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Unidrive M100 User Guide 129
Issue Number: 1
Oht.P 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
• Increase 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.r Rectifier over temperature
102
The Oht.r trip 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 speed by setting Pr 06.045 = 1
• Check enclosure / drive fans are still functioning correctly
• Check enclosure ventilation paths
• Check enclosure door filters
• Increase ventilation
• Increase acceleration / deceleration rates
• Reduce duty cycle
• Reduce motor load
OI.A1 Analog input 1 over-current
189 Current input on analog input 1 exceeds 24mA.
OI.AC Instantaneous output over current detected
3
The instantaneous drive output current has exceeded VM_DRIVE_CURRENT_MAX.
Recommended actions/checks:
• Increase acceleration/deceleration rate
• If seen during autotune reduce the voltage boost
• Check for short circuit on the output cabling
• Check integrity of the motor insulation using an insulation tester
• Is the motor cable length within limits for the frame size?
• Reduce the values in the current loop gain parameters
Trip Diagnosis
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
Source xx y zz Description
Control
system
00 0 00
Instantaneous over-current trip when the measured a.c. current
exceeds VM_DRIVE_CURRENT[MAX].