Generac Mobile MGG450, Руководство пользователя

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32 Owner’s Manual for MGG450
Troubleshooting
Digital Controller Troubleshooting Guide
Problem Cause Solution
LCD Display Cannot Be
Viewed
Improper supply voltage.
Check DC supply voltage at termi-
nals B+ & B- (10-30 VDC).
Improper contrast adjustment. Adjust LCD contrast for best display.
Controller Cannot Be “Reset"
Engine not stopped.
Verify the engine is at a complete
stop before trying to reset.
Controller not OFF.
Turn controller OFF before reset-
ting.
No “RUN" Output Signal
“Shutdown Faults" not reset.
All shutdown faults must be reset
(red shutdown LED must be OFF).
Engine speed not detected at cranking.
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 pickup signal at
cranking (2.0 VAC minimum during
cranking).
Overspeed Shutdown Occurs
at Normal Speed
Controller programmed values are wrong
or controller has failed.
Verify the controller programmed
values are correct for the number of
flywheel teeth, nominal RPM, and
overspeed set point percentage.
Replace controller if failed.
Wiring incorrect. Check wiring.
Voltage or Current Metering is
Incorrect
Controller programmed values are wrong.
Verify the controller programmed
values are correct for the voltage
sensing PT ratio and/or current
sensing CT ratio.
Ground is missing.
Verify that the battery supply DC
negative conductor is properly
grounded to the engine block (i.e. to
a common ground point).
Voltage sensing wiring mistake.
Verify the voltage sensing wiring
connection to the controller
matches power distribution type.
Engine Temperature or Oil
Pressure Display is Incorrect Failed engine sensor.
Ground is missing.
Verify engine sensors.
Verify that the battery supply DC
negative conductor is properly
grounded to the engine block (i.e. to
a common ground point).
Engine Alarms Are on For
High Engine Temperature or
Low Oil Pressure when
Engine is Operating Properly
Wrong temperature
Verify engine mounted senders
have correct resistance values for
corresponding input temperature or
pressure.
Wrong pressure calibration. Verify calibration.
Keypad Buttons (Switches)
Do Not Operate
Keypad not connected to controller.
Verify the interconnecting ribbon
cable between the lexan faceplate
and main printed circuit board is cor-
rectly connected. Replace control-
ler if failed.