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270 Powerdrive F300 User Guide
Issue Number: 2
OHt Inverter Inverter over temperature based on thermal model
21
This trip indicates that an IGBT junction over-temperature has been detected based on a software thermal model.
Recommended actions:
• Reduce the selected drive switching frequency
• Ensure Auto-switching Frequency Change Disable (05.035) is set to OFF
• Reduce duty cycle
• Decrease acceleration / deceleration rates
• Reduce motor load
• Check DC bus ripple
• Ensure all three input phases are present and balanced
OHt Power Power stage over temperature
22
This trip indicates that a power stage over-temperature has been detected. From the sub-trip ‘xxyzz’, the Thermistor
location is identified by ‘zz’.
Recommended actions:
• Check enclosure / drive fans are still functioning correctly
• Force the heatsink fans to run at maximum speed
• Check enclosure ventilation paths
• Check enclosure door filters
• Increase ventilation
• Reduce the drive switching frequency
• Reduce duty cycle
• Decrease acceleration / deceleration rates
• Reduce motor load
• Check the derating tables and confirm the drive is correctly sized for the application.
• Use a drive with larger current / power rating
OHt Rectifier Rectifier over temperature
102
The OHt Rectifier indicates that a rectifier over-temperature has been detected. The thermistor location can be identified
from the sub-trip number.
Recommend actions:
• Check the motor and motor cable insulation with an insulation tester
• Fit an output line reactor or sinusoidal filter
• Force the heatsink fans to run at maximum speeds by setting Pr 06.045 = 11
• 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
Trip Diagnosis
Source xx y zz Description
Control system 00 1 00 Inverter thermal model gives {OHt Inverter} trip with sub-trip 0
Source xx y zz Description
Power system 01 0 zz Thermistor location in the drive defined by zz
Source xx y zz Description
Power
system
Power module
number
Rectifier
number
zz Thermistor location defined by zz
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