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Chapter 6 Fault Code Information and Maintenance|

6-4 Revision June 2007, 0ELE, V1.00

Fault

Name Fault Descriptions Corrective Actions

Ground fault

When (one of) the output terminal(s) is grounded,

short circuit current is more than 50% of AC motor

drive rated current, the AC motor drive power

module may be damaged.

NOTE: The short circuit protection is provided

for AC motor drive protection, not for

protection of the user.

1. Check whether the IGBT power module is

damaged.

2. Check for possible poor insulation at the

output line.

Auto accel/decel failure

1. Check if the motor is suitable for operation by

AC motor drive.

2. Check if the regenerative energy is too large.

3. Load may have changed suddenly.

Communication Error

1. Check the RS485 connection between the AC

motor drive and RS485 master for loose wires

and wiring to correct pins.

2. Check if the communication protocol, address,

transmission speed, etc. are properly set.

3. Use the correct checksum calculation.

4. Please refer to group 9 in the chapter 5 for

detail information.

Software protection failure Return to the factory.

Analog signal error Check the wiring of ACI

PID feedback signal error

1. Check parameter settings (Pr.10.01) and

AVI/ACI wiring.

2. Check for possible fault between system

response time and the PID feedback signal

detection time (Pr.10.08)

Phase Loss Check input phase wiring for loose contacts.

Chapter 6 Fault Code Information and Maintenance|

Revision June 2007, 0ELE, V1.00 6-5

6.1.2 Reset

There are three methods to reset the AC motor drive after solving the fault:

1. Press key on keypad.

2. Set external terminal to “RESET” (set one of Pr.04.05~Pr.04.08 to 05) and then set to be

ON.

3. Send “RESET” command by communication.

NOTE

Make sure that RUN command or signal is OFF before executing RESET to prevent damage or

personal injury due to immediate operation.

6.2 Maintenance and Inspections

Modern AC motor drives are based on solid-state electronics technology. Preventive maintenance is

required to keep the AC motor drive in its optimal condition, and to ensure a long life. It is

recommended to have a qualified technician perform a check-up of the AC motor drive regularly.

Daily Inspection:

Basic check-up items to detect if there were any abnormalities during operation are:

1. Whether the motors are operating as expected.

2. Whether the installation environment is abnormal.

3. Whether the cooling system is operating as expected.

4. Whether any irregular vibration or sound occurred during operation.

5. Whether the motors are overheating during operation.

6. Always check the input voltage of the AC drive with a Voltmeter.

Periodic Inspection:

Before the check-up, always turn off the AC input power and remove the cover. Wait at least 10

minutes after all display lamps have gone out, and then confirm that the capacitors have fully

discharged by measuring the voltage between ~ . It should be less than 25VDC.