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Menu 10
Unidrive SP Advanced User Guide 167
Issue Number: 7 www.controltechniques.com
HF26 Soft start relay failed to close, soft start monitor failed or braking IGBT short circuit at power up
226 Hardware fault - return drive to supplier
HF27 Power stage thermistor 1 fault
227 Hardware fault - return drive to supplier
HF28 Power stage thermistor 2 fault or internal fan fault (size 3 only)
228 Hardware fault - return drive to supplier
HF29 Control board thermistor fault
229 Hardware fault - return drive to supplier
HF30 DCCT wire break trip from power module
230 Hardware fault - return drive to supplier
HF31 Aux fan failure from power module
231 Replace auxiliary fan
HF32 Power stage - a module has not powered up in a multi-module parallel drive
232 Check AC power supply
It.AC
Output current overload timed out (I
2
t) - accumulator value can be seen in Pr 4.19
20
Ensure the load is not jammed / sticking
Check the load on the motor has not changed
Tune the rated speed parameter (closed loop vector only)
Check feedback device signal for noise
Check the feedback device mechanical coupling
It.br
Braking resistor overload timed out (I
2
t) – accumulator value can be seen in Pr 10.39
19
Ensure the values entered in Pr 10.30 and Pr 10.31 are correct
Increase the power rating of the braking resistor and change Pr 10.30 and Pr 10.31
If an external thermal protection device is being used and the braking resistor software overload is not required, set Pr 10.30 or
Pr 10.31 to 0 to disable the trip
O.CtL Drive control board over temperature
23
Check cubicle / drive fans are still functioning correctly
Check cubicle ventilation paths
Check cubicle door filters
Check ambient temperature
Reduce drive switching frequency
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 cubicle / drive fans are still functioning correctly
Check cubicle ventilation paths
Check cubicle 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 cubicle / drive fans are still functioning correctly
Check cubicle ventilation paths
Check cubicle door filters
Increase ventilation
Decrease acceleration / deceleration rates
Reduce drive switching frequency
Reduce duty cycle
Reduce motor load
Trip Diagnosis
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