User Manual of EM760 High-Performance Inverter 8.2.1 Failure in parameter setting of function codes ● The displayed parameters remain unchanged during the forward or reverse spinning ofthe digital potentiometer. When the inverter is in the running status, some code parameters cannot be modified without stopping the inverter. ● The displayed parameters can be modified but cannot be stored during the forward or reverse spinning of the digital potentiometer. Some function codes are locked and cannot be modified. When F12.02 is set to 1 or 2, parameter changes are restricted. Please set F12.02 to 0. Or, this occurs after the user password is set.
8.2.2 Abnormality of motor rotation ● When the RUN key on the keyboard is pressed, the motor does not rotate. ■ Terminal control of the start and stop: Check the setting of the function code F00.02. ■ The free stop terminal FRS and COM are closed: Disconnect the free stop terminal FRS from COM. ■ Switching of the running command to terminal is valid. In this case, the running command is only subject to terminal control. This will be invalid ifmodified. ■ The status combination of the running command channel is terminal control: Change it to keyboard control. ■ The reference input frequency is set to 0: Increase the reference input frequency.
■ The input power supply is abnormal or the control circuit fails. ● The control terminals RUN and F/R are ON, and the motor does not rotate. ■ Enabling of the stop function by the external terminal is invalid: Check the setting of function code F00.02. ■ Free stop terminal FRS=ON: Change the free stop terminal to FRS=OFF. ■ Control switch failure: Check the control switch. ■ The reference input frequency is set to 0: Increase the reference input frequency. ● The motor can only rotate in one direction. Reverse running is prohibited: When the reverse running prohibition code F00.21 is set to 1, the inverter is not allowed for reverse running. ● 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. 8.2.3 Too long acceleration time of motor ● The current limit level is too low. When the overcurrent limit setting is valid, and the output current ofthe 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.
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