31
VMN HIGH
(Alarm)
Stored
Cause 1: Before switching the main contactor on, the software checks the power bridge; it turns on alternatingly the low side and high side power mosfets and expects the phases to be lower than 1/2 V batt. If it is higher than this value, this alarm occurs. Cause 2: This alarm may occur also when the startup diagnosis is overcome and the main contactor is closed. In this condition, the phases voltages are expected to be lower than 1/2 V batt. If it is higher than this value, this alarm occurs. a) If the alarm happens during start up (the main contactor does not close at all), check following: - motor internal connections (ohmic continuity) - motor power connections - motor leakage to truck frame - if the motor connections are OK, the fault is in the Combiac1 controller. b) If the alarm occurs after closing the main contactor (the main contactor closes and then opens again), check following: - motor connections - if motor phases windings/cables have leakages towards truck frame - that the main contactor closes properly, with a good contact - if no faults are found, the fault is in the Combiac1 controller. 37
CONTACTOR CLOSED
(Alarm)
Stored
Cause: Before driving the main contactor coil, the controller checks that contactor not is stuck (closed). The controller drives the mosfets for some milliseconds, trying to discharge the capacitor bank. If they don’t discharge, this alarm occurs. Check following: - main contactor tips - if needed replace the main contactor
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