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.