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7.2 ANALYSIS OF TRACTION RELATED ALARMS DISPLAYED ON CONSOLE
1. WATCH DOG
It is a self-diagnosing test within the logic between Master and Slave µcontrollers. This
alarm could also be caused by a canbus malfunctioning, which blinds Master-Slave
communication. So, before replacing the controller, check the canbus.
2. LOGIC FAILURE #3
Fault in the hardware section of the logic board which manages the hardware current
protection. Replace the logic board.
3. LOGIC FAILURE #2
Fault in the hardware section of the logic board which manages the phase' s voltage
feedback. Replace the logic board.
4. LOGIC FAILURE #1
This alarm signals that the undervoltage / overvoltage protection interrupt has been
triggered. Two possible reasons:
a. A real undervoltage / overvoltage situation happened.
b. Fault in the hardware section of the logic board which manages the overvoltage
protection. Replace the logic card.
5. VMN LOW, VMN HIGH
The test is carried out during initial diagnosis and in standby.
Possible causes:
a. problem with the motor connections or the motor power circuit; check if the 3 phases
are correctly connected; check if there's a dispersion of the motor to truck frame.
b. fault in the inverter power section, replace the controller.
6. STBY I HIGH
The µCs verify if the feedback of current sensors device output is within the zero current
window. Possible causes of the alarm:
a. current sensor failure;
b. failure in the logic card: first replace the logic card; if the defect persists, replace the
power unit.
7. CAPACITOR CHARGE
Follows the charging capacitor system:
When the key is switched ON, the inverter tries to charge the capacitor through a power
resistance, and check if the capacitor are charged within a timeout. If they do not
charge, an alarm is signalled; the main contactor is not closed.
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