Specifications

7
VFD-G Series
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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.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).
The external terminal EF-GND
goes from OFF to ON.
1. When external terminal EF-GND is
closed, the output will be turned off.
(Under N.O. E.F.)
2. Press RESET after fault has been
cleared.
Emergency stop.
When the multi-function input
terminals (MI1 to MI6) stop,
AC drive stops any output.
Press RESET after fault has been
cleared.
Software protection failure Return to the factory.