Emerson Unidrive M400 User Manual page 182

Safety Product Mechanical
information information installation
OHt Power Power stage over temperature
This trip indicates that a power stage over-temperature has been detected. From the sub-trip 'xxyzz', the Thermistor
location is identified by 'zz'.
Power system
Recommended actions:
• Check enclosure / drive fans are still functioning correctly
• Force the heatsink fans to run at maximum speed
22
• 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
Rectifier over temperature
OHt Rectifier
The Oht Rectifier trip indicates that a rectifier over-temperature has been detected. The thermistor location can be identified
from the sub-trip number.
Source
Power
system
Recommend actions:
102
• 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 ac Instantaneous output over current detected
The instantaneous drive output current has exceeded VM_DRIVE_CURRENT_MAX.
Source
Control
system
3
Recommended actions/checks:
• Increase acceleration/deceleration rate
• If seen during auto-tune 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 frequency loop gain parameters - (Pr 03.010, 03.011, 03.012) or (Pr 03.013, 03.014, 03.015)
• Reduce the values in the current loop gain parameters
182
Electrical Getting Basic Running
installation started parameters the motor
Source xx
01
xx y
Power module Rectifier
number number
xx y
00 0
NV Media Card Onboard
Optimization
Operation
y zz
0 zz Thermistor location in the drive defined by zz
zz
zz Thermistor location defined by zz
zz
Instantaneous over-current trip when the measured a.c. current
00
exceeds VM_DRIVE_CURRENT[MAX].
Advanced
Technical data Diagnostics
PLC parameters
Description
Description
Description
Unidrive M400 User Guide
UL listing
information
Issue Number: 2