13
Troubleshooting and Fault Information
The AC drive has a comprehensive fault diagnostic system that includes several different
alarms and fault message. Once a fault is detected, the corresponding protective functions
will be activated to shut down the AC drive output. Below are the fault descriptions, for a
fault shown on the AC drive digital keypad. After fault has been cleared, switch the
Run/Stop key to stop mode to reset the drive.
Fault Display
Fault Descriptions
Corrective Actions
Alarm LED lighten after
power on
Hardware failure
Return to the factory
Alarm LED flashes once
in every two seconds
The AC drive
detects an
abnormal increase
in current
(Over-current)
1. Increase the acceleration time
2. Check whether the motor output power
corresponds to the AC drive output
power
3. Check the wiring connection between the
AC drive and motor for possible short
circuit
4. Check for possible over loading
conditions at the motor
Alarm LED flashes twice
in every two seconds
(Over-voltage)
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 be caused by
motor regeneration, increase the
accel/decel time.
Alarm LED flash thrice in
every two seconds
(Overload)
Motor overload
1. Check for possible motor overload.
2. Adjust torque detection setting of the DIP
SW4 to an appropriate setting.
3. Increase the AC Drive’s output capacity.
Alarm LED flashes four
times in every two
seconds
(Over-heating)
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. Provide enough spacing for adequate
ventilation.
Alarm LED flashes five
times in every two
seconds
(Low voltage)
The AC drive
detects that the
DC Bus Voltage
has fallen below
its minimum value.
Check whether the input voltage falls within
the rated AC Drive input voltage.
Alarm LED flashes
Change DIP SW
while drive is
running
Switch the Run/Stop key to Stop mode to
reset the AC drive.
