Page – 90/139 AFFZP0BB – ACE3 – User Manual
9.1.1 Troubleshooting of master-uC alarms
1) VDC LINK OVERV.
Cause
This fault is displayed when the controller detects an overvoltage condition.
Overvoltage threshold is 65 V for 36/48V controllers and 116 V for 80V
controllers.
As soon as the fault occurs, power bridge and MC are opened. The condition is
triggered using the same HW interrupt used for undervoltage detection, uC
discerns between the two evaluating the voltage present across DC-link
capacitors:
- High voltage Overvoltage condition
- Low/normal voltage Undervoltage condition
Troubleshooting
If the alarm happens during the brake release, check the line contactor contact
and the battery power-cable connection.
2) LOGIC FAILURE #1
Cause
This fault is displayed when the controller detects an undervoltage condition at
the key input (A1).
Undervoltage threshold is 11V for 36/48V controllers and 30 V for 80V
controllers.
Troubleshooting (fault at startup or in standby)
- Fault can be caused by a key input signal characterized by pulses below
the undervoltage threshold, possibly due to external loads like DC/DC
converters starting-up, relays or contactors during switching periods,
solenoids energizing or de-energizing. Consider to remove such loads.
- If no voltage transient is detected on the supply line and the alarm is
present every time the key switches on, the failure probably lies in the
controller hardware. Replace the logic board.
Troubleshooting (fault displayed during motor driving)
- If the alarm occurs during motor acceleration or when there is a
hydraulic-related request, check the battery charge, the battery health and
power-cable connections.
3) LOGIC FAILURE #2
Cause
Fault in the hardware section of the logic board which deals with voltage
feedbacks of motor phases.
Troubleshooting
The failure lies in the controller hardware. Replace the controller.
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