THOMSON MEC 2 - V1.4 User manual
9087A – 198th Street, Langley, BC Canada V1M 3B1 Telephone (604) 888-0110
MEC 2
MICROPROCESSOR
ENGINE/GENERATOR CONTROLLER
(WITH EAP 110 REMOTE ANNUNCIATOR OPTIONS)
INSTALLATION, OPERATING &
SERVICE MANUAL
Software Version 1.4
PM056 Rev 6 05/10/15
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 3Thomson Technology
CONTENTS
1. INTRODUCTION 1
1.1. PRODUCT REVISION HISTORY 1
1.2. GENERAL DESCRIPTION 3
2. INSTALLATION 4
2.1. GENERAL INFORMATION 4
2.2. BATTERY SUPPLY INPUT 4
2.3. SPEED SENSING INPUT 5
2.4. DC VOLTAGE INPUTS 6
2.5. AC VOLTAGE INPUT 6
2.6. AC CURRENT INPUT 8
2.7. OUTPUTS 8
2.8. EXTERNAL PANEL CONTROL WIRING 8
2.9. REMOTE START CONTACT FIELD WIRING 9
2.10. MEC MOUNTING LOCATION/INSTALLATION 9
2.11. FACEPLATE MOUNTING DIMENSIONS 10
2.12. MEC 2 ASSEMBLY - SIDE VIEW 11
2.13. DIELECTRIC TESTING 12
3. DESCRIPTION 13
3.1. LEXAN FACEPLATE 13
3.2. PRINTED CIRCUIT BOARD 15
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 4Thomson Technology
4. FAULT CIRCUIT DESCRIPTIONS 17
4.1. MEC 2 FUNCTIONAL BLOCK DIAGRAM 18
4.2. INTERNAL FAULT CIRCUITS 19
4.3. DIGITAL FAULT INPUT CIRCUITS 20
4.4. ANALOG FAULT INPUT CIRCUITS 21
5. CONTROL OUTPUT CONTACT DESCRIPTIONS 26
5.1. RUN, CRANK OUTPUT CONTACTS 26
5.2. PROGRAMMABLE OUTPUT CONTACT 27
6. EXPANSION OUTPUT MODULE OPTION 30
7. EAP 110 REMOTE ANNUNCIATOR OPTION 34
8. OPERATING INSTRUCTIONS 35
8.1. MEC 2 POWER-UP OPERATION SEQUENCE 35
8.2. MEC 2 DISPLAY MENUS 35
8.3. SEQUENCE OF OPERATION 43
8.4. CONTROL PUSHBUTTONS 49
9. PROGRAMMING INSTRUCTIONS 50
9.1. SECURITY PASSWORDS 50
9.2. BASIC PROGRAMMING OPERATION 52
9.3. MAIN PROGRAMMING MENU 53
9.4. ANALOG FAULT PROGRAMMING MENU 59
9.5. DIGITAL FAULT PROGRAMMING MENU 60
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 5Thomson Technology
9.6. CALIBRATION MENU 62
10. PROGRAMMING SHEETS 73
10.1. SUMMARY CONFIGURATION DATA SHEET 73
11. MAIN CONFIGURATION 74
11.1. ANALOG FAULT PROGRAMMING MENU 76
11.2. DIGITAL FAULT PROGRAMMING MENU 77
11.3. CALIBRATION MENU 77
12. SPECIFICATIONS 80
13. CONNECTION DIAGRAM 81
14. TROUBLE SHOOTING 82
15. NOTES 85
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
1
1. INTRODUCTION
1.1. PRODUCT REVISION HISTORY
The following information provides an historical summary of changes made to this
product since the original release.
Software Version
1.4 05/10/15 Added AC protection faults Under/Over Voltage, Under/Over
Frequency and Over Current
Revised Idle circuit operation with digital faults #1 & 2
1.31 03/03/04 Changed Oil Pressure Sender Manufacturer requiring revised
pressure/resistance calibration data
New Oil Pressure Sender Thomson p/n-003654, Manufacturer-
Datcon, p/n 102227.
