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GE 169 Instruction Manual

Motor management relay
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169
MOTOR MANAGEMENT RELAY
Instruction Manual
Software Rev: 169.E7.5
Manual P/N: 1601-0003-A4
Copyright 2000 GE Power Management
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GE Power Management
215 Anderson Avenue, Markham, Ontario, L6E 1B3
Tel: (905) 294-6222
Fax: (905) 294-8512
www.GEindustrial.com/pm

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  • Page 1 MOTOR MANAGEMENT RELAY Instruction Manual Software Rev: 169.E7.5 Manual P/N: 1601-0003-A4 Copyright 2000 GE Power Management GE Power Management 215 Anderson Avenue, Markham, Ontario, L6E 1B3 Tel: (905) 294-6222 Fax: (905) 294-8512 www.GEindustrial.com/pm...
  • Page 2 INTENT This manual describes the function, operation and use of the GE Power Management Model 169 and 169 Plus Motor Management Relays. REVISION HISTORY Manual Part No. 169 / 169 Plus Software Revision Release Date (M/D/Y) M17/03/86 - all Rev. A, B, C, Rev. D1...

  • Page 3: Table Of Contents

    2.15 Differential Relay Terminals (169 Plus).................... 19 2.16 Speed Switch Terminals (169 Plus)....................19 2.17 Programming Access Terminals ...................... 19 2.18 RS-422 Serial Communications Terminals (169 Plus) ..............19 2.19 Display Adjustment..........................20 2.20 Front Panel Faceplate........................20 2.21 Spare Input Terminals (169 Plus) ..................... 20 2.22 169 Drawout Relay ..........................
  • Page 4 5.1 Hardware ............................... 81 5.2 Firmware ............................... 83 6.1 169 Relay Powered from One of Motor Phase Inputs..............85 6.2 Loss of Control Power Due to Short Circuit or Ground Fault............85 6.3 Example Using FLC Thermal Capacity Reduction Setpoint ............86...
  • Page 5 Table 3-3 SETPOINTS ............................... 42 Table 3-5 Standard Overload Curve Trip Times (in seconds)..................66 Table 3-6 PRE-STORED FACTORY SETPOINTS (169 SETPOINT PAGES 1-3) ........... 74 Table 3-7 Preset Factory Relay Configurations and Functions ................. 75 Table 4-1 RTD Resistance vs. Temperature ......................79...
  • Page 6 The custom curve feature of the model 169 Plus gives the user additional flexibility. If one of the eight standard overload curves is not suitable for the application under consideration, the user can enter his own breakpoints to form a custom curve.

  • Page 7: Motor Protection Requirements

    169 Plus, including a latched trip relay, an alarm relay, and two auxiliary relays. The model 169 provides a latched trip relay and an alarm relay. All output relays may be programmed via the keypad to trip on specific types of faults or overloads.

  • Page 8: Typical Applications

    1.3 Typical Applications The many features of the 169 make it an ideal choice for a wide range of motor protection applications. Versatile features and controls allow the relay to protect associated mechanical equipment as well as the motor. The 169 should be considered for the following and other typical uses: Protection of motors and equipment from operator abuse.

  • Page 9: Technical Specifications

    GE Power Management 1 INTRODUCTION 1.4 Technical Specifications Phase Current Inputs conversion: calibrated RMS 0.05 to 12 × phase CT primary amps setpoint range: 12 × phase CT primary amps setpoint full scale: accuracy: ±0.5% of full scale (0.05 to 2 X phase CT primary amps setpoint) ±1.0% of full scale (over 2 X phase CT primary amps setpoint)
  • Page 10 GE Power Management 1 INTRODUCTION RTD Inputs 10 Ω copper sensor types: 100 Ω nickel 120 Ω nickel 100 Ω platinum (specified with order) display accuracy: ±2 C trip/alarm setpoint range: 0 to 200°C dead band: 3°C maximum lead resistance: 25% of RTD 0°C resistance...
  • Page 11 Running Hours Counter accuracy: ±1% Note: It is recommended that all 169 relays be powered up at least once per year to avoid deterioration of electrolytic capacitors in the power supply. Due to updating technology, specifications may be improved without notice.

