limiters...
  • Page 80 11-12 9440300990 Figure 11-15. Underfrequency/Volts per Hertz Limiter Settings Limiters DECS-250...

  • Page 81: Grid Code

    The Low Frequency region in Figure 12-1 is defined by two settings: Min Frequency for Disconnect and Min Frequency for Continuous Operation. When grid frequency is within the range defined by these two settings, the Frequency Disconnect timer is active. DECS-250 Grid Code...
  • Page 82 Note Rather than performing the disconnection, the DECS-250 issues a logic indication which can be used to energize a physical output. See the BESTlogic™Plus chapter for details on the GCC Disconnected status input.
  • Page 83 HMI Navigation Path: Settings, Operating Settings, Grid Code Settings, Active Power Control The DECS-250 runs in Active Power Control mode continuously when grid frequency is normal (within the dead band). It shifts into Limited Frequency Sensitive Mode (LFSM) when grid frequency is outside the dead band.
  • Page 84 Auxiliary Input To use the DECS-250 auxiliary input as the grid code Active Power Control adjustment source, make the following settings: On the Auxiliary Input screen, set the Input Function setting to Grid Code Input. Refer to the •...
  • Page 85 Figure 12-4. LFSM Characteristic and Maximum Power Limit Characteristic Grid Recovery Mode When the DECS-250 is operating in LFSM and the grid frequency returns to normal (within the dead band), Grid Recovery mode becomes the active control mode. In this mode, grid recovery ramp rates are used and grid frequency must remain within the dead band for the duration for the grid recovery timer before returning to Active Power Control mode.
  • Page 86 The Recovery Time setting establishes the amount of time the grid frequency must remain within the dead band before the grid is deemed stable and the DECS-250 can return to Active Power Control mode. Power output ramp rates are established by the Recovery Power Increase Rate and Recovery Power Decrease Rate settings.
  • Page 87 The Mode Selection setting establishes the active LVRT reactive power control mode. When an input on the LVRT_MODE_SELECT logic element is held true, the corresponding LVRT reactive power control mode becomes the active mode, overriding the mode specified by the Mode Selection setting. DECS-250 Grid Code...
  • Page 88 The operating setpoint is typically a fixed value but may be remotely adjusted in steps of 0.5% U . Such adjustment results in a horizontal shift of the characteristic (see Figure 12-8). The ability to remotely modify the setpoint is specified by the network operator at the time of system planning. Grid Code DECS-250...
  • Page 89 Q(PF) operation with a PF of 1.0. The network operator may also arrange a switch to one of the other Reactive Power control modes instead. Adjustment Sources The Q(U) setpoint may be adjusted by the DECS-250 auxiliary input, an Analog Expansion Module AEM-2020 analog input, or via remote communication (Modbus or CAN bus). For all adjustment ®...
  • Page 90 Figure 12-10, below. Above 20% active power, the reactive power range should be -0.33 to 0.33 per unit reactive power. Figure 12-10. Q(P) Characteristic Curve Figure 12-11 illustrates an example characteristic with five plotted points. Grid Code DECS-250...
  • Page 91 BESTlogicPlus chapter for details. Figure 12-12. LVRT Mode Select Logic Element If LVRT Mode is enabled, but no operating mode is specified, the default operating mode will be Power Factor with a power factor setting of 1.0. DECS-250 Grid Code...
  • Page 92 Figure 12-14. This is accomplished by imposing voltage dependent limits on the reactive power output that can be achieved. Grid Code DECS-250...
  • Page 93 The network operator specifies the four points when the installation is planned. Unless specified by the network operator, the following value pairs apply: P1 (0.94; 0.33), P2 (0.96;0), P3( 1.04; 0), P4 (1.06, -0.33) An example characteristic is shown in Figure 12-15. DECS-250 Grid Code...
  • Page 94 After modification of the value (Qref/Pb inst), the machine output must achieve the specified output level within a maximum of four minutes. Adjustment Sources The Q(Voltage Limit) setpoint may be adjusted by the DECS-250 auxiliary input, an Analog Expansion Module AEM-2020 analog input, or via remote communication (Modbus or CAN bus). For all adjustment ®...
  • Page 95 2% for plants with less than 2 MW output and 4% for plants with greater than 4 MW output. Q(PF) Adjustment. In the DECS-250, power factor is defined such that it is positive when reactive power is exported and negative when reactive power is imported. When PF = 1.0, or -1.0, the power is pure real power so Reactive Power = 0.
  • Page 96 See Figure 12-19. Figure 12-19. Power Factor: Negative Adjustment Sources The Q(PF) setpoint may be adjusted by the DECS-250 auxiliary input, an Analog Expansion Module AEM-2020 analog input, or via remote communication (Modbus or CAN bus). For all adjustment ®...
  • Page 97 9440300990 12-17 Auxiliary Input To use the DECS-250 auxiliary input as the Q(PF) adjustment source, make the following settings: On the Auxiliary Input screen, set the Input Function setting to Grid Code Input. Refer to the • Auxiliary Control chapter for details.
  • Page 98 Modbus, an Active Power Control Remote Communications Failure occurs. The same is true for CAN bus communication. If an AEM Comms Failure is detected by the DECS-250 and the Adjust Source is set to an AEM analog input, an Active Power Control Remote Communications Failure occurs.
  • Page 99 The duration of the grid code test is established by the Max Time For Testing setting. This timer begins when the Send to Device button is clicked. When the timer expires, the frequency and voltage biases are no longer applied. Figure 12-22. Grid Code Test Screen DECS-250 Grid Code...
  • Page 100 12-20 9440300990 Grid Code DECS-250...

  • Page 101: Metering

    The DECS-250 provides comprehensive metering of internal and system conditions. These capabilities include extensive parameter metering, status indication, reporting, and real-time metering analysis. Metering Explorer DECS-250 metering is accessed through the metering explorer menu on the front panel HMI or the BESTCOMSPlus metering explorer.
  • Page 102 Dragging the blue square anywhere other than one of the arrow/tab boxes places the selected metering screen as a floating window. Metered Parameters DECS-250 metering categories include generator, power, bus, field, power system stabilizer (PSS), and generator synchronization parameters. Generator...
  • Page 103 A and C (Vca), and the average bus voltage. The frequency of the bus voltage is also metered. Primary- and per-unit values are available. Figure 13-5 illustrates the bus primary-values metering screen. Figure 13-5. Bus Primary-Values Metering DECS-250 Metering...
  • Page 104 PSS output level. The PSS function on/off status is also reported. Primary- and per-unit values are available. Figure 13-7 illustrates the PSS primary-values metering screen. Figure 13-7. PSS Primary-Values Metering Metering DECS-250...
  • Page 105 HMI Navigation Path: Metering Explorer, Aux Input The control signal applied at the DECS-250 auxiliary control input is indicated on the Aux Input metering screen (Figure 13-9). As configured in BESTCOMSPlus, a dc voltage or dc current signal may be applied.
  • Page 106 PF are displayed, as well as Alarm status, PSS status, Null Balance status, and Grid Code Mode. Figure 13-11. Control Panel Start/Stop Mode: Two indicators show the start/stop mode of the DECS-250. When a mode is active, its corresponding indicator changes from gray to green. To select the DECS-250 Start status, click the Start button.
  • Page 107 All of the metering values displayed on the individual, previously-described metering screens are consolidated on the metering summary screen. Primary- and per-unit values are available. Figure 13-12 illustrates the primary-values metering summary screen. The primary- and per-unit metering summary screens are available only in BESTCOMSPlus. DECS-250 Metering...
  • Page 108 9440300990 Figure 13-12. Metering Summary Screen Status Indication Status indication is provided for DECS-250 system functions, inputs, outputs, network load share, grid code, configurable protection, alarms, and the real-time clock. System Status BESTCOMSPlus Navigation Path: Metering Explorer, Status, System Status...
  • Page 109 Annunciation is also provided for the optional Analog Expansion Module (AEM-2020) inputs. DECS-250 Contact Inputs Status indication for the DECS-250’s 16 contact sensing inputs is provided on the BESTCOMSPlus contact inputs screen illustrated in Figure 13-14. An indicator changes from gray to red when a closed contact is sensed at the corresponding input.
  • Page 110 Module (AEM-2020) analog outputs. DECS-250 Contact Outputs Status indication for the DECS-250’s Watchdog and 11 contact outputs is provided on the BESTCOMSPlus contact outputs screen illustrated in Figure 13-15. An indicator changes from gray to green when the corresponding output changes state (Watchdog output) or closes (Output 1 through 11).
  • Page 111 Trip status for the eight configurable, supplemental protection elements is annunciated on the BESTCOMSPlus configurable protection screen (Figure 13-18). An indicator for each protection element’s four trip thresholds changes from gray to green when the corresponding trip threshold is exceeded. DECS-250 Metering...
  • Page 112 Reset pushbutton. A Reset Alarms button on the Alarms screen is clicked to clear all inactive alarms in BESTCOMSPlus. The BESTCOMSPlus Alarms screen is illustrated in Figure 13-19. All possible DECS-250 alarms are listed below. Figure 13-19. DECS-250 Alarm Annunciation and Reset Screen...
  • Page 113 RTD Input 4 Threshold 3 Trip Duplicate AEM RTD Input 4 Threshold 4 Trip RTD Input 5 Out of Range Duplicate CEM RTD Input 5 Threshold 1 Trip Ethernet Link Lost Exciter Open Diode RTD Input 5 Threshold 2 Trip DECS-250 Metering...
  • Page 114 Disabled, Latching, or Non-Latching. Latching alarms are stored in nonvolatile memory and are retained even when control power to the DECS-250 is lost. Active alarms are shown on the front panel LCD and in BESTCOMSPlus until they are cleared. Non-latching alarms are cleared when control power is removed.
  • Page 115 The DECS-250 time and date is displayed and adjusted on the BESTCOMSPlus Real-Time Clock screen (Figure 13-22). Manual adjustment of the DECS-250 clock is made by clicking the Edit button. This displays a window where the DECS-250 time and date can be adjusted manually or according to the connected PC clock’s date and time.
  • Page 116 Found under the Tools menu, the auto export metering function is an automated method for saving multiple metering data files at specific intervals over a period of time while connected to a DECS-250. The user specifies the Number of Exports and the Interval between each export. Enter a base filename for the metering data and a folder in which to save.

