Watt Drive V2500 Series Manual page 38

CHAPTER 7: TROUBLESHOOTING AND FAULT INFORMATION
Fault Name Fault Descriptions
The AC drive detects that
the DC bus voltage has
fallen below its minimum
value.
The AC drive detects
excessive drive output
current.
Note: The AC drive can
withstand up to 150% of
the rated current for a
maximum of 60 seconds.
Internal electronic
overload trip
Motor overload. Check
the parameter settings
(Pr.6-03 to Pr.6-05)
Communication Error
Over-current during
acceleration:
1. Short-circuit at motor
output.
2. Torque boost too high.
3. Acceleration time too
short.
4. AC drive output
capacity is too small.
Over-current during
deceleration:
1. Short-circuit at motor
output.
2. Deceleration time too
short.
3. AC drive output
capacity is too small.
Corrective Actions
Check whether the input voltage falls within the
rated AC drive's input voltage.
1. Check whether the motor is overloaded.
2. Reduce torque compensation setting as set
in Pr.7-02.
3. Increase the AC drive's output capacity.
1. Check for possible motor overload.
2. Check electronic thermal overload setting.
3. Increase motor capacity.
4. Reduce the current level so that the drive
output current does not exceed the value set
by the Motor Rated Current Pr.7-00.
1. Reduce the motor load.
2. Adjust the over-torque detection setting to
an appropriate setting (Pr.06-03 to
Pr.06-05).
1. Check the connection between the AC drive
and computer for loose wires.
2. Check if the communication protocol is
properly set.
1. Check for possible poor insulation at the
output line.
2. Decrease the torque boost setting in
Pr.7-02.
3. Increase the acceleration time.
4. Replace the AC drive with one that has a
higher output capacity (next HP size).
1. Check for possible poor insulation at the
output line.
2. Increase the deceleration time.
3. Replace with the AC drive with one that has
a higher output capacity (next HP size).
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