THOMSON MEC 20 - V1.82 Service Manual
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THOMSON MEC 20 - V1.82 Service Manual

Microprocessor engine/generator controller (with remote communication, expansion output module & eap 110 remote annunciator options)
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MEC 20
MICROPROCESSOR
ENGINE/GENERATOR CONTROLLER
(WITH REMOTE COMMUNICATION, EXPANSION OUTPUT MODULE &
EAP 110 REMOTE ANNUNCIATOR OPTIONS)
INSTALLATION, OPERATING &
SERVICE MANUAL

Software Version 1.82

PM047 Rev 13 05/03/30
th
9087A – 198
Street, Langley, BC Canada V1M 3B1
Telephone (604) 888-0110
Telefax (604) 888-3381
E-Mail: info@thomsontechnology.com
www.thomsontechnology.com

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January 21, 2025

How to reset the low fuel level alarm?

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Summary of Contents for THOMSON MEC 20 - V1.82

  • Page 1: Software Version

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER (WITH REMOTE COMMUNICATION, EXPANSION OUTPUT MODULE & EAP 110 REMOTE ANNUNCIATOR OPTIONS) INSTALLATION, OPERATING & SERVICE MANUAL Software Version 1.82 PM047 Rev 13 05/03/30 9087A – 198 Street, Langley, BC Canada V1M 3B1 Telephone (604) 888-0110 Telefax (604) 888-3381 E-Mail: info@thomsontechnology.com...

  • Page 3: Table Of Contents

    2.9. REMOTE START CONTACT FIELD WIRING 2.10. REMOTE COMMUNICATION WIRING 2.11. EXPANSION OUTPUT MODULE LOCATION/INSTALLATION 2.12. MEC MOUNTING LOCATION/INSTALLATION 2.13. FACEPLATE MOUNTING DIMENSIONS 2.14. MEC 20 ASSEMBLY - SIDE VIEW 2.15. DIELECTRIC TESTING DESCRIPTION PM047 Rev 12 03/03/04 Thomson Technology...
  • Page 4 INTERNAL FAULT CIRCUITS 4.3. DIGITAL FAULT INPUT CIRCUITS 4.4. ANALOG FAULT INPUT CIRCUITS CONTROL OUTPUT CONTACT DESCRIPTIONS 5.1. RUN, CRANK, COMMON FAIL OUTPUT CONTACTS 5.2. PROGRAMMABLE OUTPUT CONTACTS REMOTE COMMUNICATION OPTION EXPANSION OUTPUT MODULE OPTION EAP 110 REMOTE ANNUNCIATOR OPTION OPERATING INSTRUCTIONS 9.1.
  • Page 5 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER 10.2. BASIC PROGRAMMING OPERATION 10.3. MAIN PROGRAMMING MENU 10.4. ANALOG FAULT PROGRAMMING MENU 10.5. DIGITAL FAULT PROGRAMMING MENU 10.6. CALIBRATION MENU PROGRAMMING SHEETS 11.1. SUMMARY CONFIGURATION DATA SHEET 11.2. MAIN CONFIGURATION 11.3. ANALOG FAULT PROGRAMMING MENU 11.4.
  • Page 6 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER...

  • Page 7: Introduction

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER INTRODUCTION 1.1. PRODUCT REVISION HISTORY The following information provides an historical summary of changes made to this product since the original release. 1.1.1. Software Version Revised Idle Control Logic for Digital Inputs #1,2 1.82 05/03/30...
  • Page 8 1.7 02/02/15 Key changes implemented as follows: • Auto Mains Failure (AMF) logic with new timers, control outputs and display features • Line to Neutral AC Voltage Display on 3 Phase 4 Wire Systems (neutral connection required) • Analog Shutdown Capability...