  • Page 117: Event Recorder

    HMI Navigation Path: Metering Explorer, Reports, Sequence of Events A sequence of events recorder monitors the internal and external status of the DECS-250. Events are scanned at four millisecond intervals with 1,023 events stored per record. All changes of state that occur during each scan are time- and date-stamped.
  • Page 118 Data logging may be triggered by mode triggers, logic triggers, level triggers, or manually through BESTCOMSPlus. Mode Triggers Mode triggers initiate data logging as a result of an internal or external DECS-250 status change. A data log can be triggered by any of the following status changes: Start or Stop mode selected •...
  • Page 119 • FCR output AVR output FCR state • • • AVR PID error signal input • Field current Bus frequency Field voltage • • Bus voltage Frequency response • • Comp. frequency deviation FVR error • • DECS-250 Event Recorder...
  • Page 120 Logic triggering initiates a data log as a result of an internal or external status change. A data log can be triggered by any combination of alarm, contact output, or contact input state changes. The available logic triggers are illustrated in Figure 14-5. Event Recorder DECS-250...
  • Page 121 BESTCOMSPlus Navigation Path: Settings Explorer, Report Configuration, Trending HMI Navigation Path: Settings, Configuration Settings, Trending The trend log records the activity of DECS-250 parameters over an extended period of time. When enabled, up to six selectable parameters can be monitored over a user-defined duration ranging from one to 720 hours.
  • Page 122 14-6 9440300990 Figure 14-6. Trend Log Setup Event Recorder DECS-250...

  • Page 123: Power System Stabilizer

    PSS function is illustrated by the function blocks and software switches shown in Figure 15-1. This illustration is also available in BESTCOMSPlus by clicking the PSS Model Info button located on the Control tab. DECS-250 Power System Stabilizer...
  • Page 124 15-2 9440300990 Figure 15-1. PSS Function Blocks and Software Switches Power System Stabilizer DECS-250...
  • Page 125 However, this may not be the case during low frequency transients, due to the voltage drop across the machine reactance. To compensate for this effect, the DECS-250 first calculates the terminal voltages and currents. It then adds the voltage drop across the quadrature reactance to the terminal voltages to obtain internal machine voltages.
  • Page 126 SSW 2 setting is Frequency and the SSW 3 setting is Derived Frequency/Speed. Washed out power is selected as the stabilizing signal when the SSW 3 setting is Power. (When the SSW 3 setting is Power, the SSW 2 setting has no effect.) Power System Stabilizer DECS-250...
  • Page 127 The output of the phase compensation stages is connected, through a stabilizer gain stage, to the washout filter and logic limiter. Software switch SSW 9 enables and bypasses the washout filter and logic limiter. The washout filter has two time constants: normal and limit (less than normal). DECS-250 Power System Stabilizer...
  • Page 128 Since the PSS operates by modulating the excitation, it may counteract the voltage regulator’s attempts to maintain terminal voltage within a tolerance band. To avoid creating an overvoltage condition, the PSS has a terminal voltage limiter (shown in Figure 15-8) that reduces the upper output limit to zero when the Power System Stabilizer DECS-250...
  • Page 129 The low-pass filter is controlled by a time constant. Figure 15-10. PSS Configuration Settings Figure 15-11. PSS Control Settings DECS-250 Power System Stabilizer...
  • Page 130 15-8 9440300990 Figure 15-12. PSS Parameter Settings Power System Stabilizer DECS-250...
  • Page 131 9440300990 15-9 Figure 15-13. PSS Output Limiter Settings DECS-250 Power System Stabilizer...
  • Page 132 15-10 9440300990 Power System Stabilizer DECS-250...

  • Page 133: Stability Tuning

    Proportional, Integral, Derivative. The word proportional indicates that the response of the DECS-250 output is proportional or relative to the amount of difference observed. Integral means that the DECS-250 output is proportional to the amount of time that a difference is observed. Integral action eliminates offset.
  • Page 134 Upon completion of stability tuning, undesired records can be removed from the record list. Caution Calculated or user-defined PID values are to be implemented only after their suitability for the application has been verified by the user. Incorrect PID numbers can result in poor system performance or equipment damage. Stability Tuning DECS-250...
  • Page 135 PID values calculated by the Auto Tuning function are to be implemented only after their suitability for the application has been verified by the user. Incorrect PID numbers can result in poor system performance or equipment damage. DECS-250 Stability Tuning...
  • Page 136 BESTCOMSPlus FCR stability settings and FVR stability settings are illustrated in Figure 16-4. FCR Mode Stability Settings The DECS-250 bases its field current output upon the following settings. The proportional gain (K ) is multiplied by the error between the field current setpoint and the actual field current value.
  • Page 137 HMI Navigation Path: Settings, Operating Settings, Gains, Other Gains Settings for stability tuning of the Var and Power Factor modes are provided in the DECS-250 along with settings for stability tuning of limiters, the voltage matching function, and main field voltage response.
  • Page 138 ) adjusts the coarse loop-gain level of the PID algorithm for the reactive power limiter function. Voltage Matching The integral gain (K ) adjusts the rate at which the DECS-250 matches the generator voltage to the bus voltage. Figure 16-5. Other Mode and Function Gain Settings Stability Tuning...

  • Page 139: Mounting

    17-1 17 • Mounting As delivered, the DECS-250 is configured for projection (wall) mounting. Front panel mounting is possible with an optional escutcheon kit. Kits are supplied with an escutcheon and screws for securing the escutcheon to the DECS-250. Request part number 9440311101. This kit is suitable for new installations and when replacing a DECS-200 with the DECS-250.
  • Page 140 17-2 9440300990 Figure 17-1. Overall and Projection Mounting Dimensions Mounting DECS-250...
  • Page 141 9440300990 17-3 Figure 17-2. DECS-250 Escutcheon Plate Dimensions DECS-250 Mounting...
  • Page 142 17-4 9440300990 Figure 17-3. Panel Cutting and Drilling Dimensions for DECS-250 Panel Mounting Mounting DECS-250...

  • Page 143: Terminals And Connectors

    18-1 18 • Terminals and Connectors DECS-250 terminals and connectors are located on the left side panel, front panel, and right side panel. DECS-250 terminals consist of single-row, multiple-pin headers that mate with removable connectors wired by the user. DECS-250 connectors vary according to their function and the specified options.
  • Page 144 RLY 5 RLY 6 IN 13 RLY 6 RLY 7 IN 14 RLY 7 RLY 8 RLY 8 RLY 9 RLY 9 RLY 10 RLY 10 RLY 11 RLY 11 Figure 18-1. Left Side Panel Terminals Terminals and Connectors DECS-250...
  • Page 145 Description These terminals accept three-phase operating power for the excitation power stage of the DECS-250. A ground for the operating power connections is provided at terminal GND. Excitation power is supplied to the field through the terminals labeled F+ and F–.
  • Page 146 18-4 9440300990 IRIG -- - IRIG Figure 18-2. Right Side Connectors and Terminals Terminals and Connectors DECS-250...
  • Page 147 (not shown). Terminal Types Spring terminals are supplied on DECS-250 controllers with a style number of xxxSxxx. These removable connectors secure each wire with a spring-loaded contact. Compression terminals are supplied for the operating power terminals (locator A), field power output terminals (locator B), and current sensing terminals (locator C) when a style number of xxxCxxx is specified.
  • Page 148 Spring terminal connector blocks identified by locators A through J and M are held in place by retaining clips. Connectors identified by locators A, B, E, F, G, H, I, and J are keyed to avoid misconnections. Terminals and Connectors DECS-250...

  • Page 149: Typical Connections

    19-1 19 • Typical Connections Typical connection diagrams are provided in this chapter as a guide when wiring the DECS-250 for communication, contact inputs, contact outputs, sensing, and operating power. Typical connections for shunt powered applications are shown in Figure 19-1. Typical connections for PMG powered applications are shown in Figure 19-2.
  • Page 150 19-2 9440300990 Figure 19-1. Typical DECS-250 Connections for Shunt Powered Applications Typical Connections DECS-250...
  • Page 151 9440300990 19-3 Figure 19-2. Typical DECS-250 Connections for PMG Powered Applications DECS-250 Typical Connections...
  • Page 152 19-4 9440300990 Figure 19-3. Typical DECS-250 Connections for Station Powered Applications Typical Connections DECS-250...

  • Page 153: Bestcomsplus ® Software

    DECS-250 is brought into BESTCOMSPlus by downloading settings and logic from the DECS-250. This gives the user the option of developing a custom setting file by modifying the default logic scheme or by building a unique scheme from scratch.
  • Page 154 BESTCOMSPlus. Manual activation is useful if you want to create a settings file prior to receiving your digital excitation system. Note that if a DECS-250 is not connected, you will not be able to configure certain Ethernet settings. Ethernet settings can be changed only when an active USB or Ethernet connection is present.
  • Page 155 If the USB driver does not install properly, refer to the Maintenance chapter for a troubleshooting procedure. Connect a USB cable between the PC and your DECS-250. Apply operating power (per style chart in the Introduction chapter) to the DECS-250 at rear terminals A, B, and C. Wait until the boot sequence is complete.
  • Page 156 The BESTCOMSPlus platform window opens. Select New Connection from the Communication pull- ® down menu and select DECS-250. See Figure 20-4. The DECS-250 plugin is activated automatically after connecting to a DECS-250. Figure 20-4. Communication Pull-Down Menu The DECS-250 Connection screen shown in Figure 20-5 appears. Select USB Connection and click Connect.
  • Page 157 Manual activation of the DECS-250 plugin is required only if your initial use of BESTCOMSPlus will be ® on a PC that is not connected to a DECS-250. Manual activation is described in the following paragraphs. Requesting an Activation Key When initially running the DECS-250 plugin, the Activate Device Plugin pop-up appears. You must contact Basler Electric for an activation key before you can activate the DECS-250 plugin.
  • Page 158 Select DECS-250 from the Device pull-down menu. Enter your Email Address and Activation Key provided by Basler Electric. If you received an email containing the Activation Key, you can select all of the text in the email and copy it to the Windows clipboard using normal Windows techniques. The Get Data button extracts the Device, Email Address, and Activation Key from the Windows clipboard and pastes it into the appropriate fields.
  • Page 159 Recent Files Open a previously opened file Exit Close BESTCOMSPlus program Communication New Connection Choose new device or DECS-250 Close Connection Close communication between BESTCOMSPlus and DECS-250 Download Settings and Logic from Device Download operational and logic settings from the device...
  • Page 160 DECS-250. Settings Explorer The Settings Explorer is a convenient tool within BESTCOMSPlus used to navigate through the various ® settings screens of the DECS-250 plugin. Descriptions of these configuration settings are organized as follows: General Settings • •...
  • Page 161 Right-clicking the hyperlinked setting name will restore the setting to its default value. Note It is possible to save a DECS-250 settings file in BESTCOMSPlus with noncompliant settings. However, it is not possible to upload noncompliant settings to the DECS-250.
  • Page 162 Upload Settings and/or Logic to Device To upload a settings file to the DECS-250, open the file or create a new file through BESTCOMSPlus. Then pull down the Communication menu and select Upload Settings and Logic to Device. If you want to upload operational settings without logic, select Upload Settings to Device.
  • Page 163 Compare dialog box (Figure 20-9) is displayed where you can view all settings (Show All Settings), view only the differences (Show Settings Differences), view all logic (Show All Logic Paths), or view only logic differences (Show Logic Path Differences). Select Close when finished. Figure 20-9. BESTCOMSPlus Settings Compare ® DECS-250 BESTCOMSPlus ® Software...
  • Page 164 Figure 20-10. Auto Export Metering Screen Firmware Updates Future enhancements to the DECS-250 functionality may require a firmware update. Because default settings are loaded when DECS-250 firmware is updated, your settings should be saved in a file prior to upgrading firmware. Warning! Before performing any maintenance procedures, remove the DECS- 250 from service.
  • Page 165 2020), and the optional Analog Expansion Module (AEM-2020). Embedded firmware is the operating program that controls the actions of the DECS-250. The DECS-250 stores firmware in nonvolatile flash memory that can be reprogrammed through the communication ports. It is not necessary to replace EPROM chips when updating the firmware with a newer version.
  • Page 166 Uploader screen and disconnect communication to the DECS-250. Upgrading Firmware in the DECS-250 The following procedure is used to upgrade firmware in the DECS-250. This must be completed after upgrading firmware in any expansion modules. Remove the DECS-250 from service. Refer to the appropriate site schematics to ensure that all steps have been taken to properly and completely de-energize the DECS-250.
  • Page 167 General Settings > Style Number in BESTCOMSPlus. If the style number of the settings file does not match that of the DECS-250 into which it is to be loaded, disconnect from the DECS-250, then modify the style number in the settings file.
  • Page 168 20-16 9440300990 BESTCOMSPlus ® Software DECS-250...