  • Page 13: Physical Dimensions

    2 INSTALLATION 2.1 Physical Dimensions The 169 relay is contained in a compact plastic and metal housing with the keypad, display, and all indicators located on the front panel. The physical dimensions of the 169 unit are given in Figure 2-1.
  • Page 14 GE Power Management 2 INSTALLATION Figure 2-2 CT Dimensions...

  • Page 15: Mounting

    2.2 Mounting The 169 should be positioned so that the display is visible and the front panel keypad is accessible. A cut-out is made in the mounting panel and the unit is mounted as shown in Figure 2-3. Four washers and 10-32 X 3/8"...

  • Page 16: External Connections

    2.3 External Connections The connections made to the 169 relay will vary depending on the programming of the unit. It is not necessary to use all of the connections provided; a minimal configuration would include supply power, three phase current CT inputs and the Trip relay contacts wired in series with the contactor control relay or circuit breaker shunt trip coil.
  • Page 17 GE Power Management 2 INSTALLATION Figure 2-4 Relay Wiring Diagram (AC control power)
  • Page 18 GE Power Management 2 INSTALLATION Figure 2-5 Output Relay Contact States WARNING: In locations where system voltage disturbances cause voltage levels to dip below the range specified in specifications (1.5), any relay contact programmed failsafe may change state. To avoid tripping...
  • Page 19 GE Power Management 2 INSTALLATION Figure 2-6 Relay Wiring Diagram (Two Phase CTs)
  • Page 20 GE Power Management 2 INSTALLATION Figure 2-7 Relay Wiring Diagram (DC Control Power)

  • Page 21: Control Power

    This board is accessed by removing the perforated cover on the rear of the unit. The switch must be correctly set before control power is applied to the 169. Maximum power consumption for the unit is 40 VA (AC version) or 30 W (DC version).

  • Page 22: Ground Fault Ct

    The Trip output relay will remain latched after a trip. This means that once this relay has been activated it will remain in the active state until the 169 is manually reset. The Trip relay contacts may be reset by pressing the RESET key (see section 3.1) if motor conditions allow, or by using the Emergency Restart feature (see section 2.12).

  • Page 23: Auxiliary Relay #1 Contacts (169 Plus)

    RTDs used together with RTD trip and alarm temperatures must be programmed into the 169 (see sections 3.16, 3.17). The RTD type to be used must be specified when ordering the 169 relay. If the type of RTD in use is to be changed, the 169 must be returned to the factory.

  • Page 24: Emergency Restart Terminals

    54 and 55. Momentarily shorting these terminals together will cause the thermal memory of the 169 to discharge to 0% (if RTD input to thermal memory is enabled, thermal memory can be reduced to 0% by keeping terminals 54 and 55 shorted together for more than 11 seconds; see section 3.20). The Emergency Restart terminals can thus be used to override an OVERLOAD TRIP.

  • Page 25: Differential Relay Terminals (169 Plus)

    Up to 20 169 Plus "SLAVES" can be connected to one "MASTER" (169 Plus or other device) as shown in Figure 2-9. If devices other than 169 Plus relays are to be connected in the serial link a copy of the "Multilin 169 Plus Relay Communication Protocol"...

  • Page 26: Display Adjustment

    2.19 Display Adjustment Once the 169 relay has been installed and input power applied, the contrast of the LCD display may have to be adjusted. This adjustment has been made at the factory for average lighting conditions and a standard viewing angle but can be changed to optimize the display readability in different environments.

