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Chapter 6 fault code information and maintenance, 1 fault code information, 1 common problems and solutions – Delta Electronics AC Motor Drive VFD-E User Manual

Page 222: 1 fault code information -1, 1 common problems and solutions -1

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Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11

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.

NOTE

Wait 5 seconds after a fault has been cleared before performing reset via keypad of input terminal.

6.1.1 Common Problems and Solutions

Fault

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.