Delta VFD-L Series

7
VFD-L Series
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
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 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 the AC drive with one that has
a
higher output capacity (next HP size).
The external terminal
EF-GND goes from OF
F
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.
Internal memory IC can
not be programmed.
1
. Return to the factory.
2
. Check the EEPROM on the control
board.