182
Unidrive M400 User Guide
Issue Number: 2
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
•
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 Rectifier
Rectifier over temperature
102
The
Oht Rectifier
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 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 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
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].
Summary of Contents for Unidrive M400
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