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Troubleshooting
Fault Codes
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 fault codes are then displayed on the
digital keypad display. The three most recent faults can be read on the digital
keypad display by viewing 6-31 to 6-36.
NOTE: Faults can be cleared by a reset from the keypad or input terminal.
GS1 Series AC Drive User Manual
6–3
Chapter 6: Maintenance and Troubleshooting
Fault Codes
Fault Name Fault Descriptions Corrective Actions
oc
The AC drive detects an abnormal
increase in current.
1. Check whether the motor's 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 (1-01 or 1-05).
4. Check for possible excessive loading conditions at the
motor.
5. If there are any abnormal conditions when operating
the AC drive after short-circuit is removed, the AC
drive should be sent back to the manufacturer.
ou
The AC drive detects that the DC
bus voltage has exceeded its
maximum allowable value.
1. Check whether 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 decel time or add an
optional braking resistor.
4. Check whether the required braking power is within
the specified limits.
oX
The AC drive temperature sensor
detects excessive heat.
1. Ensure 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 on the heatsinks and
check for possible dirty heat sink fins.
4. Provide enough spacing for adequate ventilation.
Lu
The AC drive detects that the DC
bus voltage has fallen below its
minimum value.
Check whether the input voltage falls within the AC
drive’s rated input voltage.
oL
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 whether the motor is overloaded.
2. Reduce torque compensation setting as set in 2-03.
3. Increase the AC drive’s output capacity.