A90 series Inverter User Guide 6 Troubleshooting 6.1 Faults When something abnormal happens to inverter, keypad will display corresponding fault code and parameter; the fault relay is on, the fault output terminal is on, inverter output stops. If motor is still running when a fault occurs, it will stop by the setting mode. For A90 faults and troubleshooting, see Table 6-1. Table 6-1 A90 Faults and Troubleshooting 32 Fault Fault type Cause Troubleshooting Code E01 Short Circuit/ electromagnetic interference 1. Short circuit between output phase and ground 2. Short circuit between output phases 3. Short circuit of brake resistor 4. Acceleration/deceleration time is too short 5.
Power module is damaged 6. Electromagnetic interference 1. Check if there is any short circuit phenomenon. 2. Extend acceleration/ deceleration time 3. Investigate causes and reset inverter after taking appropriate measures. 4. Seek for technical support. E02 Instantaneous Overcurrent 1.Acceleration/deceleration time is too short. 2.Under V/F control mode, V/F curve has been set irrationally. 3.Motor is running when inverter starts. 4.Motor exceeds inverter capacity or load is too heavy. 5. The motor parameters aren’t correct 6. Short circuit between inverter output phases 7. The inverter is damaged 1.Extend acceleration/ deceleration time. 2.Set V/F curve rationally.
3.Enable the track start or start DC brake. 4.Replace with an appropriate motor or inverter. 5.Perform motor autotune. 6.Check if there is any short circuit. phenomenon in wiring. 7.Seek for technical support. E03 Instantaneous Overvoltage 1.Deceleration time is too short and regenerated energy is too large. 2.Brake unit or brake resistor does not work. 3.The brake unit or brake resistor does not match. 4.Power supply voltage is too high. 5.The function of dynamic braking is not enabled 1.Extend deceleration time. 2.Check the brake unit and brake resistor wiring, and enable F15.30 for built-in models. 3.With the appropriate brake unit / brake resistor.
4.Reduce the power supply voltage down to a specified range. E04 Stable Overcurrent Refer to E02 Refer to E02 E05 Stable Overvoltage Refer to E03 Refer to E03 E06 Undervoltage 1.Input voltage phase loss. 2.Wiring terminals of input are 1.Check the input voltage and wiring.