CodeCode
Programmer displayProgrammer display
Probable fault reasonProbable fault reason
Deep faultDeep fault
reason/troubleshootingreason/troubleshooting
Fault displayFault display
1818
Severe OvervoltageSevere Overvoltage
Overhigh voltageOverhigh voltage
Motor stops workingMotor stops working
Main contactor disconnectsMain contactor disconnects
Electromagnetic brake disconnectsElectromagnetic brake disconnects
Throttle invalidThrottle invalid
BrakeBrake
Pump stops workingPump stops working
1. Setup error 1. Setup error of battery parameter.of battery parameter.
2. High battery impedance.2. High battery impedance.
3. Battery disconnects when3. Battery disconnects when
regenerative breaking.regenerative breaking.
ReasonReason
：：
When MOSFEET axleWhen MOSFEET axle
working, capacitor voltageworking, capacitor voltage
exceeds the minimum voltageexceeds the minimum voltage
limit.limit.
TroubleshootingTroubleshooting ：： Reduce theReduce the
voltage and then restart the keyvoltage and then restart the key
switch.switch.
2121
Controller Undertemp CutbackController Undertemp Cutback
No fault(unless VCL set theNo fault(unless VCL set the
incurred fault)incurred fault)
1.Controller works in limited1.Controller works in limited
condition.condition.
2. Severe controller working2. Severe controller working
environment.environment.
ReasonReason：：Radiator temperature isRadiator temperature is
lower than-25lower than-25℃℃..
TroubleshootingTroubleshooting
：：
Make theMake the
radiator temperature higher thanradiator temperature higher than
-25-25℃℃..
2222
Controller Overtemp CutbackController Overtemp Cutback
Drive or regenerative brakingDrive or regenerative braking
torque reduces.torque reduces.
1. Severe controller working1. Severe controller working
environment.environment.
2. Truck overloads.2. Truck overloads.
3. Incorrect controller mounting3. Incorrect controller mounting
ReasonReason：： Radiator temperature Radiator temperature
exceeds 85exceeds 85℃℃..
TroubleshootingTroubleshooting
：：
Reduce theReduce the
temperature.temperature.
2323
Undervoltage CutbackUndervoltage Cutback
Driving torque reducesDriving torque reduces
1. Insufficient battery 1. Insufficient battery power.power.
2. Setup error 2. Setup error of battery parameter.of battery parameter.
3. Power consumption of non3. Power consumption of non
controller system.controller system.
4. Too large battery impedance.4. Too large battery impedance.
5. Battery 5. Battery disconnects.disconnects.
6. Fuse protector disconnects or6. Fuse protector disconnects or
main contactor disconnects.main contactor disconnects.
ReasonReason ：： Too low capacitor Too low capacitor
voltage.voltage.
TroubleshootingTroubleshooting
：：
Raise capacitorRaise capacitor
voltage.voltage.
2424
Overvoltage CutbackOvervoltage Cutback
Regenerative braking torqueRegenerative braking torque
reduces.reduces.
1. During regenerative braking,1. During regenerative braking,
regenerative braking current causeregenerative braking current cause
the raising of battery voltage.the raising of battery voltage.
2. Setup error 2. Setup error of battery parameter.of battery parameter.
3. Too large battery impedance.3. Too large battery impedance.
4. When regenerating braking,4. When regenerating braking,
battery disconnects.battery disconnects.
ReasonReason：：When MOSFEET axleWhen MOSFEET axle
working, capacitor voltageworking, capacitor voltage
exceeds the maximum voltageexceeds the maximum voltage
limit.limit.
TroubleshootingTroubleshooting
：：
Reduce Reduce
capacitor voltage.capacitor voltage.
2525
+5V Supply Failure+5V Supply Failure
No fault(unless VCL set theNo fault(unless VCL set the
incurred fault)incurred fault)
1. External load impedance is too1. External load impedance is too
low.low.
ReasonReason：： 5V supply outside the 5V supply outside the
5V±10% range5V±10% range
TroubleshootingTroubleshooting
：：
Bring voltageBring voltage
within range.within range.
2626
Digital Out 6 FailureDigital Out 6 Failure
Digital Out 6 driver is not Digital Out 6 driver is not active.active.
1. External load impedance is too1. External load impedance is too
low.low.
ReasonReason：： Digital Output 6 currentDigital Output 6 current
exceeds15mA.exceeds15mA.
TroubleshootingTroubleshooting
：：
Adjust load, setAdjust load, set
“set_digout()” by VCL, and“set_digout()” by VCL, and
restart.restart.
2727
Digital Out 7 OvercurrentDigital Out 7 Overcurrent
The Digital Out 7 driver is notThe Digital Out 7 driver is not
activeactive
1. External load impedance is too1. External load impedance is too
low.low.
ReasonReason：：Digital Output 7 currentDigital Output 7 current
exceeds15mA.exceeds15mA.
TroubleshootingTroubleshooting
：：
Adjust load, setAdjust load, set
“set_digout()” by VCL, and“set_digout()” by VCL, and
restart.restart.
2828
Motor Temp Hot CutbackMotor Temp Hot Cutback
Driving torque reduced.Driving torque reduced.
1.1. MMotor temperature reaches orotor temperature reaches or
exceeds parameterexceeds parameterlimit, thuslimit, thus
cause current output reduce.cause current output reduce.
2.2. Motor temperature parametersMotor temperature parameters
incorrect.incorrect.
3. If motor does not apply3. If motor does not apply
temperature sensor, programmingtemperature sensor, programming
parameter “Temp compensation”parameter “Temp compensation”
and “Temp cutback” must setand “Temp cutback” must set
“OFF”.“OFF”.
ReasonReason：：Input voltage value ofInput voltage value of
motor temperature sensor is 0 ormotor temperature sensor is 0 or
larger than larger than 10V10V..
TroubleshootingTroubleshooting
：：
Return theReturn the
motor temperature to be withinmotor temperature to be within
the permitted limits.the permitted limits.
2929
Motor Temp Sensor FaultMotor Temp Sensor Fault
Max. speed drops to LOS statusMax. speed drops to LOS status
and motor temperature cutbackand motor temperature cutback
invalid.invalid.
1. Motor temperature sensor is1. Motor temperature sensor is
connected wrongly.connected wrongly.
2. If motor does not apply2. If motor does not apply
temperature sensor, programmingtemperature sensor, programming
parameter “Temp compensation”parameter “Temp compensation”
ReasonReason：：Input voltage value ofInput voltage value of
motor temperature sensor is 0 ormotor temperature sensor is 0 or
larger than larger than 10V10V..
Troubleshooting: Adjust inputTroubleshooting: Adjust input
voltage value of motorvoltage value of motor
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