Fault Conditions
57
21
Reduce drive switching frequency Reduce duty cycle Decrease acceleration / deceleration rates
Reduce motor load
O.ht2 Heatsink over temperature
22
Check cooling fans, ventilation path, and filters.
Increase ventilation.
Decrease acceleration / deceleration rates.
Reduce drive switching frequency.
Reduce duty cycle.
Reduce motor load.
Oht2.P Power module heatsink over temperature.
105
Check fans, ventilation paths, and filters.
Increase ventilation.
Decrease acceleration / deceleration rates.
Reduce drive switching frequency.
Reduce duty cycle.
Reduce motor load.
O.ht3 Drive over temperature based on thermal model.
27
Drive will attempt to stop the motor before tripping. If the motor does not stop in 10s, the drive
will trip.
Check fans, ventilation paths, and filters.
Increase ventilation.
Decrease acceleration / deceleration rates.
Reduce duty cycle.
Reduce motor load.
Oht4.P Power module rectifier over temperature.
102
Check for supply imbalance.
Check fans, ventilation paths, and filters.
Increase ventilation.
Decrease acceleration / deceleration rates.
Reduce drive switching frequency.
Reduce duty cycle.
Reduce motor load.
OI.AC Instantaneous output over current detected: peak output current greater than 225%.
3
Acceleration / deceleration rate is too short.
If seen during autotune, reduce voltage boost Pr 5.15.
Check for short circuit on output cabling.
Check integrity of motor insulation.
Check feedback device wiring.
Check feedback device mechanical coupling.
Check feedback signals are free from noise.
Is motor cable length within limits for that frame size?
Reduce the values in speed loop gain parameters - Pr 3.10, Pr 3.11, and Pr 3.12 (closed loop
vector)
Table 20. CT Drive Fault Displays
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