User Guide of EM730 Series Inverter 49 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. E24 Self-identificatio n error 1.
Press the STOP/RESET 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/RESET key to reset. 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. 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. E27 Up to cumulative power-on time 1. The inverter maintenance time is up. 1. Please contact the dealer for technical support. E28 Up to cumulative running time 1. The inverter maintenance time is up. 1. Please contact the dealer for technical support. E44 Wiring protection 1. The valid time of the wiring detection terminal is too long. 2. The invalid time of the wiring detection terminal is too long. 1. Check whether the sensor can work normally. 2. Check whether the terminal is capable of properly judging the closing and opening.
E57 Overpressure in pipeline network 1. The feedback pressure in the water supply application is too high. 1. Check whether the sensor is in the abnormal status. 2. Check the analog terminal for normal detection of analog input.