Specifications

7
VFD-G Series
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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
(Insulated Gate Bipolar
Transistor)
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.