MN04002001E
16
March 2006
Step 5 — Troubleshooting Information
The AC drive has a comprehensive fault diagnostic system that includes several
different alarms and fault messages. Once a fault is detected, the corresponding
protective functions will be activated. The following faults are displayed as
shown on the AC drive digital keypad display. The three most recent faults can be
read on the digital keypad display by viewing 80.04 through 80.06.
Note:
Faults can be cleared by resetting at the keypad or with the Input Terminal.
Common Problems and Solutions
Fault
Name
Fault Descriptions
Corrective Actions
The AC drive detects an
abnormal increase in current.
1. Check that the motor horsepower
corresponds to the AC drive output power.
2. Check the wiring connections between the
AC drive and motor for possible short
circuits.
3. Increase the acceleration time (20.08).
4. Check for possible excessive loading
conditions at the motor.
5. If there are any abnormal conditions when
operating the AC drive after a short circuit is
removed, it should be sent back to
manufacturer.
The AC drive detects that the
DC bus voltage has exceeded
its maximum allowable value.
1. Check that the input voltage falls within the
rated AC drive input voltage.
2. Check for possible voltage transients.
3. Bus over-voltage may also be caused by
motor regeneration. Either increase the
deceleration time or add an optional braking
resistor.
4. Check whether the required braking power
is within the specified limits.
The AC drive temperature
sensor detects excessive heat.
1. Make sure that the ambient temperature
falls within the specified temperature range.
2. Make sure that the ventilation holes are not
obstructed.
3. Remove any foreign objects from the
heatsink and check for possible dirty
heatsink fins.
4. Provide enough spacing for adequate
ventilation.
The AC drive detects that the
DC bus voltage has fallen
below its minimum value.
Check that the input voltage falls within the
rated AC drive’s input voltage.
The AC drive detects excessive
drive output current.
Note: The AC drive can
withstand up to 150% of the
rated current for a maximum of
60 seconds.
1. Check if the motor is overloaded.
2. Reduce the torque compensation setting in
60.09.
3. Replace the AC drive with one that has a
higher output capacity (next hp size).
Internal electronic overload trip 1. Check for possible motor overload.
2. Check electronic thermal overload setting.
3. Increase motor capacity.
4. Reduce the current level so that the drive
output current does not exceed the value set
by the Motor Rated Current (60.01).
Motor overload. Check the
parameter settings (70.04
through 70.06)
1. Reduce the motor load.
2. Adjust the over-torque detection setting to
an appropriate setting.
MN04002001E.fm Page 16 Thursday, April 13, 2006 11:11 AM