  • Page 27: 169 Drawout Relay

    2.22 169 Drawout Relay The model 169 and 169 Plus relays are available in a drawout case option. The operation of the relay is the same as described elsewhere in this manual except for the differences noted in this section. The physical dimensions of the drawout relay are as shown in Figure 2-10.
  • Page 28 GE Power Management 2 INSTALLATION Figure 2-10 169 Drawout Relay Physical Dimensions...
  • Page 29 GE Power Management 2 INSTALLATION Figure 2-11 169 Drawout Relay Mounting...
  • Page 30 GE Power Management 2 INSTALLATION Figure 2-12 169 Plus Drawout Relay Typical Wiring Diagram...
  • Page 31 GE Power Management 3 SETUP AND USE Figure 3-1 Front Panel Controls and Indicators...

  • Page 32: Controls And Indicators

    3.1 Controls and Indicators Once the 169 relay has been wired and control power applied, it is ready to be programmed for the given application. Programming is accomplished using the 12 position keypad and 48 character alphanumeric display shown in Figure 3-1.
  • Page 33 GE Power Management 3 SETUP AND USE Name Description EFFECT: Pressing this key will put the relay into SETPOINTS mode. The flash message, SETPOINTS HAS SIX PAGES OF DATA is displayed for 2 seconds. The beginning of page 1 of SETPOINTS mode is then shown:...
  • Page 34 RESET FUNCTION: The RESET key allows the user to reset the 169 after any of the latched output relays have become active so that a motor start can be attempted.
  • Page 35 Name Description STORE FUNCTION: The STORE key allows the user to store new setpoints into the 169 relay's internal memory. EFFECT: When this key is pressed in SETPOINTS mode the currently displayed setpoint will be stored and will immediately come into effect. When a setpoint is stored the flash...

  • Page 36: 169 Relay Display Modes

    3.3 ACTUAL VALUES Mode In ACTUAL VALUES mode, any of the parameters monitored or calculated by the 169 relay may be viewed by the user. This mode is divided into six separate pages of data each of which contains a different group of actual motor...
  • Page 37 GE Power Management 3 SETUP AND USE Table 3-2 Actual Values 3$*( /,1( '(6&5,37,21 PAGE 1: ACTUAL VALUES PHASE CURRENT DATA ACTUAL VALUES page 1 header. MOTOR STARTING ###1###2###3###4###5###6 Motor starting current level (seen only during a motor start). I1= XXXX I2= XXXX I3= XXXX (AMPS) --- Motor phase current data.
  • Page 38 GE Power Management 3 SETUP AND USE 3$*( /,1( '(6&5,37,21 PAGE 2: ACTUAL VALUES RTD TEMPERATURE DATA ACTUAL VALUES page 2 header. HOTTEST STATOR RTD RTD # X = XXX C Maximum stator RTD temperature. STATOR TEMPERATURE RTD #1= XXX DEGREES C...
  • Page 39 RTD TEMPERATURE RTD #8= XXX DEGREES C AMBIENT TEMPERATURE RTD #8= XXX DEGREES C RTD #8 temperature. Ambient seen when RTD #8 is used for ambient sensing on model 169. RTD TEMPERATURE RTD #9= XXX DEGREES C RTD #9 temperature.
  • Page 40 GE Power Management 3 SETUP AND USE 3$*( /,1( '(6&5,37,21 MAXIMUM RTD#7 TEMP SINCE LAST ACCESS: RTD# X = XXX Maximum RTD #7 temperature since last access. MAXIMUM RTD#8 TEMP SINCE LAST ACCESS = XXX C Maximum RTD #8 temperature since last access.
  • Page 41 GE Power Management 3 SETUP AND USE 3$*( /,1( '(6&5,37,21 PAGE 3: ACTUAL VALUES MOTOR CAPACITY DATA ACTUAL VALUES page 3 header. ESTIMATED TIME TO TRIP = XXX SECONDS Estimated time to overload trip under present conditions (seen only during overloads).
  • Page 42 GE Power Management 3 SETUP AND USE 3$*( /,1( '(6&5,37,21 PAGE 4: ACTUAL VALUES STATISTICAL DATA ACTUAL VALUES page 4 header. RUNNING HRS SINCE LAST COMMISSIONING XXXXX HRS Total motor running hours since last commissioning. # OF STARTS SINCE LAST COMMISSIONING XXX Total number of motor starts since last commissioning.
  • Page 43 GE Power Management 3 SETUP AND USE 3$*( /,1( '(6&5,37,21 START NEW COMMISSIONING? Used to clear the data in the last 10 lines (see section 3.1, STORE key). END OF PAGE FOUR ACTUAL VALUES Last line of page 4.
  • Page 44 GE Power Management 3 SETUP AND USE 3$*( /,1( '(6&5,37,21 PAGE 5: ACTUAL VALUES PRE-TRIP DATA ACTUAL VALUES page 5 header. PRE-TRIP AVERAGE MOTOR CURRENT = XXXXX AMPS Average motor phase current prior to last relay trip. PRE-TRIP U/B RATIO (In/Ip) XXX PERCENT Ratio of negative to positive sequence currents prior to last relay trip.
  • Page 45 LEARNED ACCEL. TIME ACCEL. TIME = XX.X SEC. Learned motor acceleration time. LEARNED Start Capacity required = XX PERCENT Learned motor thermal capacity used during a start. END OF PAGE SIX ACTUAL VALUES Last line of page 6. * 169 Plus only...
  • Page 46 GE Power Management 3 SETUP AND USE To place the relay in ACTUAL VALUES mode, the ACTUAL VALUES key must be pressed. When this is done the following flash message will appear for 2 seconds, ACTUAL VALUES HAS SIX PAGES OF DATA...

  • Page 47: Setpoints Mode

    CLEAR key can be used. When the setpoint is adjusted to its proper value the STORE key should be pressed in order to store the setpoint into the 169's internal memory. Once the STORE key is...
  • Page 48 GE Power Management 3 SETUP AND USE Table 3-3 SETPOINTS 3$*( ,1)250$7,21 /,1( 5$1*( 0$18$/ 5() PAGE 1: SETPOINTS VALUES MOTOR AMPS SETPOINTS :1 or :5 PHASE CT RATIO SECONDARY = X AMP 20-1500 (increments of 1) PHASE CT RATIO...
  • Page 49 GE Power Management 3 SETUP AND USE 3$*( ,1)250$7,21 /,1( 5$1*( 0$18$/ 5() 0.0 (Instantaneous) – 20.0 seconds (increments 3.11 G/F TRIP TIME DELAY of 0.5). Additional time delay of 0.25 seconds G/F DELAY= XX.X SECONDS following 20.0. 1-1000 amps or OFF (increments of 1) 3.12...
  • Page 50 GE Power Management 3 SETUP AND USE 3$*( ,1)250$7,21 /,1( 5$1*( 0$18$/ 5() PAGE 2: SETPOINT VALUES RTD SETPOINTS 0-6 (increments of 1) 3.16 # OF STATOR RTDS USED # OF RTDs = X 0-200 degrees C or OFF (increments of 1) 3.16...
  • Page 51 GE Power Management 3 SETUP AND USE 3$*( ,1)250$7,21 /,1( 5$1*( 0$18$/ 5() 0-200 degrees C or OFF (increments of 1) 3.16 RTD #4 ALARM LEVEL = XXX DEGREES C STATOR #4 ALARM LEVEL = XXX DEGREES C 0-200 degrees C or OFF (increments of 1) 3.16...
  • Page 52 GE Power Management 3 SETUP AND USE 3$*( ,1)250$7,21 /,1( 5$1*( 0$18$/ 5() 0-200 degrees C or OFF (increments of 1) 3.17 RTD #8 ALARM LEVEL = XXX DEGREES C 0-200 degrees C or OFF (increments of 1) 3.17 RTD #8 TRIP LEVEL...
  • Page 53 YES voids selected curve 1-8 (this line is not seen when using a custom 3.18 SELECTED CURVE NUMBER curve on a 169 Plus) CURVE # = X (The following lines are not seen when using 3.18 Check all custom curve...
  • Page 54 1-2000 seconds (increments of 1) 3.18 TRIP TIME @ 7.50 X FLC = XXXX SECONDS 1-2000 seconds (increments of 1) 3.18 TRIP TIME @ 8.00 X FLC = XXXX SECONDS END OF PAGE THREE SETPOINT VALUES * 169 Plus only...
  • Page 55 RELAY CONFIGURATION This page assigns trip and alarm functions to specific output relays (i.e. TRIP, ALARM, AUX. 1, AUX. 2 on the 169 Plus, or TRIP and ALARM on the model 169). Each trip/alarm function is assigned separately to the appropriate relay or to "NO" relay. If an alarm feature is assigned to no relay, it can still become active (i.e.
  • Page 56 PAGE 5: SETPOINT VALUES SYSTEM CONFIGURATION This page is used to configure the 169 relay to exactly match the motor and motor system being protected. Various special features can be selected, defeated, or adjusted in this page of setpoints. NORMAL RUN DISPLAY SHOWS...
