Delta Electronics AC Motor Drive VFD-G - Manual (Page 152)

Revision July 2008, EG03, SW V1.06 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 four 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 or input terminal.
6.1.1 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.