  • Page 9: General Description

    All standard and optional features of the MEC 20 are configurable from the front panel LCD display and are security password protected. The LCD display screen prompts are in plain English, providing a user-friendly operator interface with many display options available.
  • Page 10 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER all voltage monitoring, current monitoring and timing functions as well as providing many standard features which were previously only available as expensive add-on optional features. The MEC 20 provides the following advanced features: • Up to 28 alarm/shutdown fault circuits utilizing analog and digital inputs.

  • Page 11: Installation

    2.2. BATTERY SUPPLY INPUT The MEC 20 can operate on any battery supply from 10 to 30 volts DC. The battery DC negative or common conductor must be grounded to the main generator-set frame ground. The MEC 20 is internally protected by a solid state type fuse that protects it from inadvertent shorts on the output terminals.

  • Page 12: Speed Sensing Input

    2.4. DC VOLTAGE INPUTS All DC voltage inputs to the MEC 20 are optically isolated and filtered for protection from noise spikes and transients Input wiring must be routed so that it is not near electrically "noisy" wiring such as ignition, starter wires or main AC power conductors. All contacts...

  • Page 13: Ac Voltage Input

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER must be “dry” (i.e. non-powered) and one side must be connected to the common DC negative conductor. 2.5. AC VOLTAGE INPUT The MEC 20 can accept direct AC voltage input from 120-600Vac (nominal). Note: Direct input voltage sensing can only be used when the generator utilizes a single phase 3 wire or 3 phase, 4 wire distribution system with a solidly grounded neutral conductor.

  • Page 14: Ac Current Input

    Note: These outputs will require external overcurrent protection (Maximum 10 Amp). The use of AC or DC operated solenoids or relays in control systems can sometimes cause high voltage spikes on the DC power supply, which may cause electronic devices to fail.

  • Page 15: Remote Start Contact Field Wiring

    2.9. REMOTE START CONTACT FIELD WIRING Field wiring of a remote start contact from a transfer switch to a control panel should conform to the following guidelines to avoid possible controller malfunction and/or damage. 2.9.1. Remote start contact wires (2 - #14 AWG (2.5mm ) should be run in a separate conduit.

  • Page 16: Expansion Output Module Location/Installation

    Technology factory. 2.11. EXPANSION OUTPUT MODULE LOCATION/INSTALLATION The expansion module(s) are to be mounted inside a control panel using four screws with stand-offs provided. The expansion module must be mounted within 300 metres (1000 feet) wiring distance from the MEC 20 using an 8 conductor shielded cable provided with the module.

  • Page 17: Mec Mounting Location/Installation

    Verify that the intended AC voltage input to the controller does not exceed the maximum allowable level on the control panel door as per the applicable control panel certification standard. The MEC 20 controller can be installed onto a door of a control panel using one of the following methods: •...
  • Page 18 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER 268 mm. 126 mm. 126 mm. 9 HOLES 80 mm. 6 mm. DIAMETER (1/4" DRILL) CUTOUT 8 mm. 8 mm. 24 mm. 24 mm. OUTLINE OF PRINTED CIRCUIT BOARD UNDER PANEL DOOR 49 mm. 49 mm.

  • Page 19: Mec 20 Assembly - Side View

    2. The high voltage mylar barrier (P/N TMW;10805;1) must be installed as shown when the MEC 20 is installed onto the door of a control panel. 3. When the MEC 20 is installed on a door without 1” PEM studs, 1” machine screws must be used.

  • Page 20: Dielectric Testing

    2.15. DIELECTRIC TESTING Do not perform any high voltage dielectric testing on the control panel with the MEC 20 connected in the circuit as serious damage will occur to the controller. All AC control fuses connected to the MEC 20 must be removed if high voltage dielectric testing is performed on the control panel.
  • Page 21 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER connected to the main PCB via plug-in ribbon cable. The main features of the Lexan faceplate are described as follows with reference to FIGURE #10. MICROPROCESSOR ENGINE CONTROLLER MEC 20 ALARM READY SHUTDOWN SPEED SIGNAL...
  • Page 22 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER The longer the push-button is held down, the faster the value will be incremented. ENTER push-button. The ENTER function is used to scroll forwards through the status menus or programming prompts to the next item. The ENTER function is used to “enter”...

