Zapi ACEX, User Manual

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AFCZP0BC – COMBIACX & ACEX - User Manual Page - 65/81
- If no problem are found on the motors, the problem is inside the
controller.
3) “VMN HIGH”
Cause 1:
Before switching the LC on, the software checks the power bridge: it turns on
alternating the Low side Power Mosfets and expects the phases voltage to
decrease down to -Batt. If the phases voltage do not decrease, this alarm
occurs.
Cause 2:
This alarm may occur also when the start up diagnosis is overcome, and so the
LC is closed. In this condition, the phases’ voltages are expected to be lower
than 1/2 Vbatt. If it is higher than that value, fault status is entered.
Troubleshooting:
A) If the problem occurs at start up (the LC does not close at all), check:
- Motor internal connections (ohmic continuity)
- Motor power cables connections
- If the motor connection are OK, the problem is inside the controller
B) If the problem occurs after closing the LC (the LC closed and then opens
back again), check:
- Motor connections
- If motor phases windings/cables have leakages towards truck frame
- If no problem are found on the motors, the problem is inside the
controller
4) “POWER MOS SHORT”
Cause: Before switching the LC on, the software checks the power bridge: it
turns on alternating the Low side and High side Power Mosfets and expects the
phases voltage to decrease down to –BATT (increase up to +Batt). If the phases
voltage do not follow the comands, this alarm occurs.
Troubleshooting:
This type of fault is not related to external components; replace the controller.
5) “COIL SHOR MC-EB”
Cause:
This alarm occurs when there is a short circuit of one of the coils connected to
outputs of the COMBIACX / ACEX (LC coil or EB coil). After the overload
condition has been removed, the alarm exits automatically by releasing and
then enabling a travel demand.
Troubleshooting:
A) The typical root cause for this error code to be displayed is in the harness or
in the load coil. So the very first check to carry out concerns connections
between controller outputs and loads.
B) In case no failures/problems have been found externally, the problem is in
the controller, which has to be replaced.
6) “DRIVER SHORTED”
Cause:
The driver of the main contactor coil is shorted or the coil is disconnected.
Troubleshooting:
A) Check if there is a short or a low impedance pull-down between NLC
CNB#6 and –BATT.
B) The driver circuit is damaged in the controller, which has to be replaced.
C) The wires to the LC coil are interrupted or not connected, so check the coil
related harness.