  • Page 57 COOL TIME ? XX (model 169 Plus only) This code is used to tell the 169 relay to use the learned motor cooling time values. These times can be examined in ACTUAL VALUES mode, page 6. When learned values are not used, the user entered default times will be used: YES - Relay uses default cool times;...
  • Page 58 RTD10 AMBIENT SENSOR ? (RTD 8 – model 169; RTD 10 – model 169 Plus). This code is used to select one of the bearing RTDs as an ambient air temperature sensor. When stored as YES, trip and alarm levels for the selected RTD will be automatically set to "OFF".
  • Page 59 YES - Single-shot restart enabled; NO - Single-shot restart disabled. Factory Value = NO Enable start inhibit? (model 169 Plus only) This setpoint is used to enable or defeat the Start Inhibit feature of the relay described in section 3.20: YES - Start Inhibit enabled;...
  • Page 60 NFS (see Figure 2-5) 2 or 6 3 or 7 4 or 8 Factory Value = 1 Note: Due to the hardware configuration of the 169/169 Plus drawout relay this code cannot be changed on any drawout models without corresponding hardware change.
  • Page 61 SPARE INPUT TRIP TIME DELAY = XXX SEC. (model 169 Plus only) This setpoint is used to set the time delay for the operation of the Spare Input Trip function: 1-254 (increments of 1) or OFF - time delay in seconds (OFF disables this function)
  • Page 62 '(6&5,37,21 ADDRESSED SLAVE = XXX Seen only when relay is chosen as a MASTER (model 169 Plus only). This setpoint is used to set the address of the SLAVE relay with which the MASTER will communicate (see section 2.18): 1-254 or OFF - address of SLAVE relay (OFF indicates no address). Factory Value = OFF...
  • Page 63 MULTILIN SERVICE CODES This page is used for 169 relay testing both in the field and at the Multilin factory. The first four lines of this page are available to the user for testing the relay once it is installed. The other lines in this page are only accessible to Multilin service personnel by entering an access code.

  • Page 64: Help Mode

    Only one type of relay trip can occur at any one time. However, a trip and an alarm or multiple alarms can occur at the same time. If this is the case the 169 relay display will show the TRIP/ALARM message for the trip or alarm with the highest priority.
  • Page 65 GE Power Management 3 SETUP AND USE Table 3-4: TRIP/ALARM MESSAGES AND FAULT DIAGNOSIS /(9( ,1)250$7,21 /,1( (;3/$1$7,21 ',$*126,6 5()  Problem in A/D circuit detected by Return relay for service. SELF-TEST ALARM  internal self-test. Service A/D H/W FAIL required.
  • Page 66 GE Power Management 3 SETUP AND USE /(9( ,1)250$7,21 /,1( (;3/$1$7,21 ',$*126,6 5()  Total number of motor starts over Reduce number of starts during STARTS/HOUR TRIP the past hour greater than normal motor operation. LOCKOUT TIME = XXX MIN.