Discontinued Oil Pressure Sender Thomson p/n-000772,
Manufacturer- Isspro, p/n R9279C
Note: The oil pressure senders are not interchangeable with the
software versions.
1.3 02/09/09 Added Programmable Output Feature “EPS Supplying Load”
Added Digital Input Feature “No-Load Test”
Added New Digital Fault Names
Basin Rupture
ATS in Bypass
Fuel Leak
Vent Damper Fail
High Fuel Level
Low Fuel Press
Bat Charger Fail
Fail to Sync
HighIntkManfTemp
Added Independent Programming features for AMF Outputs
Added references for EAP 110 Remote Annunciator
Misc. Display & Menu changes
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
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1.2 02/01/31 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 from Oil Pressure and
Temperature Senders
Expanded oil pressure operation up to 150 PSI (was 100 PSI)
Single Point Calibration for Oil Pressure/engine temperature
sender inputs (simplified calibration, field calibration is now
mandatory)
3 Additional Programmable Outputs #2, #3, #4 Enabled
Programmable Output features now expanded to map to every
available fault circuit
Add new Programmable Output features Engine Ready &
Engine Run (Fuel)
Expansion Port Enabled for optional relay expansion board
There were also minor changes that are reflected in the manual.
1.1 01/07/24 Add “Ready to Load”; changes in temperature and pressure
calibrations; extended temperature
1.0 01/01/31 Original version
Operating & Service Manual Version
Rev 6 05/10/15 Added AC protection faults Over/Under Voltage, Over/Under
Frequency and Over Current for software version 1.4
Rev 5 03/03/04 Changed Oil pressure/resistance calibration data and new software
version 1.31.
Rev 4 02/09/09 Added descriptive information for new software version 1.3
Rev 3 02/01/31 Added descriptive information for new software version 1.2
Rev 2 01/07/25 Addition of “Static Precaution”; deletion of calibration jumpers to
requiring external calibration resistors/potentiometers; Ready status
changes to “Ready to Load”; changes in temperature and pressure
calibrations; extended temperature ratings.
Rev 1 01/02/15 Minor corrections.
Rev 0 01/01/31 Original release.
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
3
Contact Thomson Technology, to obtain applicable instruction manuals. Soft copy of
most current version is available at www.thomsontechnology.com.
1.2. GENERAL DESCRIPTION
The Thomson Technology MEC 2 Microprocessor-based Engine/Generator Controller
utilizes the latest advancements in microprocessor design technology for the control and
monitoring of engine-generator sets. The MEC 2 provides a comprehensive array of
operational, protection and display features for automatically controlling an
engine/generator set. All standard and optional features of the MEC 2 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. The microprocessor design provides high accuracy for
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 2 provides the following advanced features:
• Up to 15 alarm/shutdown fault circuits utilizing analog and digital inputs.
• Standard model meets or exceeds CSA C282, NFPA 110 Level 1 generator set
control requirements.
• Backlit LCD display screen with alpha-numeric readout for display and programming.
• Digital 3-phase voltage, 3-phase current, KVA and frequency metering for generator
output.
• Non-volatile memory retains logic and setpoints if control power is lost.
• Direct 3-phase voltage sensing inputs on generator supply from 120VAC up to
600VAC (nominal).
• Security password-protected programming levels.
• Self diagnostic features continuously verify processing, I/O and memory circuits.
• Superior EMI/RFI noise immunity and surge performance features as per IEEE
C62.41 requirements.
• Dual microprocessor design provides independent speed sensing circuitry for higher
performance.
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
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This equipment contains static-sensitive parts. Please observe the following anti-static
precautions at all times when handling this equipment. Failure to observe these
precautions may cause equipment failure and/or damage.
