14
Fault
Name
Fault Descriptions
Corrective Actions
Over-current during acceleration:
1. Short-circuit at motor output.
2. Torque boost too high.
3. Acceleration time too short.
4. AC drive output capacity is too
small.
1. Check for possible poor insulation at the
output line.
2. Decrease the torque boost setting in Pr.7-02.
3. Increase the acceleration time.
4. Replace with the AC drive with one that has a
higher output capacity (next HP size).
Over-current during deceleration:
1. Short-circuit at motor output.
2. Deceleration time too short.
3. AC drive output capacity is too
small.
1. Check for possible poor insulation at the
output line.
2. Increase the deceleration time.
3. Replace with the AC drive with one that has a
higher output capacity (next HP size).
Over-current during steady state
operation:
1. Short-circuit at motor output.
2. Sudden increase in motor loading.
3. AC drive output capacity is too
small.
1. Check for possible poor insulation at the
output line.
2. Check for possible motor stall.
3. Replace with the AC drive with one that has a
higher output capacity (next HP size).
Internal memory IC can not be
programmed.
1. Switch off power supply.
2. Check whether the input voltage falls within
the rated AC drive input voltage.
3. Switch the AC drive back on.
Internal memory IC can not be read.
1. Check the connections between the main
control board and the power board.
2. Reset drive to factory defaults.
Drive’s internal circuitry abnormal.
1. Switch off power supply.
2. Check whether the input voltage falls within
the rated AC drive input voltage. Switch on
the AC drive.
Hardware protection failure
Return to the factory.
Software protection failure
Return to the factory.
Auto accel/decel failure
Don’t use the function of auto acceleration/
deceleration.
Communication Error
1. Check the connection between the AC drive
and computer for loose wires.
2. Check if the communication protocol is
properly set.
External Base Block.
AC drive output is turned off.
1. When the external input terminal (B.B) is
active, the AC drive output will be turned off.
2. Disable this connection and the AC drive will
begin to work again.
The AC drive detects excessive drive
output current.
1. Check whether the motor is overloaded.
2. Reduce torque compensation setting as set in
Pr.7-02.
3. Increase the AC drive’s output capacity.
4.
Note:
The AC drive can withstand up to 150%
of the rated current for a maximum of 60
seconds.
