User Manual of A90 Series Inverter
261
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.
9.2.3 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.
9.2.4 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 time. Increase the set value of braking rate.
The set deceleration time is too long. Check the deceleration time code.
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.
