benshaw.com
102
8
8. TROUBLESHOOTING AND SOLUTIONS
Fault Name
Operating
Panel Display
Cause
Possible Solution
Overvoltage
during
acceleration
Input voltage is too high.
Adjust input voltage to normal range.
An external force drives motor
during acceleration.
Cancel the external force or install
a braking resistor.
The overvoltage stall prevention
parameters are set improperly.
Ensure that the voltage limit function is enabled
(F3-23 = 1).
The setting of voltage limit (F3-22) is too high.
Adjust it between 770V and 700 V.
The setting of frequency gain for voltage limit
(F3-24) is too low. Adjust it between 30 and 50.
Braking unit and braking resistor
are not installed.
Install braking unit and braking resistor.
Acceleration time is too short.
Increase acceleration time.
Overvoltage
during
deceleration
The overvoltage stall prevention
parameters are set improperly.
Ensure that the voltage limit function is enabled
(F3-23 = 1).
The setting of voltage limit (F3-22) is too high.
Adjust it between 770V and 700 V.
The setting of frequency gain for voltage limit
(F3-24) is too low. Adjust it between 30 and 50.
An external force drives motor
during deceleration.
Cancel the external force or install a braking
resistor.
Deceleration time is too short.
Increase deceleration time.
Braking unit and braking resistor
are not installed.
Install braking unit and braking resistor.
Overvoltage
at constant
speed
The overvoltage stall prevention
parameters are set improperly.
Ensure that the voltage limit function is enabled
(F3-23 = 1).
The setting of voltage limit (F3-22) is too high.
Adjust it between 770V and 700 V.
The setting of frequency gain for voltage limit
(F3-24) is too low. Adjust it between 30 and 50.
The setting of frequency rise threshold during
voltage limit (F3-26) is too low. Adjust it between
5 Hz and 20 Hz.
An external force drives motor
during running.
Cancel the external force or install a braking
resistor.
Pre-charge
resistor fault
Bus voltage fluctuates around
undervoltage threshold
continuously.
Contact the agent or Benshaw.
Undervoltage
Instantaneous power
failure occurs.
Enable the power dip ride through function
(F9- 59 ≠ 0).
The AC drive’s input voltage is
not within the permissible range.
Adjust the voltage to normal range.
The bus voltage is abnormal.
Contact the agent or Benshaw.
The rectifier bridge, the buffer
resistor, the drive board or the
control board are abnormal.
Contact the agent or Benshaw.
AC drive
overload
Load is too heavy or locked-
rotor occurs on motor.
Reduce load or check motor and mechanical
conditions.
The AC drive power class
is low.
Replace with a drive of higher power class.
Motor
overload
F9-01 (Motor overload protection
gain) is set improperly.
Set F9-01 correctly.
Load is too heavy or locked- rotor
occurs on motor.
Reduce load or check motor and mechanical
conditions.
Input phase
loss
Input phase loss occurs.
Eliminate faults in external circuitry.
Drive board, lightning protection
board, control board, or rectifier
bridge is abnormal.
Contact the agent or Benshaw.