• Discharge body static charge before handling the equipment (contact a grounded
surface and maintain contact while handling the equipment, a grounded wrist strap
can/should also be utilized).
• Do not touch any components on the printed circuit board with your hands or any
other conductive equipment.
• Do not place the equipment on or near materials such as Styrofoam, plastic and
vinyl. Place the equipment on grounded surfaces and only use an anti-static bag for
transporting the equipment.
2. INSTALLATION
2.1. GENERAL INFORMATION
NOTE:
Installations should be done according to all
applicable electrical regulation codes as
required.
The following installation guidelines are provided for general information only pertaining
to typical site installations. For specific site installation information, consult Thomson
Technology as required. Note: Factory installations of THOMSON TECHNOLOGY
supplied control panels that have been tested and proven may deviate from these
recommendations.
CAUTION!!!
All installation and/or service work performed must be done by qualified
personnel only. Failure to do so may cause personal injury or death.
2.2. BATTERY SUPPLY INPUT
The MEC 2 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
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
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ground. The MEC 2 is internally protected by a solid state type fuse that protects it from
internal short circuits. The solid state fuse will automatically reset when the over current
condition is removed. Wiring from the engine cranking battery to the control panel should
conform to the following guidelines to avoid possible controller malfunction and/or
damage.
2.2.1. Avoid wiring from the engine starter terminals - wiring should go directly
from the battery terminals to the engine control panel (to avoid voltage drop in
the starter cables and starter motor commutator noise). Note: Unit mounted
control panels with short wiring runs may utilize connections from the starter
terminals provided that the specific application is tested satisfactorily.
CAUTION!!!
The battery charger must be turned off before battery cables are
removed from the battery (i.e. for servicing). Failure to do so may
subject the control panel to an over voltage condition in which
damage may result.
2.2.2. Wiring from battery to engine control panel should be two - #14 AWG
(2.5mm2) wires (i.e. do not use the engine block as one of the common
conductors).
2.2.3. Under noisy environments (i.e. gas engines with high voltage ignitions,
etc.), wiring from battery should be a twisted pair of #14 AWG (2.5mm2) wires.
2.3. SPEED SENSING INPUT
Field wiring of the speed sensing signal wires should conform to the following guidelines
to avoid possible controller malfunction and/or damage:
2.3.1. Wiring from magnetic pickup must utilize a 2 conductor shielded/twisted
cable. The drain (shield) wire must be connected at the control panel end only.
2.3.2. Magnetic pickup voltage at cranking speed must be greater than 3.0VAC.
At nominal speed, magnetic pickup voltage should be between 3 and 5VAC.
2.3.3. A single dedicated magnetic pickup is recommended for connection to the
speed sensing input terminals. Note: One common magnetic pickup may be
utilized for the system provided specific test measurements are done with the
equipment installed (i.e. mag pickup voltage levels meet the required levels).
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
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2.4. DC VOLTAGE INPUTS
All DC voltage inputs to the MEC 2 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
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 2 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.
For 3 phase 3 wire systems (i.e. no neutral) or high voltage systems, potential
transformers must be used. Refer to FIGURES #1 - 4 for voltage sensing connections.
To display generator line to neutral voltage in a 3 phase 4 wire system, the neutral must
be connected as shown.
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
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GRD
MEC 2
FIGURE #1
3Ø, 4W 208/380/480/600VAC DIRECT SENSING
SOLIDLY GROUNDED NEUTRAL SYSTEM
VOLTAGE INPUTS
600VAC L-L, 347VAC L-N
380VAC L-L, 220VAC L-N
480VAC L-L, 277VAC L-N
208VAC L-L, 120VAC L-N
VA
VB
VC
VN
GRD
BACN
GEN.
