User Guide of EM730 Series Inverter The motor rotates in the opposite direction. The output phase sequence of the inverter is inconsistent with the input phase sequence of the motor: Exchange any two of the motor wires in the power-off status to change the rotation direction of the motor. 6.2.3 Too long acceleration time of motor The current limit level is too low. When the overcurrent limit setting is valid, and the output current of the inverter reaches the set current limit, the output frequency will remain unchanged during acceleration, until the output current is less than the limit. Then the output frequency will continue to rise.
This makes the acceleration time of the motor longer than the set time. Check whether the set current limit of the inverter is too low. The set acceleration time is too long. Please check the acceleration time code. 6.2.4 Too long deceleration time of motor When energy consumption braking is valid: The resistance of the braking resistor is too high, and the energy consumption braking power is too low, which extends the deceleration time. The set value of braking rate (F15.32) is too small, which extends the deceleration The set deceleration time is too long. Check the deceleration time code. time. Increase the set value of braking rate. When the stall protection is valid:
When the overvoltage stall protection is enabled, and the DC bus voltage exceeds the voltage of overvoltage stall (F07.07), the output frequency will remains unchanged; and when the DC bus voltage is lower than F07.07, the output frequency will continue to drop, which extends the deceleration time. The set deceleration time is too long. Check the deceleration time code. 6.2.5 Electromagnetic interference and RF interference Since the inverter works in the high-frequency switching status, electromagnetic interference and RF interference will be generate to the control device. The following measures can be taken. Reduce the carrier frequency (F00.23) of the inverter.
Install a noise filter on the input side of the inverter. 52