  • Page 169: Bestlogic™Plus

    ® a file and upload it to the DECS-250. The default logic schemes can also be customized to suit your application. Detailed information about logic schemes is provided later in this chapter.
  • Page 170 Front Panel Buttons Down Button True while the front panel Down arrow button is pressed. Edit Button True while the front panel Edit button is pressed. Left Button True while the front panel Left arrow button is pressed. BESTlogic™Plus DECS-250...
  • Page 171 True when the Active Power PI controller is at either its maximum or minimum output limit. APC Remote True while the Remote Control Failure Timer is Comm Active active. The Remote Control Failure Timer is always active and resets frequently, during good communications. DECS-250 BESTlogic™Plus...
  • Page 172 Continuous Operation region for Grid Code Connectivity (GCC). GCC Disabled True when the GCC function is disabled. GCC Disconnect True when any Grid Code disconnection timer has Timed Out expired. Remains true until the GCC reconnect timer becomes active. BESTlogic™Plus DECS-250...
  • Page 173 True when this option is selected. (Governor Bias Type Proportional Control Settings screen) Grid Code True when overall Grid Code functionality is Enabled enabled. KW Threshold True when kW output is below the standard (non- Grid Code) PF Active Power Level. DECS-250 BESTlogic™Plus...
  • Page 174 True when LVRT remote communication has failed. Failmode Internal Tracking True when internal tracking is running. Active IRIG Sync Lost True when IRIG signal is not being received. Manual Mode True when the unit is in Manual mode (FCR/FVR). Active BESTlogic™Plus DECS-250...
  • Page 175 PSS Current True when the phase current is unbalanced and Unbalanced the PSS is active. (Optional) PSS Power True when the input power is below the Power Below Threshold Level threshold and the PSS is active. (Optional) DECS-250 BESTlogic™Plus...
  • Page 176 Version VAR Controller True when the unit is in VAR mode. Active VAR Limiter True when the Var Limiter is active. Active Voltage Matching True when Voltage Matching is active. Active BESTlogic™Plus DECS-250...
  • Page 177 Inputs, see the Analog Expansion Module chapter in this manual. The pickup block is true when the threshold is exceeded. The trip block is true when the corresponding pickup block threshold is exceeded for the duration of the time delay. DECS-250 BESTlogic™Plus...
  • Page 178 Remote Thermocouple Inputs, Out of Range 1-2 Output Objects Physical Outputs Physical Outputs 1 through 11. OUT1 - OUT11 Remote Outputs Remote Outputs 12 through 35. OUT12 - OUT35 (Available when an optional CEM-2020 is connected.) BESTlogic™Plus DECS-250...
  • Page 179 This group contains Logic Gates, Pickup and Dropout Timers, Latches, and Comment Blocks. Table 21-2 lists the names and descriptions of the objects in the Components group. Table 21-2. Components Group, Names and Descriptions Name Description Symbol Logic Gates Input Output NAND Input Output Input Output Input Output DECS-250 BESTlogic™Plus...
  • Page 180 SET (ON) state. When the Reset input is on and the Set input is off, the latch will go to the RESET (OFF) state. If both the Set and Reset inputs are on at the same time, a set priority latch will go to the SET (ON) state. BESTlogic™Plus DECS-250...
  • Page 181 When true, this element disables APC Bridge DISABLE mode. APC DISABLE When true, this element disables Grid Code APC mode. ALARM RESET When true, this element resets all active alarms. AUTO ENABLE When true, this element sets the unit in Auto mode (AVR). DECS-250 BESTlogic™Plus...
  • Page 182 FREEZE LVRT When true, the output of the LVRT controller OUTPUT is frozen. This can be used with the LVRT REMOTE COMM FAIL status input to freeze LVRT output when remote communication fails. BESTlogic™Plus DECS-250...
  • Page 183 Open: This output is pulsed TRUE (closes the output contact it is contact input is closed, the breaker is mapped to) when the DECS-250 is providing a signal to the indicated to be closed. When the contact breaker to open. It will be a pulse if the Breaker Output Contact...
  • Page 184 DISABLE units on the network to be disabled. When an input to this block is true, load share data received from that unit is ignored by the DECS-250. LOSS OF SENSING When true, this element disables the Loss of DISABLE Sensing function.
  • Page 185 52JK is closed. PREPOSITION 1 When true, this element informs the unit to ENABLE use setpoints for Preposition 1. PREPOSITION 2 When true, this element informs the unit to ENABLE use setpoints for Preposition 2. DECS-250 BESTlogic™Plus...
  • Page 186 LVRT Remote Communications Failure as indicated below: • When true, the LVRT Remote Control Failure Mode is set to Hold Output. • When false, the LVRT Remote Control Failure Mode is set to Q(PF). BESTlogic™Plus DECS-250...
  • Page 187 ALARM 1 - 16 VAR LIMITER When true, this element selects the SELECT secondary settings on the Var limiter. SECONDARY SETTINGS VAR/PF MODE The var input selects var control and the PF input selects power factor control. DECS-250 BESTlogic™Plus...
  • Page 188 The Active Logic Scheme The DECS-250 must have an active logic scheme in order to function. All DECS-250 controllers are delivered with a default, active logic scheme preloaded in memory. The functionality of this logic scheme is similar to the scheme provided with the DECS-200. If the function block configuration and output logic of the default logic scheme meet the requirements of your application, then only the operating settings (system parameters and threshold settings) need to be adjusted before placing the DECS-250 in service.
  • Page 189 Modifying a logic scheme in BESTCOMSPlus ® make that scheme active in the DECS-250. The modified scheme must be uploaded into the DECS-250. See the paragraphs on Sending and Retrieving Logic Schemes above. Default Logic Schemes The default logic scheme for PSS-disabled systems is shown in Figure 21-2 through Figure 21-4 and the default logic scheme for PSS-enabled systems is shown in Figure 21-5 through Figure 21-8.
  • Page 190 21-22 9440300990 Figure 21-3. PSS-Disabled Default Logic - Logic Page 2 Tab Figure 21-4. PSS-Disabled Default Logic - Physical Outputs Tab BESTlogic™Plus DECS-250...
  • Page 191 9440300990 21-23 Figure 21-5. PSS-Enabled Default Logic - Logic Page 1 Tab Figure 21-6. PSS-Enabled Default Logic - Logic Page 2 Tab DECS-250 BESTlogic™Plus...
  • Page 192 Use BESTCOMSPlus to program BESTlogicPlus. Using BESTlogicPlus is analogous to physically ® attaching wire between discrete DECS-250 terminals. To program BESTlogicPlus, use the Settings Explorer within BESTCOMSPlus to open the BESTlogicPlus Programmable Logic tree branch as shown in Figure 21-1.
  • Page 193 A red X indicates that an object or element is not available per the style number of the DECS-250. The view of the Main Logic and Physical Outputs can be automatically arranged by clicking the right mouse button on the window and selecting Auto-Layout.
  • Page 194 To manage BESTlogicPlus files, use the Settings Explorer to open the BESTlogicPlus Programmable Logic tree branch. Use the BESTlogicPlus Programmable Logic toolbar to manage BESTlogicPlus files. Refer to Figure 21-11. For information on Settings Files management, refer to the BESTCOMSPlus Software chapter. BESTlogic™Plus DECS-250...
  • Page 195 Logic Document from the Protection drop-down button. Establishing a password is optional. Uploading a BESTlogicPlus File To upload a BESTlogicPlus file to the DECS-250, you must first open the file through BESTCOMSPlus or create the file using BESTCOMSPlus. Then pull down the Communication menu and select Upload Logic.
  • Page 196 Example 2 - AND Gate Connections Figure 21-13 illustrates a typical AND gate connection. In this example, Output 11 will become active when the bus and the generator are dead. Figure 21-13. Example 2 - AND Gate Connections BESTlogic™Plus DECS-250...

  • Page 197: Communication

    All DECS controllers mentioned here use a female DB-9 (RS-232) connector for communication with a second DECS. On the DECS-250, this connector is located on the right side panel and is illustrated in the Terminals and Connectors chapter of this manual. A five-foot (1.5 meter) cable, part number 9310300032, is available for interconnecting two DECS controllers.
  • Page 198 BESTCOMSPlus Navigation Path: Settings Explorer, Communications, Modbus Setup HMI Navigation Path: Not available through HMI. DECS-250 systems support the RS-485 mode and Modbus TCP (Ethernet) mode at the same time. DECS-250 Modbus communication registers are listed and defined in the Modbus Communication chapter of this manual.
  • Page 199 BESTCOMSPlus Navigation Path: Settings Explorer, Communications, CAN Bus, CAN Bus Setup HMI Navigation Path: Settings, Communications, CAN Bus, CAN Bus Setup One CAN (controller area network) interface (CAN 1) facilitates communication between the DECS-250 and optional modules such as the contact expansion module (CEM-2020) and analog expansion module (AEM-2020).
  • Page 200 The Allowed Command Address is the J1939 address from which the DECS-250 will accept broadcast data. If the address is set to 255 or the same as the DECS-250 CAN Bus Interface address, then broadcast data is accepted from any address. Otherwise, broadcast data is accepted from only the specified address.
  • Page 201 The DECS-250 Connection window appears. (Figure 22-7) If you know the IP address of the DECS-250, click the radio button for the Ethernet Connection IP at the top of the DECS-250 Connection window, enter the address into the fields and click the Connect button.
  • Page 202 22-6 9440300990 Figure 22-7. DECS-250 Connection Window Figure 22-8. Scanning for Connected Devices Figure 22-9. Device Discovery Window Communication DECS-250...
  • Page 203 BESTCOMSPlus Navigation Path: Settings Explorer, Communications, Profibus Setup HMI Navigation Path: Settings, Communications, Profibus On units equipped with the PROFIBUS communication protocol (style xxxxxxP), the DECS-250 sends and receives PROFIBUS data through a DB-9 port located on the right side panel. DECS-250 PROFIBUS DECS-250 Communication...
  • Page 204 22-8 9440300990 communication parameters are listed and defined in the PROFIBUS Communication chapter of this manual. DB-9 port communication settings are illustrated in Figure 22-11 and consist of the address and network byte order. Figure 22-11. Profibus Setup Communication DECS-250...

