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Fault
The engine runs, but the controller shows
genset to be OFF.
The controller shows incorrect PF value or
kW or load current.
The controller shows incorrect mains
voltage or incorrect main alternator
voltage.
The controller shows incorrect reading for
any of LOP, fuel level or temperature
sensors.
Auto mode troubleshooting
Fault
The controller does not start the engine
when a Remote start command is sent
from an external device.
Controller does not stop engine even
when a Remote stop command is sent
from an external device.
While in Auto mode, the controller sends a
Start command even if the Mains is
present.
SGC 121 only troubleshooting
Fault
The governor actuator chatters even after
the engine stops.
The controller shows genset ON while
genset is at rest.
Fail to stop alarm when genset is at rest.
The controller does not maintain the target
RPM.
The engine RPM is not stable or engine
hunts.
The controller cranks the engine but does
not start the engine.
USER MANUAL 4189341226A UK
Action
•
Check if the MPU signal (if used), and main alternator voltage signal (L1 phase)
are received by the controller terminals.
•
Check if the LOP and LLOP are working OK. Check the wiring to the controller.
•
Check wiring of the respective alternator phase voltage and the CT to the
controller.
•
Check the CT ratio (if kW or current reading is faulty).
•
Check the wiring of the respective phase to the controller.
•
If the problem is not resolved, replace the controller and try again.
•
Check the respective sensor and its wiring.
•
Enter the Configuration mode in the controller and verify the calibration for the
respective sensor in the configuration.
Action
•
Check the wiring of the Remote start signal to the controller's respective digital
input terminal.
•
Enter the Configuration mode in the controller and verify the configuration for the
Remote start digital input terminal.
•
Check that the controller is in Auto mode.
•
Check for Mains monitoring disabled and Site mode disabled.
•
Check the wiring of the Remote stop signal to the controller's respective digital
input terminal.
•
Enter the Configuration mode in the controller and verify the configuration for the
Remote stop digital input terminal.
•
Check that the controller is in Auto mode.
•
Check the wiring of the mains L1, L2 and L3 phase to the controller's respective
input terminal.
•
Enter the Configuration mode in the controller and verify the configuration for the
Mains monitoring.
Action
•
Enter Configuration mode in the controller and verify the configuration for the LLOP
and LOP. Also check the wiring.
•
Ensure that Mains voltage wiring is not connected by mistake to the controller's
genset voltage terminals.
•
Check that the mechanical linkage assembly is OK.
•
Enter Configuration mode in the controller and verify the configuration for
GOVERNOR.
•
Check the PID control gains.
•
Check that the actuator moves to full throttle position when the engine is cranked.
Page 72 of 72
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