User Manual of EM760 High-Performance Inverter 219 E17 Abnormality of inverter temperature sensor The inverter temperature sensor is disconnected or short-circuited. 1. Seek technical support. E18 The soft start relay is not engaged. 1. The wiring gets loose. 2. The soft start relay fails. 1. Check the inverter wiring. 2. Seek technical support. E19 Error of current detection circuit The detection circuit of the drive board or control board is damaged. 1. Seek technical support. E20 Stall protection 1. The deceleration time is too short. 2. Error of dynamic brake for deceleration. 3. The load is too heavy. 1. Increase the deceleration time. 2. Check the dynamic brake. 3.
Check whether the motor cannot be stopped as it is driven by another load. E21 PID feedback disconnection 1. The PID feedback is greater than the upper limit (F09.24) or less than the lower limit (F09.25), depending on the type of the feedback sensor. 1. Check whether the feedback line falls off. 2. Check whether the sensor is working abnormally. 3. Adjust the detection value of feedback disconnection to a reasonable level. E22 Encoder fault 1. The encoder is not properly wired. 2. The PG card is not installed properly. 3. The PG card selected is not of the right type. 4. The encoder is damaged. 5. There is on-site interference. 1. Check the wiring of the PG card and encoder. 2.
Check whether the PG card is inserted properly. 3. Check the PG card type selected. 4. Replace the encoder. 5. Take electromagnetic compatibility measures (e.g. use of magnetic ring) for the inverter output cable. E23 Keyboard memory fails 1. Interference results in memory reading and writing errors. 2. The memory is damaged. 1. Press the STOP key for resetting and retry. 2. Seek technical support. E24 Self- identification error 1. Press the STOP key during parameter identification. 2. The external terminal stops working (FRS = ON) properly during parameter identification. 3. The motor is not connected. 4. The rotary self-learning motor is not disconnected from the load. 5. The motor fails.
1. Press the STOP key for resetting. 2. The external terminal should not be operated during parameter identification. 3. Check the connection between the inverter and motor. 4. Disconnect the rotary self-learning motor from the load. 5. Check the motor. E25 Moter overspeed protection 1. PG card is not connected 2. Encoder line count F01.25 is not properly set 3. AB phase sequence F01.27 is incorrect 4. Excessive load results in greater motor speed than the given inverter speed or reverse rotation of the motor 1. Connect the PG card or switch to V/F control 2. Set the encoder line count according to the encoder instructions 3. Exchange the A and B phase wiring ofthe encoder. 4.
Reduce the load or replace with an inverter and motor of the immediately greater power. E26 Load loss protection 1. The motor is not connected or does not match the load. 2. Load loss occurs. 3. The parameters of load loss protection are not set reasonably. 1. Check the wiring and use the appropriate motor 2. Check the equipment. 3. Change the off-load detection level F07.22 and detection time F07.23.