User manual

Chapter 7 Troubleshooting and Fault Information

100

Chapter 7 Troubleshooting and Fault 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 to shut down the AC drive output. Below are the fault descriptions, for a fault

shown on the AC drive digital keypad display. The three most recent faults can be read on the

digital keypad display by viewing Pr.6-08 to Pr.6-10

NOTE: After faults occurred, press RESET to begin using the drive again.

Common Problems and Solutions:

Fault

Name

Fault Descriptions Corrective Actions

The AC drive detects an

abnormal increase in

current.

1. Check whether the motors 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 (Pr.1-09, Pr.1-11).

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 being removed, it should

be sent back to manufacturer.

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.

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.