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Ⅺ. Common faults and trouble shooting
1234 programmer fault menu and LED status display format
There are two LED lights (Red and Yellow) on the case of controller. The two LEDs have four
different display modes, indicating the type of information they are providing.
DISPLAY STATUS
Neither LED illuminated Controller is not powered on, has a dead battery, or is
severely damaged.
Yellow LED flashing Controller is operating normally.
Yellow and red LEDs both on
solid.
Controller is in Flash program mode.
Yellow and red LEDs flashing
alternatively.
Controller has detected a fault.
Code
Fault Display Possible cause
1，2
Controller Overcurrent
(Shutdown MainContactor;
Shutdown Motor;
Shutdown EMBrake.)
1. External short of phase U,V, or W motor connections.
2. Motor parameters are mis-tuned.
3. Controller defective.
1，3
Current Sensor Fault
(Shutdown MainContactor;
Shutdown Motor;
Shutdown EMBrake.)
1. Leakage to vehicle frame from phase
U, V, or W (short in motor stator).
2. Controller defective.
1，4
Precharge Failed
(Shutdown MainContactor;
Shutdown Motor;
Shutdown EMBrake. ）
1. External load on capacitor bank (B+ connection terminal) that
prevents the capacitor bank from charging.
2. See 1311 menu Monitor. Battery:
Capacitor Voltage.
1，5
Controller Severe Undertemp
(Shutdown MainContactor;
Shutdown Motor;
Shutdown EMBrake;
Shutdown Throttle;
Full brake)
1. Controller is operating in an extreme environment (below -40°C.)
2. See 1311 menu Monitor. Controller Temperature.
1，6
Controller Severe Overtemp
(Shutdown MainContactor;
Shutdown Motor;
Shutdown EMBrake;
Shutdown Throttle;
FullBrake.)
1. Controller is operating in an extreme environment.(over 95℃)
2. Excessive load on vehicle.
3. Improper mounting of controller.
4. See 1311 menu Monitor. Controller:
Temperature.
1，7
Severe Undervoltage
(Reduced drive torque.)
1. Battery Menu parameters are misadjusted.
2. Non-controller system drain on battery.
3. Battery resistance too high.
4. Battery disconnected while driving.
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