  • Page 23: Printed Circuit Board

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER 3.2. PRINTED CIRCUIT BOARD The printed circuit board (PCB) is shown in FIGURE #11. The PCB contains the following user interface items: MEC 20 CIRCUIT BOARD LAYOUT MP1 MP2 1 B+ B- GRD R115 RJ45...
  • Page 24 DC power input and ground connection terminal block 3.2.2. DIAGNOSTIC LED’S The MEC 20 controller provides five diagnostics LED lights that are mounted on the rear of the printed circuit board as per FIGURE #11. Their functions are described as follows: 3.2.2.1.

  • Page 25: Fault Circuit Descriptions

    FAULT CIRCUIT DESCRIPTIONS The MEC 20 engine-generator controller utilizes many analog and digital inputs to perform both monitoring and control functions. Three types of fault circuits are used to monitor and control the engine-generator set. The first type is Internal Fault Circuits that are derived from a combination of digital and analog inputs.

  • Page 26: Mec 20 Functional Block Diagram

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER 4.1. MEC 20 FUNCTIONAL BLOCK DIAGRAM FACTORY PROGRAMMED CUSTOMER CONFIGURED FEATURE OUTPUT CONTACTS STANDARD FAULTS FAULTS MAGNETIC OVERSPEED PICKUP SHUTDOWN FAULT LOSS OF SPEED 10A/240Vac, 8A/24Vdc DISPLAY LOGIC ALARM/SHUTDOWN RESISTIVE OVERCRANK SHUTDOWN AUTO PUSHBUTTON SWITCH NOT IN AUTO...

  • Page 27: Internal Fault Circuits

    The loss of speed fault circuit is initiated when the engine’s speed sensing circuit does not detect a speed signal for a period more than 2 seconds following a run signal. The loss of speed fault circuit may be user programmed as a latching shutdown fault or alarm only.

  • Page 28: Digital Fault Input Circuits

    FAIL TO SYNC “Blank” (i.e. no text for unused inputs) Note: Up to six custom ”user defined” fault label names may be specified for the MEC 20 controller at time of purchase. The six custom fault label names cannot be changed once shipped from the factory.

  • Page 29: Analog Fault Input Circuits

    Section 11.3 for further information. 4.4. ANALOG FAULT INPUT CIRCUITS The MEC 20 Engine Controller provides up to fifteen analog fault input circuits that are user programmable. The controller is supplied from the factory with fifteen standard PM047 Rev 13 05/03/30...
  • Page 30 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER analog fault circuits. Each analog fault input circuit is activated via specific analog signal type. Refer to Section 11.3 Analog Fault Programming Menu for the factory default program settings for each analog fault provided. WARNING!!!
  • Page 31 4.4.2. GENERATOR AC VOLTAGE/FREQUENCY/CURRENT 4.4.2.1. GENERATOR UNDERVOLTAGE The MEC 20 controller provides a 3-phase undervoltage sensor for the generator supply. The undervoltage sensor is programmable for type of fault action (i.e. alarm or shutdown), pickup and dropout voltage setpoints (i.e. adjustable hysteresis) and transient time delay settings. Refer to the programming instructions for further information.
  • Page 32 (i.e. open or shorted signal). In case of a sender or wiring failure, the MEC 20 will display zero or 9999 °C and will initiate an...
  • Page 33 (i.e. open or shorted signal). In case of a sender or wiring failure, the MEC 20 will display zero or 9999 PSI and will initiate an...

  • Page 34: Control Output Contact Descriptions

    Refer to the programming instructions for further information. CONTROL OUTPUT CONTACT DESCRIPTIONS All output contacts from the MEC 20 Engine Controller are non-powered (i.e. dry contacts) and are rated 10A/240Vac, 8A/24Vdc resistive (3A inductive, 0.4pf). Output contacts are not fused therefore external overcurrent protection (maximum 10A) is required for all control circuits using these contacts.