  • Page 205: Configuration

    The nominal operating power input voltage is used to calculate the recommended Ka (Loop Gain) value. This value is also used in metering calculations. When using the DECS-250 with an exciter requiring an inverted output, check this box to enable the inverting of the DECS-250 control output.
  • Page 206 Figure 23-1. Generator, Bus, Field, and Pole Ratio Ratings Bridge A Power Input Configuration setting establishes the DECS-250 operating power configuration. All other settings on this screen are disabled and used only by the DECS-250N Digital Excitation Control System. Figure 23-2. Power Input Configuration...
  • Page 207 Generator CTs Current settings for the generator CT primary and secondary windings establish the nominal CT current values expected by the DECS-250. DECS-250 sensing current can be obtained from a single phase or all three generator phases. Bus PT Voltage settings for the bus PT primary and secondary windings establish the nominal bus PT voltages expected by the DECS-250.
  • Page 208 Startup Functions BESTCOMSPlus Navigation Path: Settings Explorer, Operating Settings, Startup HMI Navigation Path: Settings, Operating Settings, Startup DECS-250 startup functions consist of soft start and field flashing. These settings are illustrated in Figure 23-4. Soft Start During startup, the soft start function prevents voltage overshoot by controlling the rate of generator terminal voltage buildup (toward the setpoint).
  • Page 209 DECS-250. Product Information Product information for the DECS-250, CEM-2020, and AEM-2020 includes the device model number and serial number. Device Identification The user-assigned Device ID can be used to identify DECS-250 controllers in reports and during polling. DECS-250 Configuration...
  • Page 210 BESTCOMSPlus Navigation Path: General Settings, Display Units HMI Navigation Path: N/A When working with DECS-250 settings in BESTCOMSPlus, you have the option of viewing the settings in English or Metric units. The display units setting is illustrated in Figure 23-6 and is not available for settings shown on the front panel display.

  • Page 211: Security

    24-1 24 • Security DECS-250 security is provided in the form of passwords which control the type of operations allowed by a particular user. Passwords can be tailored to provide access to specific operations. Additional security is available by controlling the type of operations allowed through certain DECS-250 communication ports.
  • Page 212 An additional dimension of security is provided by the ability to restrict the control available through the DECS-250 communication ports. At any given time, only one port can be in use with read or higher access. For example, if a user gains settings access at one port, users at other ports will be able to gain no higher than read access until the user with settings access logs off.
  • Page 213 A login attempts setting limits the number of times that login can be attempted. A login time window limits the length of time permitted during the login process. If login is unsuccessful, access is blocked for the duration of the login lockout time setting. Figure 24-3. Login and Access Control Settings DECS-250 Security...
  • Page 214 24-4 9440300990 Security DECS-250...

  • Page 215: Timekeeping

    HMI Navigation Path: Settings, General Settings, Clock Setup Time and Date Format Clock display settings enable you to configure the time and date reported by the DECS-250 to match the conventions used in your organization/facility. The reported time can be configured for either the 12- or 24-hour format with the Time Format setting.
  • Page 216 The Time Priority Setup must be used to enable a connected time source. When multiple, time sources are connected, the Time Priority Setup can be used to rank the sources according to their priority. Figure 25-1. Clock Setup Timekeeping DECS-250...

  • Page 217: Testing

    9440300990 26-1 26 • Testing Testing of the DECS-250’s regulation and optional power system stabilizer (style XPXXXXX) performance is possible through the integrated analysis tools of BESTCOMSPlus ® Real-Time Metering Analysis BESTCOMSPlus Navigation Path: Metering Explorer, Analysis HMI Navigation Path: Analysis functions are not available through front panel HMI.
  • Page 218 • Mechanical power (x8) Var/PF state • Mechanical power (x9) • Var/PF output • • Negative sequence current (I2) Washed out power (WashP) • Negative sequence voltage (V2) • Washed out speed (WashW) • • Network Load Share Testing DECS-250...
  • Page 219 A Bode plot can be printed, opened, and saved in graph (.gph) format. Transfer Function The point in the DECS-250 logic circuitry where a signal is injected for analysis of magnitude and phase responses is selectable. Signal points include PSS Comp Frequency, PSS Electric Power, AVR Summing, AVR PID Input, and Manual PID Input.
  • Page 220 Tests should be performed at various load levels to confirm that the input signals are calculated or measured correctly. Since the PSS function uses compensated terminal frequency in place of speed, the derived mechanical power signal should be examined carefully to ensure that it does not contain any Testing DECS-250...
  • Page 221 Swept Sine Test Signals Swept Sine test signals employ a unique set of characteristics that include the sweep style, frequency step, and start/stop frequencies. Sweep Type A Swept Sine test signal can be configured as linear or logarithmic. DECS-250 Testing...
  • Page 222 If logging is in progress, another log cannot be triggered. Response characteristics displayed on the Step Response Analysis screen are not automatically updated when the DECS-250 operating mode is switched externally. The screen must be manually updated by exiting and then reopening the screen.
  • Page 223 Options are provided to adjust graph history and poll rate. Graph height sets the displayed graphs to a fixed height in pixels. When the Auto Size box is checked, all displayed graphs are automatically sized to equally fit the available space. History length is selectable from 1 to 30 minutes. Poll rate is adjustable DECS-250 Testing...
  • Page 224 Place a check in the Sync Graph Scrolling box to sync scrolling between all graphs when any horizontal scroll bar is moved. See Figure 26-7. Figure 26-6. Analysis Options Screen, Layout Tab Figure 26-7. Analysis Options Screen, Graph Display Tab Testing DECS-250...

  • Page 225: Can Communication

    Contact Expansion Module and Analog Expansion Module for more information. CAN Bus interface 2 enables the DECS-250 to provide generator and system parameters to a generator controller such as the Basler DGC-2020. CAN 2 also permits DECS-250 setpoint and mode control from an external device connected to the CAN.
  • Page 226 100 ms Byte 0, Bits 0-2 Notes 1 = FCR 2 = AVR 3 = VAR 4 = PF 5 = FVR Will not override if held by logic. Byte 0, Bits 3–7 unused Bytes 1–7 unused CAN Communication DECS-250...
  • Page 227 (AVR Setpoint) Diagnostic Trouble Codes (DTCs) The DECS-250 will send an unsolicited message of a currently active diagnostic trouble code (DTC). Previously active DTCs are available upon request. Active and previously active DTCs can be cleared on request. Table 27-2 lists the diagnostic information that the DECS-250 obtains over the CAN Bus interface.
  • Page 228 0x11 (17) * 0 = Data valid but above normal range, most severe. 14 = Special instructions. 15 = Data valid but above normal range, least severe. 17 = Data valid but below normal range, least severe. CAN Communication DECS-250...

