Revision 2016/03, 6ELE, V1.14 6-1
Chapter 6 Fault Code Information and Maintenance
6.1 Fault Code Information
The AC motor 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 motor drive digital keypad display. The five most recent faults can be read from
the digital keypad or communication.
Wait 5 seconds after a fault has been cleared before performing reset via keypad of input terminal.
6.1.1 Common Problems and Solutions
Name
Fault Descriptions Corrective Actions
Over current
Abnormal increase in current.
1. Check if motor power corresponds with the AC motor
drive output power.
2. Check the wiring connections to U/T1, V/T2, W/T3 for
possible short circuits.
3. Check the wiring connections between the AC motor
drive and motor for possible short circuits, also to
ground.
4. Check for loose contacts between AC motor drive and
motor.
5. Increase the Acceleration Time.
6. Check for possible excessive loading conditions at the
motor.
7. If there are still any abnormal conditions when operating
the AC motor drive after a short-circuit is removed and
the other points above are checked, it should be sent
back to manufacturer.
Over voltage
The DC bus voltage has exceeded
its maximum allowable value.
1. Check if the input voltage falls within the rated AC motor
drive input voltage range.
2. Check for possible voltage transients.
3. DC-bus over-voltage may also be caused by motor
regeneration. Either increase the Decel. Time or add an
optional brake resistor (and brake unit).
4. Check whether the required brake power is within the
specified limits.
Overheating
Heat sink temperature too high
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 from the heatsinks and
check for possible dirty heat sink fins.
4. Check the fan and clean it.
5. Provide enough spacing for adequate ventilation. (See
chapter 1)
Low voltage
The AC motor drive detects that the
DC bus voltage has fallen below its
minimum value.
1. Check whether the input voltage falls within the AC
motor drive rated input voltage range.
2. Check for abnormal load in motor.
3. Check for correct wiring of input power to R-S-T (for 3-
phase models) without phase loss.
The AC motor drive detects
excessive drive output current.
NOTE: The AC motor 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 in Pr.07.02.
3. Use the next higher power AC motor drive model.
To Next Page
Loading...
Need help?
General
