Delta VFD-L series User Manual page 75

Fault
Fault Descriptions
Name
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.
Over-current during
deceleration:
1. Short-circuit at motor
output.
2. Deceleration time too
short.
3. AC drive output
capacity is too small.
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.
The external terminal
EF-GND goes from OFF
to ON.
Internal memory IC can
not be programmed.
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Corrective Actions
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 the AC drive with one that has a
higher output capacity (next HP size).
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).
1. Check for possible poor insulation at the
output line.
2. Check for possible motor stall.
3. Replace the AC drive with one that has a
higher output capacity (next HP size).
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.
1. Return to the factory.
2. Check the EEPROM on the control
board.
7-3
VFD-L Series
7