  • Page 35: Run, Crank, Common Fail Output Contacts

    5.1.1. RUN OUTPUT The Run output contact is a Form “A” dry contact and is used to control the engines “run” circuit. This typically includes external control devices such as “fuel rack solenoids” or electronic governors’. Note: An additional pilot relay will be required to energize high current devices that exceed the 10A resistive rating.
  • Page 36 The output contact would typically be connected to the “idle/run” input control of an electronic governor. Note: The controller receives an idle signal from a digital input contact that must additionally be programmed for an idle function. During an idle condition, the engine...
  • Page 37 The preheat output is typically used for an engine starting aid such as glow plugs. Note: An external pilot relay is required to switch the high current glow plug load.
  • Page 38 The designated programmable output relay will energize when the remote start input has not been activated (i.e. contact on terminals 16 & 17 is not closed) and the Return Delay & Neutral Delays have expired (if programmed). The output will de-energize when the remote start input has been activated and the Engine Start Delay &...
  • Page 39 The designated programmable output relay will energize when a load test operating mode is selected via the front keypad push-button. Once initiated, the engine will receive a start signal from the transfer switch and upon the generator reaching nominal voltage and frequency levels, a load transfer will be initiated.

  • Page 40: Remote Communication Option

    (PC). PC’s may be connected locally via serial communication cable to the MEC 20 or remotely via modem and telephone systems. Remote communication can be via customer supplied equipment or an external communication interface module (CIM) as manufactured by Thomson Technology.
  • Page 41 Personal Modem i t f r o m s o u r c e s o f e l e c t r i c a l Computer interference. Refer to installation section for further information.
  • Page 42 PC or to a remote PC via telephone system and CIM module. Refer to FIGURE #15 for a typical MEC 20 network system with CIM module.

  • Page 43: Expansion Output Module Option

    PROGRAMMABLE MODULE ADDRESS (REMOVE JUMPER FOR STANDARD C282/NFPA FAULTS,ADD JUMPER FOR ADDITIONAL FAULTS) CONTACT LOGIC IS INDIVIDUALLY PROGRAMMABLE VIA PIN JUMPERS (CONTACT TO OPEN OR CLOSE W HEN FAULT ACTIVATED) PROGRAMMABLE CONTACT - USER CONFIGURED FUNCTION VIA MEC 20 SOFTW ARE (REFER TO MEC 20 LITERATURE) "GRD"...
  • Page 44 Contact configuration is via circuit board mounted jumper pins and clips. Refer to FIGURE #18 for jumper pin location and configuration settings. Each output contact is rated maximum 0.5A 120Vac, 1.0A 30Vdc resistive.
  • Page 45 C282 or NFPA 110 standard faults exclude analog faults Over/Under voltage, Over/Under Frequency, Overcurrent, spare digital inputs #5-#12 and programmable output #6 (i.e. must specify second expansion module to obtain contacts for these faults). G:\ENGINEER\PRODUCTS\MEC20\MEC20_17.VSD...

  • Page 46: Eap 110 Remote Annunciator Option

    & monitoring signals between the engine controller and remote annunciator. Up to 20 individual fault conditions are remotely monitored utilizing both visual LED lights & audible alarm annunciation. The EAP 110 is DC powered from the same 12 or 24V engine starting battery as the engine controller is connected to.