  • Page 229: Modbus® Communication

    Modbus communications use a master-slave technique in which only the master can initiate a transaction. This transaction is called a query. When appropriate, a slave (DECS-250) responds to the query. When a Modbus master communicates with a slave, information is provided or requested by the master.
  • Page 230 (MSB) of the field to 1 if the response is an error response. This field is 1 byte in length. The DECS-250 maps all available data into the Modicon 984 holding register address space supports the following function codes: Function 03 (03 hex) - read holding registers •...
  • Page 231 3.5 character times before considering the message complete. Once a valid query is received, the DECS-250 waits a specified amount of time before responding. This time delay is set on the Modbus Setup screen under Communications in BESTCOMSPlus .
  • Page 232 Note: All Modbus TCP ADU are sent via TCP on registered port 502. Error Handling and Exception Responses Any query received that contains a non-existent device address, a framing error, or CRC error is ignored. No response is transmitted. Queries addressed to the DECS-250 with an unsupported function or illegal Modbus ®...
  • Page 233 DECS-250 Modbus ® via Ethernet Modbus can communicate through Ethernet if the IP address of the DECS-250 is configured as described in the Communications chapter of this manual. Detailed Message Query and Response for RTU Transmission Mode A detailed description of DECS-250 supported message queries and responses is provided in the following paragraphs.
  • Page 234 If the query is a broadcast (device address = 0), no response message is returned. If the DECS-250 receives this query while in the listen only mode, no response message is generated. Otherwise, a response message identical to the query message is transmitted prior to the communications restart.
  • Page 235 Data Block byte count and data. The DECS-250 will perform the write when the device address in query is a broadcast address or the same as the DECS-250 Modbus Unit ID (device address).
  • Page 236 CRC Lo error check Response The response message echoes the Query message after the register has been altered. Data Formats DECS-250 systems support the following data types: Data types mapped to 2 registers • Unsigned Integer 32 (Uint32) Floating Point (Float)
  • Page 237 The Modbus string data format uses one or more holding registers to represent a sequence, or string, of character values. If the string contains a single character, the holding register high byte will contain the ASCII character code and the low byte will be zero. DECS-250 Modbus ®...
  • Page 238 This field contains a two-byte CRC value for transmission error detection. The master first calculates the CRC and appends it to the query message. The DECS-250 system recalculates the CRC value for the received query and performs a comparison to the query CRC value to determine if a transmission error has occurred.
  • Page 239 40900 bit 8 Uint16 True=1 False=0 Alarms Ethernet link lost alarm 40900 bit 9 Uint16 True=1 False=0 Alarms USB com alarm 40900 bit 10 Uint16 True=1 False=0 Alarms IRIG sync lost alarm 40900 bit 11 Uint16 True=1 False=0 DECS-250 Modbus ® Communication...
  • Page 240 Exciter Diode Monitor Block open diode 40903 bit 12 Uint16 True=1 False=0 Exciter Diode Monitor Pickup open diode 40903 bit 13 Uint16 True=1 False=0 Exciter Diode Monitor Trip open diode 40903 bit 14 Uint16 True=1 False=0 Modbus ® Communication DECS-250...
  • Page 241 Configurable Protection Threshold 4 Trip 40906 bit 15 Uint16 True=1 False=0 Configurable Protection 3 Configurable Protection Threshold 1 Pickup 40907 bit 0 Uint16 True=1 False=0 Configurable Protection 3 Configurable Protection Threshold 1 Trip 40907 bit 1 Uint16 True=1 False=0 DECS-250 Modbus ® Communication...
  • Page 242 True=1 False=0 Network Load Share Unknown Network Load Share Protocol 40910 bit 1 Uint16 True=1 False=0 Version Alarms Voltage Matching Active 40910 bit 2 Uint16 True=1 False=0 Contact Inputs Start Input 40910 bit 3 Uint16 True=1 False=0 Modbus ® Communication DECS-250...
  • Page 243 Uint16 True=1 False=0 DECS Control Var Limiter Select Group 2 40913 bit 4 Uint16 True=1 False=0 DECS Control Var Active 40913 bit 5 Uint16 True=1 False=0 DECS Control PF Active 40913 bit 6 Uint16 True=1 False=0 DECS-250 Modbus ® Communication...
  • Page 244 True=1 False=0 AEM Configuration AEM Communication Failure 40916 bit 7 Uint16 True=1 False=0 AEM Configuration Duplicate AEM 40916 bit 8 Uint16 True=1 False=0 AEM Configuration AEM Input 1 Out of Range 40916 bit 9 Uint16 True=1 False=0 Modbus ® Communication DECS-250...
  • Page 245 AEM Protection 4 Threshold 3 Trip 40919 bit 10 Uint16 True=1 False=0 AEM Protection 4 Threshold 4 Pickup 40919 bit 11 Uint16 True=1 False=0 AEM Protection 4 Threshold 4 Trip 40919 bit 12 Uint16 True=1 False=0 DECS-250 Modbus ® Communication...
  • Page 246 RTD Protection 3 Threshold 1 Pickup 40922 bit 13 Uint16 True=1 False=0 RTD Protection 3 Threshold 1 Trip 40922 bit 14 Uint16 True=1 False=0 RTD Protection 3 Threshold 2 Pickup 40922 bit 15 Uint16 True=1 False=0 Modbus ® Communication DECS-250...
  • Page 247 Thermocouple Protection 1 Threshold 2 Trip 40926 bit 0 Uint16 True=1 False=0 Thermocouple Protection 1 Threshold 3 Pickup 40926 bit 1 Uint16 True=1 False=0 Thermocouple Protection 1 Threshold 3 Trip 40926 bit 2 Uint16 True=1 False=0 DECS-250 Modbus ® Communication...
  • Page 248 40929 bit 1 Uint16 True=1 False=0 Network Load Share NLS Status 3 40929 bit 2 Uint16 True=1 False=0 Network Load Share NLS Status 4 40929 bit 3 Uint16 True=1 False=0 Reserved 40929 bit 4 Reserved 40929 bit 5 Modbus ® Communication DECS-250...
  • Page 249 DECS PSS Meter Compensated Frequency 41006 Float Percent Deviation DECS PSS Meter PSS output 41008 Float DECS Regulator Meter Tracking error 41010 Float Percent DECS Regulator Meter Control output PU 41012 Float Per Unit -10 – 10 DECS-250 Modbus ® Communication...
  • Page 250 Bus Voltage Meter 41146 String 0–24 Magnitude Angle 1 Bus Voltage Meter 41158 String 0–24 Magnitude Angle 1 Bus Voltage Meter Primary 41170 String 0–24 Angle 1 Bus Voltage Meter Primary 41182 String 0–24 Angle 1 Modbus ® Communication DECS-250...
  • Page 251 Negative varhour total 41326 Float Varhour 0.00E+00– 1.00E+09 Power Meter VA hour total 41328 Float Varhour 0.00E+00– 1.00E+09 Energy Meter Positive watthour total 41330 Float Watthour 0.00E+00– 1.00E+09 Energy Meter Positive varhour total 41332 Float Varhour 0.00E+00– 1.00E+09 DECS-250 Modbus ® Communication...
  • Page 252 Per Unit Meter Vbc Pickup 41418 Float Per Unit -10 – 10 Per Unit Meter Vca Pickup 41420 Float Per Unit -10 – 10 Per Unit Meter V Average Pickup 41422 Float Per Unit -10 – 10 Modbus ® Communication DECS-250...
  • Page 253 AEM Metering Thermocouple 1 Raw Value 41512 Float Millivolt AEM Metering Thermocouple 2 Raw Value 41514 Float Millivolt AEM Metering Analog Output 1 Raw Value 41516 Float AEM Metering Analog Output 2 Raw Value 41518 Float DECS-250 Modbus ® Communication...
  • Page 254 0–600 Grid Code APC Integrator State 41588 Float Per Unit -10 – 10 Grid Code APC Error 41590 Float Per Unit -10 – 10 Grid Code APC P Desired 41592 Float Per Unit -10 – 10 Modbus ® Communication DECS-250...
  • Page 255 Second 0–120 OEL Secondary Current Hi Off 41742 Float 0–40 OEL Secondary Current Lo Off 41744 Float 0–20 OEL Secondary Current Time Off 41746 Float Second 0–10 OEL Secondary Takeover Current Max Off 41748 Float 0–40 DECS-250 Modbus ® Communication...
  • Page 256 0–1.5 • Rated kVA UEL Secondary Curve X2 41812 Float kilowatt 0–1.5 • Rated kVA UEL Secondary Curve X3 41814 Float kilowatt 0–1.5 • Rated kVA UEL Secondary Curve X4 41816 Float kilowatt 0–1.5 • Rated kVA Modbus ® Communication DECS-250...
  • Page 257 0.01–100 Coefficient On OEL Primary Takeover Reset Type Off 41880 Uint32 Inverse=0 Integrating=1 Instantaneous=2 OEL Primary Takeover Reset Type On 41882 Uint32 Inverse=0 Integrating=1 Instantaneous=2 OEL Secondary Takeover Reset Type Off 41884 Uint32 Inverse=0 Integrating=1 Instantaneous=2 DECS-250 Modbus ® Communication...
  • Page 258 Generator PF Minimum Setpoint Limit 42260 Float Power Factor 0.5–1 Generator PF Maximum Setpoint Limit 42262 Float Power Factor -1 – -0.5 FVR Setpoint 42264 Float Volt Setpoint adjustment range determined by registers 42276 and 42278. Modbus ® Communication DECS-250...
  • Page 259 Transient Boost, Minimum Fault 42322 Float Second 0–1 Duration Transient Boost, Voltage Setpoint 42324 Float Percent 0–100 Boosting Level Transient Boost, Clearing Voltage 42326 Float Percent 0–50 Threshold Transient Boost, Clearing Voltage Delay 42328 Float Second 0–1 DECS-250 Modbus ® Communication...
  • Page 260 Load Share Enable 42478 Uint32 Disabled=0 Enabled=1 Network Load Share Load Share Droop Percent 42480 Float 0–30 Network Load Share Load Share Gain 42482 Float 0–1000 Reserved 42484-87 Generator Current Configuration Rotation 42488 Uint32 Forward=0 Reverse=1 Modbus ® Communication DECS-250...
  • Page 261 System Input COM Port PF var Enabled 42644 Uint32 Off=0 PF=1 Var=2 DECS Control System Input COM Port External Tracking 42646 Uint32 Disabled=0 Enabled=1 Enabled DECS Control System Input COM Port Pre-position 42648 Uint32 NOT SET=0 SET=1 Enabled DECS-250 Modbus ® Communication...
  • Page 262 Float Disabled=0, 1–10 Monitor Power Input Failure Mode 43140 Uint32 Disabled=0 Enabled=1 Power Input Failure Time Delay 43142 Float 0–10 Loss Of Sensing Mode 43144 Uint32 Disabled=0 Enabled=1 Loss Of Sensing Time Delay 43146 Float 0–30 Modbus ® Communication DECS-250...
  • Page 263 Float Disabled=0, 0–150 Secondary Time Delay 43240 Float Instantaneous=0, 0–300000 Primary Mode 43242 Uint32 Disabled=0 Enabled=4 Primary Pickup 43244 Float Disabled=0, 0–150 Primary Time Delay 43246 Float Instantaneous =0, 0–300000 Secondary Mode 43248 Uint32 Disabled=0 Enabled=4 DECS-250 Modbus ® Communication...
  • Page 264 AVR Kd Primary 43808 Float 0–1000 AVR Td Primary 43810 Float 0–1 FCR Kp 43812 Float 0–1000 FCR Ki 43814 Float 0–1000 FCR Kd 43816 Float 0–1000 FCR Td 43818 Float 0–1 FVR Kp 43820 Float 0–1000 Modbus ® Communication DECS-250...
  • Page 265 Per Unit -0.4 – 0.4 Q Limit Q Point 3 44834 Float Per Unit -0.4 – 0.4 Q Limit Q Point 4 44836 Float Per Unit -0.4 – 0.4 Q(U) Slope 44838 Float Per Unit 0–20 DECS-250 Modbus ® Communication...
  • Page 266 LFSM O Max Power Limit Derate 44916 Float Percent Per 0–20 Percent Hertz LFSM U Droop Percent 44918 Float Percent Per 16.67–100 Hertz LFSM O Droop Percent 44920 Float Percent Per 16.67–100 Hertz APC Kg 44922 Float 0–100 Modbus ® Communication DECS-250...
  • Page 267 Active Power Adjust Source 45002 Uint32 None=0 Auxiliary Input=1 Modbus=2 Reserved 45004 Q Volt Limit Adjust Modbus 45006 Float Per Unit -0.45 – 0.45 Q U Volt Bus for Zero Q Adjust Modbus 45008 Float -0.5 – 0.5 DECS-250 Modbus ® Communication...
  • Page 268 Boot Program Version Character 8 47051 Uint8 Reserved 47052-64 Uint8 0–255 RMS Generator Volts Phase A to B 47251 Float RMS Generator Volts Phase B to C 47253 Float RMS Generator Volts Phase C to A 47255 Float Modbus ® Communication DECS-250...
  • Page 269 = in SCL, b2 – b15 are unassigned Annunciation Status Bit Flags 2 47307 Uint16 (0 = clear, 1 = condition present) b0 = loss of field, b1 = in SCL, b2 – b15 are unassigned Reserved 4 47308-375 Filler DECS-250 Modbus ® Communication...
  • Page 270 47505 Float 1–600 Generator CT Primary Current Rating 47507 Float 1–99999 Generator CT Secondary Current Rating 47509 Int32 1=1 5=5 Not used in DECS-250 47511 Float Reserved Float 1 47513 Float 0–10000 Bus Sensing PT Primary Rating 47515 Float 1–500000...
  • Page 271 AVR Mode Setpoint Adjustable Maximum 47665 Float Percent 70–120 Var Mode Setpoint Adjustable Maximum 47667 Float Percent -100 – 100 PF Mode Setpoint Adjustable Maximum 47669 Float Power -1 – -0.5 Factor Minimum Value for FCR Adjustable 47671 Float Maximum DECS-250 Modbus ® Communication...
  • Page 272 0–30 Time Allowed for On-line Medium OEL 47807 Float Second 0–120 Level On-line Low OEL Level 47809 Float 0–20 Reserved 13 47811 Float 0–99 Time Allowed for Off-line High OEL 47813 Float Second 0 - 10 Modbus ® Communication DECS-250...
  • Page 273 T'do=7.0 Te=1.17=13 T'do=7.5 Te=1.25=14 T'do=8.0 Te=1.33=15 T'do=8.5 Te=1.42=16 T'do=9.0 Te=1.50=17 T'do=9.5 Te=1.58=18 T'do=10.0 Te=1.67=19 T'do=10.5 Te=1.75=20 Custom=21 Secondary AVR Mode Proportional Gain 47895 Float 0–1000 - Kp Secondary AVR Mode Integral Gain - Ki 47897 Float 0–1000 DECS-250 Modbus ® Communication...
  • Page 274 Output for Relay 3 48097 Uint16 Reserved 16 bit 13 48098-116 Uint16 0–65535 Output for Relay 4 48117 Uint16 Reserved 16 bit 18 48118-136 Uint16 0–65535 Output for Relay 5 48137 Uint16 Reserved 16 bit 23 48138-141 Uint16 0–65535 Modbus ® Communication DECS-250...
  • Page 275 57600 Baud=57600 RS485 Parity 48165 Uint16 Even Parity=0 Odd Parity=1 No Parity=2 RS485 Stop Bits 48166 Uint16 1 Stop Bit=1 2 Stop Bits=2 DECS-250 Polling Address 48167 Uint16 1–247 Modbus Response Time Delay 48168 Uint16 Millisecond 10–10000 Reserved 26 48169-220 Filler...
  • Page 276 28-48 9440300990 Modbus ® Communication DECS-250...

