Delta PG-40 Dokumentacja Pobierz pdf (Strona 114)

VFD-B Series

7-1

CHAPTER 7 Troubleshooting and Fault Information

The AC 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 drive digital keypad display. The four most recent

faults can be read on the digital keypad display.

NOTE: Faults can be cleared by a reset from the keypad or Input Terminal.

Common Problems and Solutions:

Fault

Name

Fault Descriptions

Corrective Actions

The AC drive detects an

abnormal increase in

current.

IGBT protection

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.

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.

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