Maintenance

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

38 CONTACTOR OPEN (Alarm) Stored

Cause: The main contactor has been driven by the controller, but the contactor does not close, check following:

a) the wires to the main contactor coil are interrupted or not connected.

b) it can also be a fault in the main contactor itself, if needed replace the contactor.

53 STBY I HIGH (Alarm) Stored

Cause: The current transducer or the current feed back circuit is damaged in the controller.

This type of fault is not related to external components; so, when it is present it is necessary to replace the Combiac1 controller.

60 CAPACITOR CHARGE (Alarm) Stored

Cause: In working condition, a resistance connected between the key and the rail capacitors, keeps the capacitors charged before the main contactor closes. When the voltage on the rail capacitors, measured on the motor phases are low and does not increase when the main contactor is opened, this alarm occurs.

There are three possibilities: - another device, connected in parallel with the rail capacitors, has a failure. - At least one motor phase is not connected to the controller or it is broken. - a power failure or a logic failure occurred in the controller. In this case it is necessary to replace the Combiac1 controller.

62 TH. PROTECTION (Warning) Stored

Cause: This alarm indicates that the controller temperature is over 85°C. the maximum current is reduced proportionally to the temperature increase. The controller stops when 105°C is reached. If this alarm is signalled when the controller is cold: