Common Problems And Solutions; Chapter 7 Troubleshooting And Fault Information - Delta Electronics AC Drive VFD-F Series User Manual

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
Fault Descriptions
Name
The AC drive detects an
abnormal increase in
current.
The AC drive detects
that the DC bus voltage
has exceeded its
maximum allowable
value.
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Corrective Actions
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.
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 brake
resistor.
4. Check whether the required brake power
is within the specified limits.
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