Common Problems And Solutions; Chapter 7 Troubleshooting And Fault Information - Watt Drive V2500 Series Manual

CHAPTER 7 Troubleshooting and Fault Information

The AC drive has a comprehensive fault diagnostic system that includes several different
alarms and fault messages.
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
The AC drive detects an
abnormal increase in
current.
IGBT protection
The AC drive detects that
the DC bus voltage has
exceeded its maximum
allowable value.
The AC drive
temperature sensor
detects excessive heat.
Once a fault is detected, the corresponding protective
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 braking
resistor.
4. Check whether the required braking power
is within the specified limits.
1. Ensure that the ambient temperature falls
within the specified temperature range.
2. Make sure that the ventilation holes are not
obstructed.
3. Remove any foreign objects on the
heatsinks and check for possible dirty heat
sink fins.
4. Provide enough spacing for adequate
ventilation.
7-1
Corrective Actions
7