VFD Error Codes Troubleshooting Guide
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VFD Error Codes Troubleshooting Guide
This guide lists common VFD (Variable Frequency Drive) fault codes, their possible causes, and countermeasures to help you quickly diagnose and resolve issues with your CNC router.
| Fault Code | Fault Type | Possible Cause | Countermeasure |
|---|---|---|---|
| Err02 | Acceleration overcurrent | 1. Too short acceleration time 2. Low voltage 3. Small frequency converter selection |
1. Increase acceleration time 2. Set the voltage to the normal range 3. Frequency converter power increase |
| Err03 | Deceleration overcurrent | 1. Too short deceleration time 2. Low voltage 3. No additional brake resistor |
1. Increase deceleration time 2. Set the voltage to the normal range 3. Install brake resistor |
| Err04 | Constant speed overcurrent | 1. Low voltage 2. If a sudden load added 3. Small frequency converter selection |
1. Set the voltage to normal 2. Cancel sudden load 3. Frequency converter power increase |
| Err05 | Acceleration overvoltage | 1. High input voltage 2. In acceleration, an external force driving motor running 3. The acceleration time is too short 4. No brake resistor |
1. Set the voltage to normal 2. Cancel external force or install brake resistor 3. Increase acceleration time 4. Add brake resistor |
| Err06 | Deceleration overvoltage | 1. High input voltage 2. An external force driving motor running in deceleration 3. The deceleration time is too short 4. No brake resistor |
1. Set the voltage to normal 2. Cancel external force or add brake resistor 3. Increase deceleration time 4. Add brake resistor |
| Err07 | Constant speed overvoltage | 1. High input voltage 2. An external force driving motor running in running |
1. Set the voltage to normal 2. Cancel external force or add brake resistor |
| Err08 | Control power fault | The input voltage is not within the specified range | Set the voltage to normal |
| Err09 | Undervoltage | 1. The input voltage of the inverter is not within the specified range 2. Abnormal bus voltage 3. Abnormal rectifier bridge and buffer resistance anomaly 4. Abnormal control board |
1. Reset failure 2. Adjust the voltage to the normal range 3. Seek technical support |
| Err10 | Frequency converter overload | 1. Too large load or the motor shutoff 2. Small frequency converter selection |
1. Reduce the load and check the motor and machinery 2. Select a higher power inverter |
| Err11 | Motor overload | 1. Motor protection parameter P9-01 set properly? 2. Too large load or motor shutoff 3. Small frequency converter selection |
1. Set this parameter correctly 2. Reduce load and check motor and machinery 3. Select higher power frequency converter |
| Err12 | Input missing phase | 1. Abnormal input power supply 2. Abnormal driver board 3. Abnormal main control board |
1. Check and remove faults in outer lines 2. Seek technical support |
| Err13 | Output missing phase | 1. Abnormal lead from frequency converter to motor 2. In motor running, the three-phase output of the inverter unbalanced 3. Abnormal driver board |
1. Remove outer faults 2. Check motor three-phase winding and remove faults 3. Seek technical support |
| Err14 | Inverter module overheating | 1. High ambient temperature 2. Air duct obstruction 3. Fan damage 4. Module thermal resistor damage |
1. Reduce the ambient temperature 2. Clear the air duct 3. Replace fan 4. Replace thermal resistor |
| Err15 | External equipment fault | 1. Input external fault signal through multifunction terminal X 2. Input the external fault signal through the virtual IO function |
1. Reset operation |
| Err16 | Communication fault | 1. Abnormal upper computer 2. Abnormal communication line 3. Incorrectly set communication Pd group parameter |
1. Check the upper computer wiring 2. Check the communication connection 3. Correctly set the communication parameters |
| Err17 | Contactor fault | 1. Abnormal driver board and the power supply 2. Abnormal contactor |
1. Replace drive or power board 2. Replace contactor |
| Err18 | Current detection fault | 1. Check the abnormal Hall device 2. Abnormal driver board |
1. Replace Hall device 2. Replace drive board |
| Err19 | Motor tuning fault | 1. Motor parameters are not set according to nameplate 2. Timeout parameter identifying |
1. Set the motor parameters correctly according to the nameplate 2. Check lead from frequency converter to motor |
| Err21 | EEPROM reading and writing fault | 1. EEPROM chip damage | 1. Replace main control board |
| Err26 | Running time reach fault | 1. The cumulative run time reaches the set value | 1. Using the parameter initialization function to clear the record information |
| Err29 | Power on time reach fault | 1. The cumulative power on time reaches set value | 1. Using the parameter initialization function to clear the record information |
| Err30 | Load drop fault | 1. Inverter running current less than P9-64 | 1. Confirm if the load is separated or if the P9-64 P9-65 parameters are in accordance with the actual running conditions |
| Err31 | PID running feedback loss | 1. PID feedback less than PA-26 set value | 1. Check the PID feedback signal or set the PA-26 to an appropriate value |
| Err40 | Wave-by-wave limiting current fault | 1. Too large load or the motor shutoff | 1. Reduce load and check motor and mechanical conditions |
| Err41 | Running switching motor fault | 1. Change present motor selection by terminal during inverter running | 1. Motor switching operation after frequency converter stops |
Summary: Always ensure your VFD is installed in a well-ventilated area with stable voltage. If you encounter a fault code not listed here or cannot resolve the issue, please contact OMIOCNC technical support for assistance.