GRD
ABC
N
GRD
MEC 2
FIGURE #2
1Ø, 3W 120/240VAC DIRECT SENSING
SOLIDLY GROUNDED NEUTRAL SYSTEM
VOLTAGE INPUTS
240VAC L-L, 120VAC L-N
Note:
L1 and L2 phase
voltages must be 120Vac
when referenced to common
neutral. (Delta connected
generators required PTs as per
figure#3 & no phase C PT)
VA
VB
VC
VN
GRD
L2L1 N
GEN.
GRD
L1 L2
N
No Connection
GRD
MEC 2
FIGURE #3
3Ø, 4W WYE PT's
SECONDARY PT VOLTAGE
208VAC L-L, 120VAC L-N
120VAC L-L, 69VAC L-N
VA
VB
VC
VN
GRD
BACN
GEN.
N
120
120
120
GRD
ABC
GRD
MEC 2
FIGURE #4
3Ø, 3W DELTA PT's
SECONDARY PT VOLTAGE
120VAC L-L
(NO NEUTRAL)
VA
VB
VC
VN
GRD
120
120
GRD
BAC
GEN.
ABC
N
No Connection
G:\ENGINEER\PRODUCTS\MEC2\MEC2_08.VSD REV. 1 02/01/23
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
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2.6. AC CURRENT INPUT
Current transformers (CT’s) must be used to supply the MEC 2 current inputs. CT
polarity is not critical for correct circuit operation. Note: The CT secondary common
conductors must be externally grounded for correct operation. CT’s must be rated for a
minimum of 1.5VA output at the specified accuracy.
CAUTION!!!
When installing or performing any service work on CT circuits, always de-
energize the system before proceeding with any work. Never open circuit
an energized CT as extreme high voltages may result which may cause
serious injury or death.
2.7. OUTPUTS
All outputs from the MEC 2 are relay driven contacts. Relay contacts have a
10A/240VAC resistive (3 Amp inductive 0.4pf), 8A/24Vdc rating and are isolated Form A
& Form C types. Interposing relays are recommended between the MEC 2 outputs and
end devices to prevent internal damage due to possible excessive current draw and/or
damage should an external fault occur. Note: These outputs will require external over
current 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. Transient suppression devices are recommended for all inductive devices
sharing wiring or if physically located near engine/generator control panels. For DC
operated relays or solenoids, use a suitably rated counter EMF Diode (or commonly
known as “freewheeling” diode). For AC operated relays or solenoids, use a suitably
rated metal oxide varistor (MOV) or capacitor/resistor suppressor.
2.8. EXTERNAL PANEL CONTROL WIRING
As a minimum, all control wiring shall conform to the local regulatory authority on
electrical installations. Specific wire sizes for typical circuits(of distances up to 100ft
(30m)) are as follows:
2.8.1. Battery Control Power #14 AWG (2.5mm2)
2.8.2. Engine Alarm/Shutdown Contacts #16 AWG (1.5mm2)
2.8.3. Remote Start Contact for Transfer Switch #14 AWG (2.5mm2)
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
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2.8.4. Crank & Preheat Output Wiring #14 AWG (2.5mm2) (To pilot
relays)
2.8.5. Speed Sensing Wiring #16 AWG (1.5mm2) 2
Conductor Shielded Cable
2.8.6. Metering Voltage Inputs #16 AWG (1.5mm2)
2.8.7. Metering Current Inputs (from CT’s) #14 AWG (2.5mm2)
For distances exceeding 100 Ft. (30m) consult Thomson Technology.
For unit mounted control panels, wire sizes may be reduced to the next smallest
wire size available.
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 (2.5mm2) should be run in a
separate conduit.
2.9.2. Avoid wiring near AC power cables to prevent pick-up of induced
voltages.
2.9.3. An interposing relay may be required if field wiring distance is excessively
long (i.e. greater than 100 feet (30m) and/or if a remote contact has a resistance
of greater than 5.0 ohms.
2.9.4. The remote start contact must be voltage free (i.e. dry contact). The use
of a “powered” contact will damage the engine controller.
