Common Fault Diagnosis and Solutions of VFD Output

Code No.:  E110

Overcurrent Error
- Inspect the condition of the motor load.
- Check whether the brake is released.
- Confirm whether the acceleration and deceleration time settings are reasonable.
- Verify whether motor self-tuning is functioning properly.
- Check if the motor is aged or has poor insulation, and confirm whether there is a short circuit to ground by measuring the motor's insulation resistance and checking if the motor current values are normal.
- Inspect the insulation to ground of the power cables, connection terminals, etc., and confirm whether the motor and its wiring are normal.
- Verify whether the motor's rotation direction is correct.
- Check if the encoder is loose and whether its wiring is normal, and rule out issues such as encoder Error, line interference, or PG card problems by running the system in open-loop mode (under no-load or light-load conditions) and observing its performance.
- Confirm whether the values of parameters P7.0 and P7.4 (overcurrent protection) are appropriate.
- Observe whether the three-phase currents of the motor are balanced;  consider swapping motors to help identify the specific issue if there is a motor of the same power nearby.
- If there is a contactor between the VFD and the motor, check whether the contactor opens or closes during the VFD's output voltage process.
- Confirm whether the VFD's internal current sensors and their wiring are normal.
- Consider replacing the power driver board or the VFD itself.

Code No.:  E111

Overload Error
- Check the motor load and confirm the load current. 
- Verify the settings of parameters P7.48 and P7.49. 
- Ensure that motor self-tuning is functioning properly. 
- Confirm that the motor's rotation direction is correct and observe whether the three-phase currents of the motor are balanced. 
- Verify that the motor and its wiring are normal.  Consider swapping motors to help identify the specific issue if there is a motor of the same power nearby.
- Check if the encoder is loose, if its wiring is normal and if there are any issues, such as encoder error, line interference or PG card problems, by running the system in open-loop mode (under no-load or light-load conditions) and observing its performance. 
- Confirm that there is no input phase loss and consider replacing power driver board or the VFD itself..

Code No.:  E112

Short Circuit to Ground
- Confirm that the setting of parameter P7.8 (zero-sequence current protection) is appropriate.  
- Check whether the motor is old and has poor insulation. Verify whether the motor has a short circuit to ground by measuring its insulation resistance. 
- Assess the insulation to ground of the power cable and connection terminals. 
- Ensure that the grounding wire of the VFD is properly connected. 
- Confirm that the current sensors and their wiring inside the VFD are functioning correctly. 
- For the rectifier feedback AFE module, if capacitor self-tuning has not been performed, an E112 alarm may be triggered when the load is excessive during operation. 
- When the length of the motor cable exceeds 100 m, take measures to reduce distributed capacitance (e.g. install an output reactor) or lower the carrier frequency. 
- Consider replacing power driver board or the VFD itself..

Code No.:  E113

Input Phase Loss Error
- Check whether the voltages between every two phases of the three-phase incoming lines of the VFD are normal; 
- Confirm that the input wiring of the VFD is properly connected; 
- Verify that the control wires on the linear filter board are correctly connected. if there is a linear filter board.

Code No.:  E114

Output Phase Loss Error
- Check for any wire breakages, incorrect wiring or loose connections in the output cable. 
- Confirm that the motor windings are intact and that the motor is functioning properly. 
- Measure the inter-wire resistance of the motor and inspect it for normal operation. 
- Observe whether the three-phase currents of the motor are balanced and confirm that the motor and its wiring are normal.  Swap motors to identify the specific issue if there is a motor with the same power rating nearby. 
-Disconnect the motor and measure the three-phase output voltages from the terminals of the VFD to check whether they are normal. 
-If the motor has a capacity lower than 5% of the VFD's rated output current, consider replacing power driver board or the VFD itself..

Code No.:  E118

Encoder Error
- Verify that the encoder's electrical connections and the P20.14 and P20.15 parameter settings are correct. 
- Determine the encoder cable's wiring and grounding condition of the shielding wire. 
- Confirm that the encoder is securely fastened and that its wiring is normal.
- Observe the operational performance with open-loop operation under no-load or light-load conditions and rule out issues such as encoder malfunction, line interference or PG card problems. 

Code No.:  E119

Speed Anomaly
- Verify that the encoder's electrical connections and the settings for parameters P20.14 and P20.15 are correct. 
- Confirm the settings for parameters P7.31 and P7.32. 
- Determine the encoder cable's wiring, identify any wire breakages and check the grounding condition of the shielding wire. 
- Ensure that the encoder is firmly secured and that its wiring is normal. 
- Observe the operational performance with open-loop operation under no-load or light-load conditions and rule out issues such as encoder malfunction, line interference or PG card problems. 

Code No.:  E156

Hardware Overcurrent 
- Check the motor load; 
- Verify whether the brake is released; confirm the acceleration and deceleration times; 
- Ensure that the motor and its wiring are normal, and confirm that there are no short circuits to ground at the VFD terminals, external cables, or the motor; 
- Confirm whether the output current of the VFD is excessively high.