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7. Fault and solution
7-1. Fault alarm and solution
When the inverter is abnormal, the LED tube will display the function code and its content of the corresponding
fault, the fault relay will act, and the inverter will stop output. In case of fault, if the motor is rotating, it will
stop freely until it stops rotating. The possible fault types of frequency converter are shown in the table. When
the frequency converter fails, the user should first check according to the table, and record the failure
phenomenon in detail. If you need technical service, please contact our after-sales service and technical support
department or our agents.
1. There is grounding or short circuit in the
output circuit of frequency converter
2. The control mode is vector control
without parameter tuning
3. The acceleration time is too short
4. Improper manual torque lifting or VF
curve
5. The voltage is low
6. Start the rotating motor
7. Sudden loading during acceleration
8. The selection of frequency converter is
too small
1. Remove peripheral faults
2. Tuning of motor parameters
3. Increase acceleration time
4. Adjust the manual lifting torque or
VF curve
5. Adjust the voltage to the normal
range
6. Select speed tracking start or wait
until the motor stops
7. Cancel sudden loading
8. Choose the frequency converter with
higher power level
1. There is grounding or short circuit in the
output circuit of frequency converter
2. The control mode is vector control
without parameter tuning
3. The deceleration time is too short
4. The voltage is low
5. Sudden loading during deceleration
6. There is no additional brake unit and
brake resistor
1. Remove peripheral faults
2. Tuning of motor parameters
3. Increase deceleration time
4. Adjust the voltage to the normal
range
5. Cancel sudden loading
6. Add brake unit and resistor
Constant speed
over current
1. There is grounding or short circuit in the
output circuit of frequency converter
2. The control mode is vector control
without parameter tuning
3. The voltage is low
4. Is there sudden load in operation
5. The selection of frequency converter is
too small
1. Remove peripheral faults
2. Tuning of motor parameters
3. Adjust the voltage to the normal
range
4. Cancel sudden loading
5. Choose the frequency converter with
higher power level
1. High input voltage
2. There is external force to drive the motor
during acceleration
3. Acceleration time too short
4. There is no additional brake unit and
brake resistor
1. Adjust the voltage to the normal
range
2. Cancel additional force or add brake
resistor
3. Increase acceleration time
4. Add brake unit and resistor
1. High input voltage
2. There is external force to drive the motor
during deceleration
1. Adjust the voltage to the normal
range
2. Cancel additional force or add brake
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