Revision July 2009, SW V1.1
5-1
Chapter 5
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 or communication.
NOTE
Wait 5 seconds after a fault has been cleared before pressing RESET key.
5.1 Common Problems and Solutions
Fault
Name
Fault Descriptions
Corrective Actions
Over current
Abnormal increase in current.
1. Check if motor power corresponds with the AC
motor drive output power.
2. Check the wiring connections to U/T1, V/T2,
W/T3 for possible short circuits.
3. Check the wiring connections between the AC
motor drive and motor for possible short
circuits, also to ground.
4. Check for loose contacts between AC motor
drive and motor.
5. Increase the Acceleration Time (Pr.01-09, 01-
11)
6. Check for possible excessive loading conditions
at the motor.
Over voltage
The DC bus voltage has
exceeded its maximum
allowable value.
1. Check if the input voltage falls within the rated
AC motor drive input voltage range.
2. Check for possible voltage transients.
3. DC-bus over-voltage may also be caused by
motor regeneration. Either increase the Decel.
Time or add an optional brake resistor.
Overheating
Heat sink temperature too high
1. Ensure that the ambient temperature falls within
the specified temperature range.
2. Remove
any
foreign
objects from the heatsinks
and check for possible dirty heat sink fins.
3. Provide enough spacing for adequate
ventilation.
Protection circuit error
(HPF.1, HPF.2, HPF.3)
Return to the factory
Summary of Contents for VFD-L-I Series
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