User manual

Chapter 7 Troubleshooting and Fault Information
© 1999 DELTA ELECTRONICS, INC. ALL RIGHTS RESERVE
101
Fault
Name
Fault Descriptions Corrective Actions
The AC drive detects that
the DC bus voltage has
fallen below its minimum
value.
1. Check whether the input voltage falls within the rated AC
drive’s input voltage.
1. 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.
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.
Internal electronic
overload trip
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.
Motor overload. Check
the parameter settings (
Pr.6-03 to Pr.6-05)
1. Reduce the motor load.
2. Adjust the over-torque detection setting to an
appropriate setting.
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.
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 with the AC drive with one that has a higher
output capacity (next HP size).