  • Page 277: Profibus Communication

    9440300990 29-1 29 • PROFIBUS Communication On units equipped with the PROFIBUS communication protocol (style xxxxxxP), the DECS-250 sends and receives PROFIBUS data through a DB-9 port located on the right side panel. Caution This product contains one or more nonvolatile memory devices. Nonvolatile memory is used to store information (such as settings) that needs to be preserved when the product is power-cycled or otherwise restarted.
  • Page 278 Not in var mode=0, In var mode=1 Table 29-3 shows the bit number of each parameter in instance 8 and an example packet returned from a DECS-250. Reading a value of 0x02 (0000 0010) for instance 8 indicates that the device is operating in FCR mode.
  • Page 279 Table 29-5 shows the bit number of each parameter in instance 11 and an example packet returned from a DECS-250. Reading a value of 0xA4 06 (1010 0100 0000 0110) for instance 11 indicates that contact outputs 2, 5, 7, 9, and 10 are closed. The first byte is 1010 0100 and the second is 0000 0110.
  • Page 280 Excitation Voltage Setpoint 0 - 75 Setpoint Metering Cyclic Float Gen Var Setpoint GG kvar 0 – 41.57 Setpoint Metering Cyclic Float Gen Pf Setpoint GG 0.5 – -0.5 Synchronizer Metering Float Slip Angle GG -359.9 - 359.9 Cyclic PROFIBUS Communication DECS-250...
  • Page 281 Local Contact Inputs Cyclic UINT8 Contact Inputs Input 3 No Unit Open=0, Closed=1 Local Contact Inputs Cyclic UINT8 Contact Inputs Input 4 No Unit Open=0, Closed=1 Local Contact Inputs Cyclic UINT8 Contact Inputs Input 5 No Unit Open=0, Closed=1 DECS-250 PROFIBUS Communication...
  • Page 282 Secondary settings active=1 SELECT SECONDARY SETTINGS Settings Group Indication UINT8 DECSCONTROL DECS No Unit Primary settings active=0, Cyclic VAR LIMITER Secondary settings active=1 SELECT SECONDARY SETTINGS Gen Metering Float VAB GG (Gen Voltage 0 - 2000000000 Magnitude) PROFIBUS Communication DECS-250...
  • Page 283 Angle) Bus Metering Float Freq GG 10 - 180 Bus Metering Per Unit Float Bus Vab pu GG Per Unit -10 - 10 Bus Metering Per Unit Float Bus Vbc pu GG Per Unit -10 - 10 DECS-250 PROFIBUS Communication...
  • Page 284 FVR not active=0, FVR active=1 Controller Active Control Panel Status UINT8 DECS Control DECS VAR No Unit VAR not active=0, VAR active=1 Controller Active Control Panel Status UINT8 DECS Control DECS PF No Unit PF not active=0, PF active=1 Controller Active PROFIBUS Communication DECS-250...
  • Page 285 System Status UINT8 DECS Control DECS No Unit Manual mode not enabled via Manual PLC=0, Manual mode enabled via Mode Enable PLC=1 System Status UINT8 DECS Control DECS FVR No Unit FVR not active=0, FVR active=1 Controller Active DECS-250 PROFIBUS Communication...
  • Page 286 AEM Analog Input Meter Float Analog Input 8 Raw Value V / mA 0 - 10 V or 4 - 20 mA AEM Analog Input Meter Float Analog Input 1 Scaled No Unit -9999 - 9999 Value GG PROFIBUS Communication DECS-250...
  • Page 287 No Unit Not tripped-0, Tripped=1 Trip AEM Analog Input Status UINT8 AEM Protection 4 Thresh 3 No Unit Not tripped-0, Tripped=1 Trip AEM Analog Input Status UINT8 AEM Protection 4 Thresh 4 No Unit Not tripped-0, Tripped=1 Trip DECS-250 PROFIBUS Communication...
  • Page 288 Deg F AEM RTD Input Meter Float RTD Input 5 Scaled Value Deg F AEM RTD Input Meter Float RTD Input 6 Scaled Value Deg F AEM RTD Input Meter Float RTD Input 7 Scaled Value Deg F PROFIBUS Communication DECS-250...
  • Page 289 No Unit Not tripped=0, Tripped=1 Trip AEM RTD Input Status UINT8 RTD Protection 6 Thresh 1 No Unit Not tripped=0, Tripped=1 Trip AEM RTD Input Status UINT8 RTD Protection 6 Thresh 2 No Unit Not tripped=0, Tripped=1 Trip DECS-250 PROFIBUS Communication...
  • Page 290 Open=0, Closed=1 Contact Output Status UINT8 Contact Outputs Output 6 No Unit Open=0, Closed=1 Contact Output Status UINT8 Contact Outputs Output 7 No Unit Open=0, Closed=1 Contact Output Status UINT8 Contact Outputs Output 8 No Unit Open=0, Closed=1 PROFIBUS Communication DECS-250...
  • Page 291 AEM Analog Output Status UINT8 Remote Analog Output 4 No Unit Value in range=0, Value out of Out of Range range=1 Config. Prot. Status UINT8 Configurable Protection 1 No Unit Not tripped=0, Tripped=1 Configurable Protection Threshold 1 Trip DECS-250 PROFIBUS Communication...
  • Page 292 Threshold 1 Trip Config. Prot. Status UINT8 Configurable Protection 6 No Unit Not tripped=0, Tripped=1 Configurable Protection Threshold 2 Trip Config. Prot. Status UINT8 Configurable Protection 6 No Unit Not tripped=0, Tripped=1 Configurable Protection Threshold 3 Trip PROFIBUS Communication DECS-250...
  • Page 293 0 - 25 characters Version CEM Device Info Boot String Boot Version Number GG No Unit 0 - 25 characters Version CEM Device Info App Build String App Build Date GG No Unit 0 - 25 characters Date DECS-250 PROFIBUS Communication...
  • Page 294 Setpoint Limit GG FCR Setpoints Float Excitation Current Max 0 - 120 Setpoint Limit GG FCR Setpoints Float Excitation Current 0 - 12 Preposition 1 GG FCR Setpoints Float Excitation Current 0 - 12 Preposition 2 GG PROFIBUS Communication DECS-250...
  • Page 295 0.5 – 1 Limit GG PF Setpoints Float Gen Pf Max Setpoint -1 - -0.5 Limit GG PF Setpoints Float Gen PF Preposition 1 GG 0.5 – -0.5 PF Setpoints Float Gen PF preposition 2 GG 0.5 – -0.5 DECS-250 PROFIBUS Communication...
  • Page 296 Start Bias GG Startup Float Startup Sec Soft 1 - 7200 Start Time GG Startup Float DECS Field Flash No Unit 0 - 100 Level GG Startup Float DECS Field Flash No Unit 1 - 50 Time GG PROFIBUS Communication DECS-250...
  • Page 297 No Unit 0 - 1000 VAR Gains Float Var Ki GG No Unit 0 - 1000 VAR Gains Float Var Kg GG No Unit 0 - 1000 PF Gains Float PF Ki GG No Unit 0 - 1000 DECS-250 PROFIBUS Communication...
  • Page 298 OEL Sec Takeover No Unit 0.1 - 20 Time Dial Off GG OEL Takeover Float OEL Sec Takeover 0 - 40 Cur Max On GG OEL Takeover Float OEL Sec Takeover 0 - 20 Cur Min On GG PROFIBUS Communication DECS-250...
  • Page 299 0 - 300 VAR Limiter Settings Float Var Limit Pri 0 - 200 Setpoint GG VAR Limiter Settings Float Var Limit Sec Delay GG 0 - 300 VAR Limiter Settings Float Var Limit Sec 0 - 200 Setpoint GG DECS-250 PROFIBUS Communication...
  • Page 300 0 - 3 Hertz Slope Lo GG Underfrequency /Volts per Float Sys Option Voltage Per Hz 0 - 10 Hertz Slope Time GG PSS Configure UINT32 Sys Option PSS No Unit Disabled=0 Enabled=1 Power Level Enable GG PROFIBUS Communication DECS-250...
  • Page 301 PSS Primary Tw 1 GG 1 - 20 Primary Float PSS Filter Parameter Float PSS Primary Tw 2 GG 1 - 20 Primary Float PSS Filter Parameter Float PSS Primary Tw 3 GG 1 - 20 Primary Float DECS-250 PROFIBUS Communication...
  • Page 302 PSS Secondary Zn1 GG No Unit 0 - 1 Float PSS Parameter Secondary Float PSS Secondary Zn2 GG No Unit 0 - 1 Float PSS Parameter Secondary Float PSS Secondary Zd1 GG No Unit 0 - 1 Float PROFIBUS Communication DECS-250...
  • Page 303 PSS Secondary Lmt Vhi No Unit 0.01 - 0.04 Secondary PSS Output Limiter Float PSS Secondary LmtVlo GG No Unit -0.04 - -0.01 Secondary PSS Output Limiter Float PSS Secondary Lmt T No Unit 0 - 2 Secondary Delay GG DECS-250 PROFIBUS Communication...
  • Page 304 0.1 - 600 (Gen Sensing) Delay GG Bus Condition Detection Float Gen Failed Activation 0.1 - 600 (Gen Sensing) Delay GG Bus Condition Detection Float Gen Stable Low Line No Unit 0.001 - 3 (Gen Sensing) Scale Factor GG PROFIBUS Communication DECS-250...
  • Page 305 0 - 600000 Gen Undervoltage Float Time Delay PS 100 - 60000 Loss of Sensing UINT32 Mode GG No Unit Disabled=0 Enabled=1 Loss of Sensing UINT32 Sys Option No Sense To No Unit Disabled=0 Enabled=1 Manual Mode GG DECS-250 PROFIBUS Communication...
  • Page 306 Disabled=0 Enabled=1 Power Input Failure Float Time Delay GG 0 - 10 Exciter Diode Monitor UINT32 Exciter Open No Unit Disabled=0 Enabled=1 Diode Enable GG Exciter Diode Monitor UINT32 Exciter Shorted No Unit Disabled=0 Enabled=1 Diode Enable GG PROFIBUS Communication DECS-250...
  • Page 307 Config Protection 1 Float Threshold 3 0 - 300 Activation Delay GG Config Protection 1 Float Threshold 4 Pickup GG No Unit -999999 - 999999 Config Protection 1 Float Threshold 4 0 - 300 Activation Delay GG DECS-250 PROFIBUS Communication...
  • Page 308 Config Protection 2 Float Threshold 3 0 - 300 Activation Delay GG Config Protection 2 Float Threshold 4 Pickup GG No Unit -999999 - 999999 Config Protection 2 Float Threshold 4 0 - 300 Activation Delay GG PROFIBUS Communication DECS-250...
  • Page 309 Config Protection 3 Float Threshold 3 0 - 300 Activation Delay GG Config Protection 3 Float Threshold 4 Pickup GG No Unit -999999 - 999999 Config Protection 3 Float Threshold 4 0 - 300 Activation Delay GG DECS-250 PROFIBUS Communication...
  • Page 310 Config Protection 4 Float Threshold 3 0 - 300 Activation Delay GG Config Protection 4 Float Threshold 4 Pickup GG No Unit -999999 - 999999 Config Protection 4 Float Threshold 4 0 - 300 Activation Delay GG PROFIBUS Communication DECS-250...
  • Page 311 Config Protection 5 Float Threshold 3 0 - 300 Activation Delay GG Config Protection 5 Float Threshold 4 Pickup GG No Unit -999999 - 999999 Config Protection 5 Float Threshold 4 0 - 300 Activation Delay GG DECS-250 PROFIBUS Communication...
  • Page 312 Config Protection 6 Float Threshold 3 0 - 300 Activation Delay GG Config Protection 6 Float Threshold 4 Pickup GG No Unit -999999 - 999999 Config Protection 6 Float Threshold 4 0 - 300 Activation Delay GG PROFIBUS Communication DECS-250...
  • Page 313 Config Protection 7 Float Threshold 3 0 - 300 Activation Delay GG Config Protection 7 Float Threshold 4 Pickup GG No Unit -999999 - 999999 Config Protection 7 Float Threshold 4 0 - 300 Activation Delay GG DECS-250 PROFIBUS Communication...
  • Page 314 Float Threshold 2 Pickup GG No Unit -9999 - 9999 Remote Analog In 1 Float Threshold 2 0 - 300 Activation Delay GG Remote Analog In 1 Float Threshold 3 Pickup GG No Unit -9999 - 9999 PROFIBUS Communication DECS-250...
  • Page 315 Float Threshold 2 Pickup GG No Unit -9999 - 9999 Remote Analog In 3 Float Threshold 2 0 - 300 Activation Delay GG Remote Analog In 3 Float Threshold 3 Pickup GG No Unit -9999 - 9999 DECS-250 PROFIBUS Communication...
  • Page 316 Float Threshold 2 Pickup GG No Unit -9999 - 9999 Remote Analog In 5 Float Threshold 2 0 - 300 Activation Delay GG Remote Analog In 5 Float Threshold 3 Pickup GG No Unit -9999 - 9999 PROFIBUS Communication DECS-250...
  • Page 317 Float Threshold 2 Pickup GG No Unit -9999 - 9999 Remote Analog In 7 Float Threshold 2 0 - 300 Activation Delay GG Remote Analog In 7 Float Threshold 3 Pickup GG No Unit -9999 - 9999 DECS-250 PROFIBUS Communication...
  • Page 318 Float Threshold 2 Pickup GG Deg F -58 - 482 Remote RTD In 1 Float Threshold 2 0 - 300 Activation Delay GG Remote RTD In 1 Float Threshold 3 Pickup GG Deg F -58 - 482 PROFIBUS Communication DECS-250...
  • Page 319 UINT32 Threshold 3 Type GG No Unit Disabled=0 Over=1 Under=2 Remote RTD In 4 UINT32 Threshold 4 Type GG No Unit Disabled=0 Over=1 Under=2 Remote RTD In 4 Float Cal Offset GG Deg F -99999 - 99999 DECS-250 PROFIBUS Communication...
  • Page 320 Float Threshold 3 Pickup GG Deg F -58 - 482 Remote RTD In 6 Float Threshold 3 0 - 300 Activation Delay GG Remote RTD In 6 Float Threshold 4 Pickup GG Deg F -58 - 482 PROFIBUS Communication DECS-250...
  • Page 321 -99999 - 99999 Remote TC In 1 Float Hysteresis GG 0 - 100 Remote TC In 1 Float Arming Delay GG 0 - 300 Remote TC In 1 Float Threshold 1 Pickup GG Deg F 32 - 2507 DECS-250 PROFIBUS Communication...
  • Page 322 Remote Analog Out 1 Float Param Min GG No Unit -99999 - 99999 Remote Analog Out 1 Float Param Max GG No Unit -99999 - 99999 Remote Analog Out 1 Float Current Min GG 4 - 20 PROFIBUS Communication DECS-250...
  • Page 323 Remote Analog Out 3 Float Param Min GG No Unit -99999 - 99999 Remote Analog Out 3 Float Param Max GG No Unit -99999 - 99999 Remote Analog Out 3 Float Current Min GG 4 - 20 DECS-250 PROFIBUS Communication...
  • Page 324 Delay GG User Programmable Alarms Float Programmable Alarm 9 0 - 300 Delay GG User Programmable Alarms Float Programmable Alarm 10 0 - 300 Delay GG User Programmable Alarms Float Programmable Alarm 11 0 - 300 Delay GG PROFIBUS Communication DECS-250...
  • Page 325 Counter 8 Output No Unit 0 - 1800 Timeout GG AEM RTD TC Metric Meter Float RTD Input 1 Deg C Metric Value GG AEM RTD TC Metric Meter Float RTD Input 2 Deg C Metric Value GG DECS-250 PROFIBUS Communication...
  • Page 326 Active AVR Setpoint Configured Active Setpoint Meter Float Active FCR Setpoint Configured Active Setpoint Meter Float Active FVR Setpoint Configured Active Setpoint Meter Float Active kvar Setpoint kvar Configured Active Setpoint Meter Float Active PF Setpoint Configured PROFIBUS Communication DECS-250...