  • Page 47: Operating Instructions

    9.1. MEC 20 POWER-UP OPERATION SEQUENCE When the MEC 20 is first energized with DC supply voltage at terminals B+ & B-, the controller will power-up into a fail-safe mode, preventing possible engine operation. The controller will default to an Emergency Stop failure mode and must be manually reset before the controller is put into normal operation.
  • Page 48 BATTERY VOLTAGE/ENGINE SPEED (TACH) ENGINE TEMPERATURE/OIL PRESSURE PROGRAM MENU 9.2.1. OPERATING STATUS MENU The operating status menu provides the operator with detailed information as to the status of the engine-generator set. NOTE: The operating status screen may be momentarily replaced with a time delay countdown screen when a start or stop sequence is initiated.
  • Page 49 UNIT SHUTDOWN UNIT ALARM 9.2.1.1. UNIT READY This indicates that the controller is in “Auto” position and there are no active shutdowns or alarms. 9.2.1.2. SWITCH IN OFF This indicates that the controller has been selected to the “off” position from the front panel keypad push-button.
  • Page 50 ENGINE START DELAY 45 SEC Displays specific time delay function currently in operation Displays current time in seconds or minutes that are left in the specific timing sequence. NOTE: During a timer countdown sequence, a different display screen may be selected by pressing the “ENTER”...
  • Page 51 532.31 9.2.4.3. GENERATOR PHASE VOLTAGE DISPLAY (LINE TO LINE) The generator phase voltage screen allows the operator to view the generator AC voltage on all 3 phases (or single phase system as selected). LCD DISPLAY PM047 Rev 13 05/03/30 Thomson Technology...
  • Page 52 (LINE TO NEUTRAL) The generator phase/neutral display allows the operator to view the generator line to neutral voltage for all 3 phases of the system. Note: The generators neutral must be connected to MEC 20 terminal TB1-VN and the “neutral connected” prompt in the main program menu must be selected as “Yes”.
  • Page 53 LCD DISPLAY BATTERY 27.0Vdc SPEED 1800rpm Displays battery voltage in DC volts. The voltage is displayed with a resolution of 1/10 of a volt. Displays engine speed in revolutions per minute (RPM). PM047 Rev 13 05/03/30 Thomson Technology...

  • Page 54: Sequence Of Operation

    OIL PRESS 200 KPA Displays engine temperature in either degrees Celsius or Fahrenheit (as selected). Displays engine oil pressure in either pounds per square inch (PSI) or in Kilopascals (KPA) (as selected). 9.2.6. PROGRAM MENU The programming menu is used to access the MEC 20’s programmable functions such as time delays, analog fault settings, digital fault settings and calibration.
  • Page 55 When the “RUN” push-button on the front faceplate keypad is pressed, an ENGINE START DELAY timer will be initiated. Note: The start sequence will not be initiated if any shutdown fault condition is present. Once the engine start delay time expires, an engine RUN and CRANK output signal will be initiated.
  • Page 56 When the controller is applied in an Auto Mains Failure (AMF) application with a transfer switch, it must be wired as per FIGURE 21 shown at the end of this section. Programmable output #3 must be selected for Utility Ready To Load and programmable output #4 must be selected for Gen Ready To Load.
  • Page 57 Engine starts following expiry of the Engine Start Delay timer (Utility Ready To Load output stays energized) • Once the engine has started and the generator output rises above the programmed voltage and frequency limits, a warm-up timer is initiated.
  • Page 58 • Engine starts following expiry of the Engine Start delay timer • Once the engine has started and the generator output rises above the programmed voltage and frequency limits, a warm-up timer is initiated. •...
  • Page 59 9.3.5.5. NO LOAD TEST: To allow a timed No Load Test of the engine/generator set while using the AMF control application, a digital input contact from an external timer must be programmed for NO LOAD Test (Refer to Section 10.5.8 for programming details).
  • Page 60 PROGRAMMABLE OUTPUT #3 MUST BE PROGRAMMED FOR "UTILITY READY TO LOAD" PROGRAMMABLE OUTPUT #4 MUST BE PROGRAMMED FOR "GENERATOR READY TO LOAD" ALL COMPONENTS SHOWN EXTERNAL TO THE MEC 2 / MEC 20 ARE OPTIONAL ITEMS 3 POLE CHANGEOVER SWITCH SHOWN...