  • Page 67: Phase Ct And Motor Full Load Current Setpoints

    If more than 5 starts/hour are allowed this setpoint should be stored as "OFF". The relay starts/hour counter will be saved if power is lost to the unit. Note that the 169 relay must detect all motor start attempts (see section 3.8) in order for this function to operate correctly.

  • Page 68: Unbalance Setpoints

    For phase currents above 100% FLC, the 169 relay calculates the ratio of the negative to positive sequence currents (In/Ip) and uses this ratio in two separate protective functions . It is used to bias the thermal memory of the relay which represents the thermal capacity of the motor as a whole (this can be enabled in SETPOINTS mode, page 5, 169 Plus only), and it is used for separate unbalance protection.

  • Page 69: Ground Fault (Earth Leakage) Setpoints

    (time delays) may also be set. The ground fault trip can be instantaneous, or up to 20.0 seconds of time delay can be chosen to allow the 169 relay to be coordinated with other protective devices and switchgear.

  • Page 70: Rapid Trip / Mechanical Jam Setpoints

    3.16 Stator RTD Setpoints The 169 relay has 6 sets of 4 terminals available for the connection of RTDs to monitor the temperature of the stator windings. If fewer than 6 RTDs are to be used they should be connected to the lowest numbered RTD connections on the rear of the relay.

  • Page 71: Other Rtd Setpoints

    3.17 Other RTD Setpoints A total of 8 RTD inputs is provided on the model 169 with 10 on the 169 Plus. Any RTD inputs not used for stator RTD protection can be used for other temperature monitoring functions. These will commonly be used for motor and load bearings.

  • Page 72: Table 3-5 Standard Overload Curve Trip Times (In Seconds)

    GE Power Management 3 SETUP AND USE Table 3-5 Standard Overload Curve Trip Times (in seconds) Overload MULTILIN STANDARD CURVE NUMBERS Level 1.05 1707 2560 3414 5975 7682 10243 12804 1.10 1250 1666 2916 3750 5000 6250 1.20 1392 1789...
  • Page 73 GE Power Management 3 SETUP AND USE Figure 3-2 Standard Overload Curves...
  • Page 74 GE Power Management 3 SETUP AND USE Figure 3-3 Custom Curve Examples...

  • Page 75: Phase Reversal Protection

    3 phase currents. The biasing factor is derived from the amount of negative sequence current flowing in the motor (on a 169 Plus if the U/B input to TC is enabled). The rate at which the memory fills is thus dependent on the amount of overload, unbalance present, as well as RTD bias.
  • Page 76 In this way the 169 provides increased accuracy in the thermal modeling of the protected motor. When RTD #8 (RTD #10 on the 169 Plus) is used for ambient air temperature monitoring even greater thermal protection is provided since the cooling air temperature is known. In this case the learned cool times are based on the difference between the ambient temperature and the average stator RTD temperature.

  • Page 77: Emergency Restart

    If the "ENABLE AUTO-RESET OF START TRIPS?" setpoint is enabled then the relay will automatically reset once the lockout time has elapsed. Before the 169 Plus relay has learned the actual Start Capacity required by the motor this value will default to 40%. 3.21 Emergency Restart When production or safety considerations become more important than motor protection requirements it may be necessary to restart a faulted motor.

  • Page 78: 169 Relay Self-Test

    On the model 169 Plus statistical data is found on page 4 of ACTUAL VALUES mode. All of this data can be cleared to zero by storing a value of YES in response to the "START NEW COMMISSIONING?" question at the end of page All of the statistics in this page will reset to zero after reaching 255.

  • Page 79: Factory Setpoints

    3 SETUP AND USE 3.25 Factory Setpoints When the 169 relay is shipped it will have all setpoints stored in its non-volatile memory. The factory setpoints represent values for an average large three phase motor. The preset Relay and System Configurations represent the most common output relay configurations and attributes.
  • Page 80 GE Power Management 3 SETUP AND USE Table 3-6 Pre-stored Factory Setpoints (169 Setpoint pages 1 to 3) INFORMATION LINE FACTORY INFORMATION LINE FACTORY INFORMATION LINE FACTORY VALUE VALUE VALUE PAGE 1: SETPOINT VALUES IMMEDIATE OVERLOAD RTD #10 TRIP LEVEL MOTOR AMPS SETPOINTS LEVEL = X.XX X FLC...