  • Page 327: Maintenance

    250 from service. Refer to the appropriate site schematics to ensure that all steps have been taken to properly and completely de-energize the DECS-250. Storage If the unit is not installed immediately DECS-250, store it in the original shipping package in a moisture- and dust-free environment. Preventive Maintenance Connections Periodically check the connections of the DECS-250 to ensure they are clean and tight and remove any accumulation of dust.
  • Page 328 The DECS-250 Appears Inoperative If the DECS-250 does not power up (no backlighting on front panel display), ensure that the control power applied to the unit (AC input terminals L and N, DC input terminals BATT+ and BATT–) is at the correct level.
  • Page 329 If your PF, var, or watt readings are significantly different from the expected readings for a known load, verify that the B-phase current sensing input of the DECS-250 is connected to a CT on phase B and not phases A or C.
  • Page 330 30-4 9440300990 Maintenance DECS-250...

  • Page 331: Specifications

    For redundant applications with a single-phase, 300 Hz Marathon ® PMG, only one DECS-250 can be connected to the PMG at a time. In redundant applications, a contactor should be used for each DECS- 250 power input or equipment damage may result.
  • Page 332 Range ..........1 Aac or 5 Aac nominal Frequency ........50/60 Hz Burden 1 Aac Sensing ......<5 VA 5 Aac Sensing ......<10 VA Terminals A-Phase..........CTA+, CTA– B-Phase..........CTB+, CTB– C-Phase ........... CTC+, CTC– Cross-Current Compensation ..CCCT+, CCCT– Specifications DECS-250...
  • Page 333 Programmable Input 12 ....IN 12, COM B Programmable Input 13 ....IN 13, COM B Programmable Input 14 ....IN 14, COM B Communication Ports Universal Serial Bus (USB) Interface ........... USB type B port Location ..........Front panel DECS-250 Specifications...
  • Page 334 Contact Outputs Make and Break Ratings (Resistive) 24 Vdc ........7.0 Adc 48 Vdc ........0.7 Adc 125 Vdc ........0.2 Adc 120/240 Vac ....... 7.0 Aac Carry Ratings (Resistive) 24/48/125 Vdc......7.0 Adc 120/240 Vac ....... 7.0 Aac Specifications DECS-250...
  • Page 335 Var Operating Mode Setpoint Range ........ –100% (leading) to +100% (lagging) of the generator nominal apparent power in increments of 0.1% Regulation Accuracy ......±2.0% of the nominal generator apparent power rating at the rated generator frequency DECS-250 Specifications...
  • Page 336 Range ..........30 to 70 Hz Increment ......... 0.01 Hz Time Delay Time Delay Range ......0 to 300 s Increment ......... 0.1 s Voltage Inhibit (81U only) Range ..........50 to 100% of Rated Voltage Increment ......... 1% Specifications DECS-250...
  • Page 337 Single-Phase Source ....... <10 Vac Three-Phase Source ......<50 Vac or a phase-to-phase imbalance >20% Time Delay Range ..........0 to 10 s Increment ......... 0.1 s Exciter Diode Monitor (EDM) Pole Ratio Range ..........0 to 10 Increment ......... 0.01 DECS-250 Specifications...
  • Page 338 Power System Stabilizer (Style xPxxxxx) Model ..........IEEE Std 421.5 type PSS2A/2B/2C Operating Mode ....... Generator or Motor, ABC or ACB phase sequence Sensing Configuration ...... Power and Speed or Speed only Power Measurement ......Two Wattmeter method or Three Wattmeter method Specifications DECS-250...
  • Page 339 Input/Output status changes, system operating status changes, or alarm annunciations. Data Logging (Oscillography) Up to 6 variables can be logged. The sampling rate is 1,200 data points per log, up to 1,199 pre-trigger, 4 ms to 10 s intervals, (4.8 s to 12,000 s total log duration). DECS-250 Specifications...
  • Page 340 HALT (Highly Accelerated Life Testing) HALT is used by Basler Electric to prove that our products will provide the user with many years of reliable service. HALT subjects the device to extremes in temperature, shock, and vibration to simulate years of operation, but in a much shorter period.
  • Page 341 Det Norske Veritas - Germanischer Lloyd (DNV•GL) • American Bureau of Shipping (ABS) IEC 60092-504 used for evaluation. For current certificates, see www.basler.com. UL Certification This product is a Recognized Component ( ) covering the US and Canadian. UL File (E97035-FPTM2/FPTM8)
  • Page 342 31-12 9440300990 Specifications DECS-250...

