MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
83
SYMPTOM CORRECTIVE ACTION
No “RUN” output signal - Check that all shutdown circuits are reset
(red shutdown LED must be off).
- Engine speed signal must be detected
(speed signal green LED on) during
cranking if the “run-output fail safe” feature
is enabled. 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.
Over speed shutdown occurs at normal speed - Verify that the controller has been
programmed with the correct values for the
number of flywheel teeth, nominal RPM,
and over speed setpoint percentage.
Voltage or current metering is reading incorrectly - Verify that the controller has been
programmed with the correct values for the
voltage sensing PT ratio and/or current
sensing CT ratio.
- Verify that the battery supply DC negative
conductor is properly grounded to the
engine block (i.e. to a common ground
point).
- Verify that the controller’s analog input has
been properly calibrated as per manual
instructions.
- Verify the voltage sensing wiring connection
to the MEC 2 matches power distribution
type. (Note: standard direct voltage
connection requires that the generators
neutral is solidly grounded.)
Engine temperature or oil pressure display is
reading incorrectly
- Verify that the controller’s analog input has
been properly calibrated as per manual
instructions.
- Verify engine sensor wiring is correct.
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