Variable Frequency Drive User Manual
Chapter 7 Fault Diagnosis and Countermeasures
7.1 Fault Alarms and Countermeasures

7.1 Fault Alarms and Countermeasures

The frequency inverter has 32 warning messages and protection functions. Once a fault occurs, the protection function is activated, the frequency inverter stops outputting, the relay contact of the frequency inverter fault operates, and the fault code is displayed on the frequency inverter display panel. Before seeking service, users can perform self-checks according to the prompts in this section, analyze the causes of the fault, and find solutions. If service is required, please contact the dealer where you purchased the frequency inverter or contact our company directly.

Among the 21 warning messages, ERR22 indicates hardware overcurrent or overvoltage signal, and in most cases, hardware overvoltage faults cause ERR22 alarms.

Serial Number Fault Name Fault Code Fault Cause Analysis Troubleshooting Measures
1 Inverter unit protection ERR01 1. Short circuit in the output circuit of the inverter
2. Motor and inverter wiring is too long
3. Module overheating
4. Loose internal wiring of the inverter
5. Main control board abnormality
6. Drive board abnormality
7. Inverter module abnormality		 1. Exclude peripheral faults
2. Install reactors or output filters
3. Check if the air duct is blocked, if the fan is working normally, and exclude any issues
4. Plug in all connectors
5. Seek technical support
6. Seek technical support
7. Seek technical support
2 Acceleration overcurrent ERR02 1. Grounding or short circuit in the output circuit of the inverter
2. Vector control mode without parameter identification
3. Acceleration time is too short
4. Manual torque boost or V/F curve is inappropriate
5. Low voltage
6. Starting the motor that is already rotating
7. Sudden load during acceleration
8. Undersized selection of the inverter		 1. Exclude peripheral faults
2. Perform motor parameter identification
3. Increase acceleration time
4. Adjust manual torque boost V/F curve
5. Adjust voltage to normal range
6. Choose speed tracking start or start after the motor stops
7. Remove sudden load
8. Choose a larger power rating inverter
3 Deceleration overcurrent ERR03 1. Grounding or short circuit in the output circuit of the inverter
2. Vector control mode without parameter identification
3. Deceleration time is too short
4. Low voltage
5. Sudden load during deceleration
6. No brake unit and brake resistor installed		 1. Exclude peripheral faults
2. Perform motor parameter identification
3. Increase deceleration time
4. Adjust voltage to normal range
5. Remove sudden load
6. Install brake unit and resistor
4 Constant speed overcurrent ERR04 1. Grounding or short circuit in the output circuit of the inverter
2. Vector control mode without parameter identification
3. Low voltage
4. Sudden load during operation
5. Undersized selection of the inverter		 1. Exclude peripheral faults
2. Perform motor parameter identification
3. Adjust voltage to normal range
4. Remove sudden load
5. Choose a larger power rating inverter
5 Acceleration overvoltage ERR05 1. Input voltage is too high
2. External force dragging the motor during acceleration
3. Acceleration time is too short
4. No brake unit and brake resistor installed		 1. Adjust voltage to normal range
2. Remove external force or install brake resistor
3. Increase acceleration time
4. Install brake unit and resistor
6 Deceleration overvoltage ERR06 1. Input voltage is too high
2. External force dragging the motor during deceleration
3. Deceleration time is too short
4. No brake unit and brake resistor installed		 1. Adjust voltage to normal range
2. Remove external force or install brake resistor
3. Increase deceleration time
4. Install brake unit and resistor
7 Constant speed overvoltage ERR07 1. Input voltage is too high
2. External force dragging the motor during deceleration		 1. Adjust voltage to normal range
2. Remove external force or install brake resistor
8 Control power failure ERR08 1. Input voltage is not within the specified range 1. Adjust voltage to the specified range
9 Under voltage fault ERR09 1. Momentary power failure
2. Input voltage of the inverter is not within the specified range
3. Abnormal bus voltage
4. Rectifier bridge and buffer resistor are abnormal
5. Drive board abnormality
6. Control board abnormality		 1. Reset the fault
2. Adjust the voltage to the normal range
3. Seek technical support
4. Seek technical support
5. Seek technical support
6. Seek technical support
10 Inverter overload ERR10 1. Is the load too large or is the motor blocked
2. Undersized selection of the inverter		 1. Reduce the load and check the motor and mechanical conditions
2. Choose a larger power rating inverter
11 Motor overload ERR11 1. Is motor protection parameter P9-01 set properly
2. Is the load too large or is the motor blocked