2.10. MEC MOUNTING LOCATION/INSTALLATION
The MEC 2 Engine-generator controller is designed for mounting directly onto a control
panel door. Considerations should be given for the following:
• The controller should be installed in a dirt free, dry location away from
extreme heat sources.
• The LCD window should be installed at an optimum height for operator
viewing.
• Adequate space should be provided around the rear of the MEC 2 circuit
board for control wiring.
• 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.
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
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The MEC 2 controller can be installed onto a door of a control panel using one of the
following methods:
• The first method requires a special door cutout for the LCD display and LED’s
as shown in FIGURE #6. This mounting method requires the lexan faceplate
to be mounted directly onto the door of the control panel. The controller must
be disassembled to mount on the door, then re-assembled. Refer to FIGURE
#7 for correct assembly location of all parts.
• The second method of controller mounting requires a factory supplied
adapter faceplate as shown in FIGURE #8. This method only requires a
single large rectangular hole to be cut out of the door as shown in FIGURE
#9.
2.11. FACEPLATE MOUNTING DIMENSIONS
268 mm.
126 mm.126 mm.
166 mm.
49 mm.49 mm.
24 mm.24 mm.
75 mm.75 mm.
OUTLINE OF PRINTED CIRCUIT
BOARD UNDER PANEL DOOR
4 HOLES
4 mm. DIAMETER
(3/16" DRILL)
33 mm.
41 mm.
7 mm.
16.5 mm.
20 mm. 32 mm.
80 mm.
8 mm.8 mm.
TOP
CUTOUT
9 HOLES
6 mm. DIAMETER
(1/4" DRILL)
C
C
G:\ENGINEER\PRODUCTS\MEC20_07.VSD
FIGURE #6
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
11
2.12. MEC 2 ASSEMBLY - SIDE VIEW
MEC 2 ASSEMBLY – SIDE VIEW
PANEL DOOR
MEC 2 PCB
MEC 2 REAR COVER
#8-32 × 3/8" MACHINE SCREW
# 8-32 INTERNAL TOOTH LOCK WASHER
1.25" ALLUMINUM STANDOFF (HEX)
#8-32 THREAD
#8-32 INTERNAL TOOTH LOCK WASHER
1/2" NYLON SPACER
(#8-32 CLEARANCE
UNTHREADED)
PEM STUD
#8-32 × 1"
G:\ENGINEER\PRODUCTS\MEC2\MEC2_09.VSD Rev. 0 00/12/11
REARFRONT
HIGH VOLTAGE
MYLAR BARRIER
(mounts on bottom
right hand corner, as
viewed from rear)
FIGURE #7
Notes:
1. Ensure that all lockwashers are installed as shown above.
2. The high voltage mylar barrier (P/N TMW;10805;1) must be installed as shown
when the MEC 2 is installed onto the door of a control panel.
3. When the MEC 2 is installed on a door without 1” PEM studs, 1” machine screws
must be used.
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
12
11.5 in
7.5 in
TOP
C
C
CUTOUT
9 HOLES
1/4" DIAMETER
4 STUDS #8/32
1/4"
1/4"
FIGURE #8: ADAPTER FACEPLATE
G:\ENGINEER\PRODUCTS\MEC20_11.VSD Rev. 1 00/07/13
5.5 in
3.5 in
C
C
FIGURE #9: DOOR CUTOUT FOR ADAPTER FACEPLATE
10.875 in
6.875 in
2.13. DIELECTRIC TESTING
Do not perform any high voltage dielectric testing on the control panel with the MEC 2
connected in the circuit as serious damage will occur to the controller. All AC control
fuses connected to the MEC 2 must be removed if high voltage dielectric testing is
performed on the control panel.
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3. DESCRIPTION
The MEC 2 controller consists of three parts; a Lexan faceplate which is mounted externally on
the enclosure door, a printed circuit board (PCB) which is mounted inside the enclosure door,
and a rear cover for the PCB.