  • Page 343: Analog Expansion Module

    9440300990 32-1 32 • Analog Expansion Module General Information The optional AEM-2020 is a remote auxiliary device that provides additional DECS-250 analog inputs and outputs. Features The AEM-2020 has the following features: • Eight Analog Inputs • Eight RTD Inputs •...
  • Page 344 52 to 500 to 52 Hz ...... 5 G peak for 7.5 min. HALT (Highly Accelerated Life Testing) HALT is used by Basler Electric to prove that our products will provide the user with many years of reliable service. HALT subjects the device to extremes in temperature, shock, and vibration to simulate years of operation, but in a much shorter period span.
  • Page 345 Inspect for damage, and if there is evidence of such, immediately file a claim with the carrier and notify the Basler Electric regional sales office, your sales representative, or a sales representative at Basler Electric, Highland, Illinois USA.
  • Page 346 Also, the connectors and headers are uniquely keyed to ensure that the connectors mate only with the correct headers. The 12-position connector is not a plug-in connector and is mounted permanently to the board. Analog Expansion Module DECS-250...
  • Page 347 P1- – (BATT–) Negative side of operating power input P1- + (BATT+) Positive side of operating power input AEM-2020 Inputs and Outputs Input and output terminals are shown in Figure 32-2 and listed in Table 32-2. DECS-250 Analog Expansion Module...
  • Page 348 External Analog Input Connections Voltage input connections are shown in Figure 32-3 and current input connections are shown in Figures 36 through 38. When using the current input, AIN V+ and AIN I+ must be tied together. Analog Expansion Module DECS-250...
  • Page 349 9440300990 32-7 AEM-2020 AIN I+ 0 – 10 Vdc – Voltage AIN V+ Transducer Figure 32-3. Analog Inputs - Voltage Input Connections Figure 32-4. Analog Inputs - Current Input Connections, Type II 2-Wire Circuit DECS-250 Analog Expansion Module...
  • Page 350 Figure 32-5. Analog Inputs - Current Input Connections, Type III 2-Wire Circuit Figure 32-6. Analog Inputs - Current Input Connections, Type IV 2-Wire Circuit External RTD Input Connections External 2-wire RTD input connections are shown in Figure 32-7. Figure 32-8 shows external 3-wire RTD input connections. Analog Expansion Module DECS-250...
  • Page 351 These terminals provide communication using the SAE J1939 protocol and provide high-speed communication between the Analog Expansion Module and the DECS-250. Connections between the AEM-2020 and DECS-250 should be made with twisted-pair, shielded cable. CAN Bus interface terminals are listed in Table 32-3. Refer to Figure 32-9 and Figure 32-10.
  • Page 352 Figure 32-9. CAN Bus Interface with AEM-2020 providing One End of the Bus CEM-2020 AEM-2020 (Optional) Stub CAN-H DECS-250 Genset CAN-L P0064-09 120 ohm 120 ohm Termination Termination Other Devices Figure 32-10. CAN Bus Interface with DECS-250 providing One End of the Bus Analog Expansion Module DECS-250...
  • Page 353 The analog expansion module must be enabled with the correct J1939 address. A Control Area Network (CAN) is a standard interface that enables communication between the AEM-2020 and the DECS-250. The Remote Module Setup screen is illustrated in Figure 32-11.
  • Page 354 The remote RTD inputs are incorporated into a BESTlogicPlus programmable logic scheme by selecting them from the I/O group in BESTlogicPlus. For more details, refer to the BESTlogicPlus chapter. BESTCOMSPlus settings for remote RTD inputs are illustrated in Figure 32-13. Remote RTD Input #1 is ® shown. Analog Expansion Module DECS-250...
  • Page 355 The remote thermocouple inputs are incorporated into a BESTlogicPlus programmable logic scheme by selecting them from the I/O group in BESTlogicPlus. For more details, refer to the BESTlogicPlus chapter. BESTCOMSPlus® settings for remote thermocouple inputs are illustrated in Figure 32-14. Remote Thermocouple Input #1 is shown. DECS-250 Analog Expansion Module...
  • Page 356 This red LED flashes to indicate that the AEM-2020 is powered up and functioning properly. The LED lights solid during power up. When the power-up sequence is complete, this LED flashes. If the LED does not flash after power up, contact Basler Electric. Analog Expansion Module...
  • Page 357 LED is green. Refer to Figure 32-18. Remote Thermocouple Input #1 is shown. Figure 32-18. Remote Thermocouple Inputs Metering Analog Input Values BESTCOMSPlus Navigation Path: Metering, Status, Inputs, Remote Analog Input Values HMI Navigation Path: Metering, Status, Inputs, Remote Analog Input Values DECS-250 Analog Expansion Module...
  • Page 358 When connected to a , the Calibrate button shown on the Remote Analog Input Values screen opens the Analog Input Temperature Calibration screen shown in Figure 32-20. This screen is used to calibrate RTD inputs 1 through 8 and thermocouple inputs 1 and 2. Analog Expansion Module DECS-250...
  • Page 359 Preventive maintenance consists of periodically checking that the connections between the AEM-2020 and the system are clean and tight. Analog Expansion Modules are manufactured using state-of-the-art surface-mount technology. As such, Basler Electric recommends that no repair procedures be attempted by anyone other than Basler Electric personnel.
  • Page 360 32-18 9440300990 Analog Expansion Module DECS-250...

  • Page 361: Contact Expansion Module

    33 • Contact Expansion Module General Information The optional CEM-2020 is a remote auxiliary device that provides additional DECS-250 contact inputs and outputs. Two types of modules are available. A standard module (CEM-2020) provides 24 contact outputs and a high current module (CEM-2020H) provides 18 contact outputs.
  • Page 362 52 to 500 to 52 Hz ...... 5 G peak for 7.5 min. HALT (Highly Accelerated Life Testing) HALT is used by Basler Electric to prove that our products will provide the user with many years of reliable service. HALT subjects the device to extremes in temperature, shock, and vibration to simulate years of operation, but in a much shorter period span.
  • Page 363 Inspect for damage, and if there is evidence of such, immediately file a claim with the carrier and notify the Basler Electric regional sales office, your sales representative, or a sales representative at Basler Electric, Highland, Illinois USA.
  • Page 364 33-4 9440300990 Figure 33-1. CEM-2020 Overall Dimensions See Figure 33-2 for CEM-2020H overall dimensions. All dimensions are shown in inches with millimeters in parenthesis. Contact Expansion Module DECS-250...
  • Page 365 Connectors and headers may contain tin- or gold-plated conductors. Tin-plated conductors are housed in a black plastic casing and gold-plated conductors are housed in an orange plastic casing. Mate connectors to headers of the same color only. DECS-250 Contact Expansion Module...
  • Page 366 To follow UL guidelines, a fuse must be implemented in the 2Adc contact circuits (Outputs 12 through 23) of the CEM-2020H used in hazardous locations. The suggested fuse size in Adc = (100/Contact Voltage) with a maximum fuse size of 5Adc. Contact Expansion Module DECS-250...
  • Page 367 9440300990 33-7 Figure 33-3. CEM-2020 Input Contact and Output Contact Terminals DECS-250 Contact Expansion Module...
  • Page 368 These terminals provide communication using the SAE J1939 protocol and provide high-speed communication between the Contact Expansion Module and the DECS-250. Connections between the CEM-2020 and DECS-250 should be made with twisted-pair, shielded cable. CAN Bus interface terminals are listed in Table 33-2. Refer to Figure 33-5 and Figure 33-6.
  • Page 369 Figure 33-5. CAN Bus Interface with CEM-2020 providing One End of the Bus AEM-2020 CEM-2020 (Optional) Stub CAN-H DECS-250 Genset CAN-L P0064-07 120 ohm 120 ohm Termination Termination Other Devices Figure 33-6. CAN Bus Interface with DECS-250 providing One End of the Bus DECS-250 Contact Expansion Module...
  • Page 370 HMI Navigation Path: Settings, Programmable Inputs, Remote Contact Inputs The CEM-2020 provides 10 programmable contact inputs with the same functionality as the contact inputs on the DECS-250. The label text of each contact input is customizable and accepts an alphanumeric character string with a maximum of 64 characters.
  • Page 371 The CEM-2020 provides 24 programmable contact outputs with the same functionality as the contact outputs on the DECS-250. Outputs 12 through 23 can carry 1 A. Outputs 24 through 35 can carry 4 A. The CEM-2020H provides 18 programmable contact outputs with the same functionality as the contact outputs on the DECS-250.
  • Page 372 Preventive maintenance consists of periodically checking that the connections between the CEM-2020 and the system are clean and tight. Contact Expansion Modules are manufactured using state-of-the-art surface-mount technology. As such, Basler Electric recommends that no repair procedures be attempted by anyone other than Basler Electric personnel.
  • Page 374 Highland IL 62249-1074 USA Suzhou Industrial Park 15-06 Peninsula Plaza Tel: +1 618.654.2341 215122 Suzhou Singapore 179098 Fax: +1 618.654.2351 P.R. CHINA Tel: +65 68.44.6445 email: info@basler.com Tel: +86 512.8227.2888 Fax: +65 68.44.8902 Fax: +86 512.8227.2887 email: singaporeinfo@basler.com email: chinainfo@basler.com...

Table of Contents

Save PDF