16
9. Troubleshooting
17
9. Troubleshooting
Table 9-2 Troubleshooting
Problem
Cause
Correction
Abnormal motor sounds
Foreign objects have entered
Confer with authorized maintenance shop.
Bearing damage
Confer with authorized maintenance shop.
Ser
vo tr
ipping
Overcurrent shut-off
Sudden speed changes
Increase the time for speed changes.
Extreme load fluctuation
Decrease load fluctuation.
Overcurrent due to ground fault Ground fault on output side
Take measures to prevent ground fault.
Direct current overcurrent
Short on output side
Take measures to prevent short.
Inspect wiring.
Regenerative overvoltage shut-off Sudden speed reduction
Increase the time for speed reduction.
Decrease brake frequency.
Thermal operation
Overload
Decrease the load to the specified value.
