6–3
Chapter 6: Maintenance and Troubleshooting
DURAPULSE AC Drive User Manual
1st Ed. Rev. D 05/2013
Troubleshooting
Fault Messages
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 messages are then displayed on
the digital keypad LCD display. The six most recent faults can be read on the
digital keypad display by viewing parameters P06.31 to P06.36.
NOTE: Faults can be cleared by a reset from the keypad or input terminal.
Fault Messages
Fault Name/Description Corrective Actions
The AC drive detects an abnormal increase
in current.
1. Check whether the motor's horsepower is equal to or less than
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 (P 1.01 or P 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, or fault does not clear, call ADC
Support for assistance.
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.
5. Check braking resistor on drives under 20HP and dynamic brake
unit & braking resistor on drives 20HP and above.
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 heat sinks and check for
possible dirty heat sink fins.
4. Provide enough spacing for adequate ventilation.
The AC drive detects that the DC bus
voltage has fallen below its minimum
allowable value.
Check whether the input voltage falls within the rated AC drive
input voltage.
The AC drive detects excessive drive
output current.
1. Check whether the motor is overloaded.
2. Reduce torque compensation setting as set in P 2.03.
3. Increase the AC drive’s output capacity.
Note: The AC drive can withstand up to 150% of the
rated current for a maximum of 60 seconds.
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