  • Page 61: Control Push-Buttons

    In this position, the engine will start and operate continuously providing no shutdown circuits are active. All protective circuits will be operative in this mode. There will be no cooldown cycle at the end of a manual run sequence. 9.4.1.2.
  • Page 62 9.4.5. LAMP TEST A lamp test feature is provided to test all software controlled LED lights as well as the LCD display. To activate the lamp test feature, simultaneously push the INCREMENT and DECREMENT push-buttons. The LED’s and LCD display will illuminate for approximately 2 seconds then return to their original status.

  • Page 63: Programming Instructions

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER PROGRAMMING INSTRUCTIONS 10.1. SECURITY PASSWORDS Access to the programmable parameters of the MEC 20 Controller is via a security password number. Three security password levels are provided as described below: 10.1.1. READ ONLY MODE User can view the programmable parameters only and cannot change any values.

  • Page 64: Basic Programming Operation

    The EXIT push-button may be used to scroll backwards through the programming parameter loops. To change a programmed parameter, use the INCREMENT or DECREMENT push- buttons to scroll through the available options or to adjust a value up or down to the PM047 Rev 13 05/03/30 Thomson Technology...

  • Page 65: Main Programming Menu

    The programming prompts are listed in order as they appear in the MEC 20 software. To program the specific MAIN MENU items, refer to the following descriptions: 10.3.1.
  • Page 66 10.3.7. CURRENT SENSING RATIO For current sensing wiring connections from current transformers (CT’s), enter the calculated CT ratio (e.g. when using a 600:5 CT, enter a number of “120”). 10.3.8. TEMPERATURE SCALE Select the desired type of engineering units for the engine temperature display and analog setpoints as provided: Degrees Fahrenheit or Degrees Celsius.
  • Page 67 Note: This value will be ignored if only one attempt has been programmed. 10.3.13. STARTER RE-ENGAGE DURATION This feature will check for a speed signal while cranking. If no speed signal is sensed, the controller assumes that the engine starter is not turning the engine over (for whatever reason), and disengages it after the programmed time delay, and re-engages it again.
  • Page 68 If selected, ensure that the speed signal is not less than 3.0Vac from the magnetic pick up while the engine is cranking. Note: If this feature is disabled, no overspeed protection or crank disconnect will be provided if the speed signal fails.
  • Page 69 10.3.23. LOSS OF SPEED SIGNAL Select the desired action (i.e. alarm or shutdown) when a loss of speed signal is detected during operation. Note: A loss of speed signal must be detected for longer than 2 seconds to initiate the desired action.
  • Page 70 The Neutral Delay timer ensures the load voltages decay before the transfer is initiated. Set to the desired time in seconds. The Neutral Delay timer is typically set for 3 seconds. Refer to Section 9.3 for further details on this timing function.
  • Page 71 (i.e. common shutdown, common fail or common alarm) which will initiate an automatic call out to a remote communication device. 10.3.31. POST-LUBE DURATION Program the desired post lube duration in minutes (0 - 999) for postlube duration function. PM047 Rev 13 05/03/30...

  • Page 72: Analog Fault Programming Menu

    10.3.32. CYCLE LUBE INTERVAL A cyclic lube function can be set up to circulate oil through the engine several times per day while the engine is not running. A non-zero post-lube duration must be entered to enable the lube output. Select the desired cycle lube interval (i.e.

  • Page 73: Digital Fault Programming Menu

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER 10.4.3. ALARM LATCH If an alarm fault was programmed, it may be selected as a ”latching” alarm or “non-latching”. When “latching” is selected, it will not un-latch until a reset command clears it. Note: This programming prompt only appears if alarm faults are programmed.
  • Page 74 Note: This programming prompt only appears if alarm faults are programmed. Shutdown faults are automatically set as latching. 10.5.4. POLARITY This setting allows the digital fault circuit to be set for Open to Fail or Close to Fail sensing contacts. 10.5.5. BYPASS ON START DELAY This allows the alarm or shutdown circuit to be disabled until after the bypass timer has expired.
  • Page 75 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER 10.5.6. TRANSIENT DELAY TIMES This allows the selected fault circuit to be inhibited from being activated until the specified time delay period has expired. Delay times from 0.0 to 999.9 seconds are available by entering the time required.

