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7
VFD-F Series
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
7-3
Fault
Name
Fault Descriptions
Corrective Actions
OC hardware error Return to the factory.
OV hardware error Return to the factory.
OH hardware error Return to the factory.
Communication Error
1. Check the connection between the AC
drive and computer for loose wires.
2. Check if the communication protocol is
properly set.
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).