  • Page 81: Table 3-7 Preset Factory Relay Configurations And Functions

    Stator RTD Trip RTD Trip G/F Trip Phase Reversal Trip Acceleration Time Trip Starts/Hour Trip Speed Switch Trip Differential Relay Trip Spare Input Trip Start Inhibit Model 169 only X Function programmed ON Model 169 Plus only # Function programmed OFF...

  • Page 82: Primary Injection Testing

    CTs. To do this a primary (high current) injection test set is required. Operation of the entire relay system, except the phase CTs can be checked by applying input signals to the 169 relay from a secondary injection test set as described in the following sections.
  • Page 83 GE Power Management 4 RELAY TESTING Figure 4-1 Secondary Injection Test Set (AC input to 169 relay)
  • Page 84 GE Power Management 4 RELAY TESTING Figure 4-2 Secondary Injection Test Set (DC input to 169 relay)

  • Page 85: Ground Fault Current Functions

    The ground fault current function uses digital current information converted from the analog ground fault CT input. The 169 relay must read the injected ground fault current correctly in order for the ground fault function to operate properly. Using factory default setpoints to test the ground fault input circuitry, pass a phase current conductor through the ground fault CT window as shown in figure 4-1.

  • Page 86: Analog Current Output

    To test the operation of the 169 output relays and the switchgear connected to them the "EXERCISE: XXXXX RELAY" setpoint in page 6 of SETPOINTS mode can be used. The motor must be stopped in order for this function to operate.

  • Page 87: Hardware

    Three phase CTs are used to scale the incoming current signals to the 169 relay. The currents are then rectified and fed through fixed burdens to produce a voltage signal of 430 mV peak / FLC. This signal is then multiplexed. The multiplexed signal is buffered and fed to an A/D converter.
  • Page 88 GE Power Management 5 THEORY OF OPERATION Figure 5-1 Hardware Block Diagram...

  • Page 89: Firmware

    GE Power Management 5 THEORY OF OPERATION 5.2 Firmware All mathematical, logic and control functions are performed on an 8031 microcomputer by a program stored on a separate EPROM. The program execution flow is shown in the firmware block diagram of figure 5-2.
  • Page 90 GE Power Management 5 THEORY OF OPERATION Figure 5-2 Firmware Block Diagram...

  • Page 91: 169 Relay Powered From One Of Motor Phase Inputs

    169 relay protecting the motor may or may not be able to trip out the motor. For example, if a 120 VAC 169 relay is set to trip after 0.5 seconds of an 8.0 XFLC short circuit current, the input voltage must remain above 90 VAC for at least 0.5 seconds after the short circuit has occurred or else the 169 relay will not...

  • Page 92: Example Using Flc Thermal Capacity Reduction Setpoint

    GE Power Management 6 APPLICATION EXAMPLES 6.3 Example Using FLC Thermal Capacity Reduction Setpoint The purpose of the FLC Thermal Capacity Reduction Setpoint is to accurately reflect the reduction of thermal capacity available (increase the thermal capacity used) in a motor that is running normally (100% of FLC or less).
  • Page 93 Fail-safe - Refers to the configuration of an output relay. When a fail-safe relay is in the no trip/no alarm (inactive) state its coil will be energized (i.e. have a voltage across it). Thus when control power is removed from the 169 all fail-safe output relays will go to the active state.
  • Page 94 GE Power Management GLOSSARY MULTILIN RELAY WARRANTY Multilin warrants each relay it manufactures to be free from defects in material and workmanship under normal use and service for a period of 24 months from date of shipment from factory. In the event of a failure covered by warranty, Multilin will undertake to repair...

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