3. Undersized selection of the inverter		 1. Correctly set this parameter
2. Reduce the load and check the motor and mechanical conditions
3. Choose a larger power rating inverter
12 Input phase loss ERR12 1. Abnormal three-phase input power supply
2. Drive board abnormality
3. Surge protection board abnormality
4. Main control board abnormality		 1. Check and eliminate problems in the peripheral circuit
2. Seek technical support
3. Seek technical support
4. Seek technical support
13 Output phase loss ERR13 1. Abnormal wiring from the inverter to the motor
2. Unbalanced three-phase output of the inverter during motor operation
3. Drive board abnormality
4. Module abnormality		 1. Check and eliminate problems in the peripheral circuit
2. Check if the motor three-phase winding is normal and eliminate faults
3. Seek technical support
4. Seek technical support
14 Module overheating ERR14 1. High ambient temperature
2. Air duct blockage
3. Fan damage
4. Damage to the module’s thermistor
5. Damage to the inverter module		 1. Reduce ambient temperature
2. Clean the fan
3. Replace the fan
4. Replace the thermistor
5. Replace the inverter module
15 External device fault ERR15 1. Input of external fault signal through multifunction terminal X
2. Input of external fault signal through virtual IO function		 1. Reset and run
2. Reset and run
16 Communication fault ERR16 1. Abnormal operation of the host computer
2. Abnormal communication line
3. Reserved
4. Incorrect setting of communication parameters PD group		 1. Check the host computer connection
2. Check the communication cable
3. Correctly set the communication expansion card type
4. Correctly set the communication parameters
17 Contactor fault ERR17 1. Abnormality in the drive board and power supply
2. Contactor abnormality		 1. Replace the drive board or power supply board
2. Replace the contactor
18 Current detection fault ERR18 1. Check for abnormal Hall devices
2. Drive board abnormality		 1. Replace the Hall device
2. Replace the drive board
19 Motor tuning fault ERR19 1. Motor parameters not set according to nameplate
2. Timeout during parameter identification process		 1. Correctly set motor parameters according to nameplate
2. Check the inverter-to-motor wiring
20 EEPROM read/write fault ERR21 1. EEPROM chip damage 1. Replace the main control board
21 Inverter hardware fault ERR22 1. Overvoltage exists
2. Overcurrent exists		 1. Handle according to overvoltage fault
2. Handle according to overcurrent fault
22 Ground short-circuit fault ERR23 1. Motor ground short circuit 1. Replace cables or motor
23 Cumulative running time reaches fault ERR26 1. Cumulative running time reaches set value 1. Use parameter initialization function to clear record information
24 User-defined fault 1 ERR27 1. Input of user-defined fault 1 signal through multifunction terminal X
2. Input of user-defined fault 1 signal through virtual IO function		 1. Reset and run
2. Reset and run
25 User-defined fault 2 ERR28 1. Input of user-defined fault 2 signal through multifunction terminal X
2. Input of user-defined fault 2 signal through virtual IO function		 1. Reset and run
2. Reset and run
26 Cumulative power-on time reaches fault ERR29 1. Cumulative power-on time reaches set value 1. Use parameter initialization function to clear record information
27 Unload fault ERR30 1. Inverter running current is less than P9-64 1. Confirm whether the load is disconnected or if the settings of parameters P9-64 and P9-65 are consistent with actual operating conditions
28 PID feedback loss during operation fault ERR31 1. PID feedback is less than the set value of PA-26 1. Check the PID feedback signal or set PA-26 to an appropriate value
29 Wave-by-wave current limiting fault ERR40 1. Is the load too large or is the motor blocked
2. Undersized selection of the inverter		 1. Reduce the load and check the motor and mechanical conditions
2. Choose a larger power rating inverter
30 Motor switch fault during operation ERR41 1. Change the current motor selection through terminals during inverter operation 1. Perform motor switching operation after the inverter stops
31 Motor overtemperature fault ERR45 1. Loose connection of temperature sensor wiring
2. Motor temperature is too high		 1. Check temperature sensor wiring and eliminate faults
2. Reduce frequency or take other cooling measures to dissipate heat from the motor
32 Initial position error ERR51 1. Motor parameters deviate too much from actual
2. Focus on whether the rated current is set too low		 1. Reconfirm motor parameters, focusing on whether the rated current is set too low

NEXT

Explore these documents to learn more.

Purchase high-performance vector frequency drives now. Table of Contents for the Variable Frequency Drive User Manual Frequently Asked Questions (FAQs) about Variable Frequency Drives
Chapter 7 Fault Diagnosis and Countermeasures7.2 Common Faults and Remediation Procedures