  • Page 76: Calibration Menu

    10.6.1. GENERAL AC Voltage, AC current and battery voltage analog circuits are factory calibrated before the product is shipped therefore these circuits should not require any field calibration. Should field calibration be required refer to the applicable procedure as described further in this section.
  • Page 77 (i.e. phase to phase or phase to neutral) with the ZERO function selected. Use the INCREMENT or DECREMENT push-buttons to adjust the correction factor number to obtain zero volts on the right hand side of the display as confirmed with the external voltmeter. The factory default correction factor is 127.
  • Page 78 Use the INCREMENT or DECREMENT push-buttons to adjust the correction factor number while observing the displayed voltage level on the MEC 20. Adjust the correction factor number to obtain an identical voltage reading as measured with the external AC voltmeter.
  • Page 79 10.6.4. CURRENT SENSING CALIBRATION CURRENT A ZERO 350A Displays the generator’s load current (phase A, B or C) to be calibrated. Displays the type of calibration function, either ZERO or SPAN. Displays the calibration correction factor number (0-255) used to obtain the correct current reading.
  • Page 80 Repeat the above procedure for all remaining generator current phases. 10.6.5.2. SPAN CALIBRATION Apply 50%-100% load to the generator set. Note: It is recommended to load the generator set to 100% rated load for calibration purposes to obtain good accuracy throughout the full span of operation.
  • Page 81 Displays the calibration correction factor number (0-255) used to obtain the correct voltage reading. Displays the actual battery voltage measurement that will be the same value as shown on the MEC 20 display menu. This voltage reading may be calibrated higher or lower by changing the correction factor number.
  • Page 82 Temperature or Pressure reading. Displays the actual temperature or pressure measurement that will be the same value as shown on the MEC 20 display menus. This reading may be calibrated higher or lower by changing the correction factor number.
  • Page 83 MEC 20. The calibration procedure is to be done only at a single point, which is the normal operating temperature of the engine. Connect a temporary engine mounted temperature gauge of suitable accuracy and start the engine.
  • Page 84 MEC 20. The calibration procedure is to be done only at a single point, which is the normal operating pressure of the engine. Connect a temporary engine mounted pressure gauge of suitable accuracy and start the engine.
  • Page 85 6284 Sender resistance data shown are for Oil Pressure Sender p/n-003654 (Thomson p/n), Manufacturer- Datcon, p/n 102227. Datcon Sender must be used with MEC software version 1.81 or greater (previous software versions cannot be used). Figure 22 PM047 Rev 13 05/03/30...

  • Page 86: Programming Sheets

    Programmable #4 – Form C Engine Running (Std Default) or Custom ________________________________ Programmable #5 – Form A/B EPS Supplying Load/Engine Running (Std Default) or Custom _______________ (EAP 110/MEC 20 Exp –Group 1 Only) Programmable #6 – Form A/B] Disabled (Std Default) or Custom _____________________________________ (EAP 110/MEC 20 Exp –Group 2 Only)

  • Page 87: Main Configuration

    LINE TO LINE VOLTAGE XXXXX VAC 120-15000VAC SYSTEM FREQUENCY 50HZ/60HZ TOGGLE BETWEEN 50/60 HZ SYSTEM PHASES 1 PHASE/3 PHASE TOGGLE BETWEEN 1 & 3 PHASE NEUTRAL CONNECTED TOGGLE BETWEEN YES/NO VOLTAGE SENSING VOLTAGE SENSING PT RATIO RATIO ENTER NUMBER 1-208 (1=DIRECT) CURRENT SENSING...
  • Page 88 BYPASS DELAY XX SECONDS 0-99 SECONDS COOLDOWN DELAY XX SECONDS 0-9999 SECONDS NOMINAL RPM XXXX RPM 0-4000RPM FLYWHEEL TEETH ENGINE SPEED SENSING VIA MAGNETIC PICK UP 0-999 TEETH CRANK DISCONNECT XX PERCENT 0-100% OVERSPEED XX PERCENT 100-150% OVERSPEED TRANSIENT X.X SEC 0.0-9.9 SEC...
  • Page 89 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER MAIN PROGRAMMING MENU PROG OUTPUT #4 PROG OUTPUT #5 PROG OUTPUT #6 WARMUP DELAY 0 – 99 SECONDS NEUTRAL DELAY 0 – 99 SECONDS RETURN DELAY 0 – 999 SECONDS RESET RUN HOURS ACCESS VIA MASTER PASSWORD ONLY...

