User manual

Chapter 7 Troubleshooting and Fault Information
© 1999 DELTA ELECTRONICS, INC. ALL RIGHTS RESERVE
102
Fault
Name
Fault Descriptions Corrective Actions
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.)
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.
Drive’s internal circuitry
abnormal.
1. Switch off power supply.
2. Check whether the input voltage falls within the rated AC
drive input voltage. Switch on the AC drive.
Hardware protection
failure
1. Return to the factory.
Software protection
failure
1. Return to the factory.