Delta Electronics VFD-M Series, User Manual

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Revision May 2008, ME14, SW V3.04 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 three most recent faults can be read from the digital keypad by viewing Pr.73 to Pr.75.
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.
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 (Pr.10,
Pr.12).
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
brake resistor.
4. Check whether the required braking
power is within the specified limits.