User guide

112 Unidrive SP Short Form Guide
www.controltechniques.com Issue Number: 2
O.ht1 Power device over temperature based on thermal model
21
Reduce drive switching frequency
Reduce duty cycle
Decrease acceleration / deceleration rates
Reduce motor load
O.ht2 Heatsink over temperature
22
Check enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
Check enclosure door 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 enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
Check enclosure door 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
The drive will attempt to stop the motor before tripping. If the motor does not stop in 10s the drive
trips immediately.
Check enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
Check enclosure door filters
Increase ventilation
Decrease acceleration / deceleration rates
Reduce duty cycle
Reduce motor load
Oht4.P
Power module rectifier over temperature or input snubber resistor over temperature (size
4 and above)
102
Check for supply imbalance
Check for supply disturbance such as notching from a DC drive
Check enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
Check enclosure door 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 and servo modes only)
Has offset measurement test been completed? (servo mode only)
Reduce the values in current loop gain parameters - Pr 4.13 and Pr 4.14 (closed loop vector
and servo modes only)
Trip Diagnosis