3.1. LEXAN FACEPLATE
The Lexan faceplate is shown as in FIGURE #10. The Lexan pushbuttons are 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.
MEC2_03.VSD Rev. 0 00/12/11
DECREMENT INCREMENT
SILENCE RESET
SHUTDOWN
ALARM READY
SPEED SIGNAL
EMERGENCY
STOP
RUN OFF AUTO LOAD
TEST
EXIT ENTER
14
3
2
13 1
6
7
4
11
12
5
8
9
10
LAMP TEST
MICROPROCESSOR ENGINE CONTROLLER
MEC 2
FIGURE #10
LCD viewing window. The LCD display is mounted on the main PCB that
is visible through the lexan faceplate viewing window.
EXIT pushbutton. The EXIT function is used to scroll backwards through
the status menus or programming prompts to the previous item. The EXIT
function is used to “exit” the programming menu by holding this button down for
approximately 2 seconds while in the programming mode.
DECREMENT pushbutton. The DECREMENT function is used to change
a programming value while in the programming mode. When this pushbutton is
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
14
held down, the displayed value will be “decremented” to a lower value as desired.
Note: The longer the pushbutton is held down, the faster the value will be
decremented.
INCREMENT pushbutton. The INCREMENT function is used to change a
programming value while in the programming mode or to select a desired
programming menu loop. When this pushbutton is held down, the displayed
value will be “incremented” to a higher value as desired. Note: The longer the
pushbutton is held down, the faster the value will be incremented.
ENTER pushbutton. 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” a programming mode as well as accepting changed
programming values. Note: In the programming mode, the longer the ENTER
pushbutton is held down, the faster the next menu prompts will appear.
RUN pushbutton and LED light viewing window. The RUN function is
used to initiate a manual start signal to the engine-generator set. Refer to the
operating instructions for detailed information.
OFF pushbutton and LED light viewing window. The OFF function is
used to initiate a stop signal to the engine-generator set. Refer to the operating
instructions for detailed information.
AUTO pushbutton and LED light viewing window. The AUTO function is
used to initiate automatic operation of the engine-generator set. Refer to the
operating instructions for detailed information.
LOAD TEST pushbutton and LED light viewing window. The LOAD TEST
function is used to initiate load test of the engine-generator set when connected
to an associated transfer switch. Refer to the operating instructions for detailed
information.
VEMERGENCY STOP pushbutton and LED light viewing window. The
EMERGENCY STOP function is used to initiate an emergency stop signal to the
engine-generator set. Refer to the operating instructions for detailed information.
11
READY LED light viewing window. The READY LED illuminates when the
engine-generator set is set for automatic operation and no shutdown or alarm
faults have been activated.
12
SPEED SIGNAL LED light viewing window. The SPEED SIGNAL LED
illuminates when the engines speed signal is detected (i.e. the engine is turning
over).
13
ALARM LED light viewing window. The ALARM LED illuminates (flashes)
MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
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15
when any pre-programmed alarm fault has been activated.
14
SHUTDOWN LED light viewing window. The SHUTDOWN LED
illuminates (flashes) when any pre-programmed shutdown fault has been
activated.
3.2. PRINTED CIRCUIT BOARD
The printed circuit board (PCB) is shown in FIGURE #11. The PCB contains the
following user interface items:
MEC 2 CIRCUIT BOARD LAYOUT
17MP1 MP2 1
TB2
TB1
IN
IC
IB
IA
VN
VC
VB
VA
WATCHDOG
REMOTE START
CRANK
RUN
COM FAIL
TB3 18 38
TB4
G:\ENGINEER\PRODUCTS\MEC2MEC2_02.VSD Rev.2 02/01/23
DRAWING SCALE (mm) = .6:1
B+ B- GRD
R115
CONTRAST
J6
Expansion
Port
FIGURE #11
This manual suits for next models
1
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