  • Page 90: Analog Fault Programming Menu

    TEMP #1 ALARM TEMP HIGH ENG 206°F SENDER TEMP #2 SHUTDOWN PRESS 30PSI LOW OIL SENDER PRESS#1 ALARM PRESS 20PSI LOW OIL SENDER PRESS#2 SHUTDOWN * Indicates feature is non-programmable (i.e. is fixed) in software PM047 Rev 13 05/03/30 Thomson Technology...

  • Page 91: Digital Fault Programming Menu

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER 11.4. DIGITAL FAULT PROGRAMMING MENU TYPICAL PROGRAM FACTORY DEFAULT SETTINGS DIGITAL FAULT PROGRAMMING MENU FAULT INPUT # ACTION ALARM POLARITY BYPASS ON TRANSIENT START DELAY NAME S=SHUTDOWN LATCH O=OPEN A=ALARM C=CLOSE Y=YES (SEC) Y=YES N=NO...

  • Page 92: Calibration Menu

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER 11.5. CALIBRATION MENU CALIBRATION MENU VOLTS ZERO XXXVAC VOLTS SPAN XXXVAC VOLTS ZERO XXXVAC VOLTS SPAN XXXVAC VOLTS ZERO XXXVAC VOLTS SPAN XXXVAC VOLTS ZERO XXXVAC VOLTS SPAN XXXVAC VOLTS ZERO XXXVAC VOLTS SPAN XXXVAC...

  • Page 93: Specifications

    • Power supply: 10 to 30Vdc, negative ground • Operating temperature: -15°C to +50°C Extended temperature ratings are available using the VFD display option. Extended ratings are: Operating -40°C to +70°C, Storage -50°C to +85°C • Environmental (Faceplate): NEMA 12 •...

  • Page 94: Connection Diagram

    NOTES: CONTACTS RATED MAXIMUM 10A/240Vac, 8A/24Vdc RESISTIVE LOGIC IS SOFTWARE PROGRAMMABLE FOR OPEN OR CLOSE ON FAIL GENERATOR SUPPLY MUST UTILIZE A SOLIDLY GROUNDED NEUTRAL SYSTEM – REFER TO INSTRUCTION MANUAL FOR ALTERNATE CONNECTIONS ENGINE MOUNTED COMPONENTS "GRD" CONNECTION TO BE MADE TO COMMON CHASSIS/ENCLOSURE GROUND BOND SYSTEM G:\ENGINEER\PRODUCTS\MEC20_04.VSD...

  • Page 95: Trouble Shooting

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER TROUBLE SHOOTING A number of problems can cause the MEC 20 controller not to function properly. Refer to the following list of typical problems. Consult the factory for any detailed information or for any problems not listed.
  • Page 96 Verify correct magnetic pick- up signal at cranking (2.0VAC min.). - Check that the RUN output LED (on the rear of the PCB) is on. If yes, verify relay contact operation on terminals #18 & #19.
  • Page 97 MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER SYMPTOM (CONT’D) CORRECTIVE ACTION (CONT’D) Engine temperature or oil pressure displays - Check the wiring from the MEC 20 terminal #37 & 9999 #38 to the engine mounted sender are correct (i.e. wiring is not open or shorted).

  • Page 98: Notes

    MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER NOTES PM047 Rev 13 05/03/30 Thomson Technology...

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