7
7-3
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.54.
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.
The external terminal EF-GND
goes from OFF to ON.
When external terminal EF-GND is closed, the
output will be turned off (under N.O. E.F.).
Auto accel/decel failure
Don’t use the function of auto acceleration/
deceleration.
B550 Series sensorless vector frequency drive
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