MN04002001E
17
March 2006
Step 5 — Troubleshooting Information (Continued)
Common Problems and Solutions (Continued)
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 60.09.
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 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).
Internal memory cannot be
programmed.
1. Switch off power supply.
2. Check whether the input voltage falls within
the rated AC drive input voltage.
Switch the AC drive back on.
Internal memory cannot be
read.
1. Check the connections between the main
control board and the power board.
2. Reset the drive to factory defaults.
Hardware protection failure Return the drive to the factory.
Software protection failure Return the drive to the factory.
Drive’s internal circuitry is
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.
The external terminal DI1-COM
goes from OFF to ON.
When external terminal DI1-COM is closed, the
drive’s output will be turned off and will display
EF.
Auto acceleration/deceleration
failure
Don’t use the auto acceleration/ deceleration
function.
Ground fault:
The AC drive output is abnormal.
When the output terminal is
grounded (short circuit current is
50% more than the AC drive
rated current), the AC drive
power module may be damaged.
The short circuit protection is
provided for AC drive protection,
not user protection.
Ground fault:
1. Check whether the IGBT power module is
damaged.
2. Check for possible poor insulation on the
output wires or on the motor.
External Pause.
AC drive output is turned off.
1. When the external input terminal (pause) is
active, the AC drive output will be turned off.
2. Disable this (pause) and the AC drive will
begin to work again.
MN04002001E.fm Page 17 Thursday, April 13, 2006 11:11 AM
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