Emerson Unidrive M400 Series User Manual page 148

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
22
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
• Use S Ramp Enable (02.006)
• 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
OI ac Instantaneous output over current detected
The instantaneous drive output current has exceeded Pr 11.061.
This trip cannot be reset until 10 s after the trip was initiated.
Recommended actions/checks:
• Increase acceleration/deceleration rate
• If seen during auto-tune reduce the voltage boost
3
• 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 - (Pr 04.013, Pr 04.014)
OI Snubber Snubber over-current detected
This trip indicates that an over-current condition has been detected in the rectifier snubbing circuit, The exact cause of the
trip can be identified by the sub-trip number.
Source
Power
system
92
Recommended actions:
• Ensure the internal EMC filter is installed.
• Ensure the motor cable length does not exceed the maximum for selected switching frequency.
• Check for supply voltage imbalance.
• Check for supply disturbance such as notching from a DC drive.
• Check the motor and motor cable insulation with an insulation tester.
• Fit an output line reactor or sinusoidal filter.
OI Brake Braking IGBT over current detected: short circuit protection for the braking IGBT activated
The OI Brake trip indicates that over current has been detected in braking IGBT or braking IGBT protection has been
activated. This trip cannot be reset until 10 s after the trip was initiated.
Recommended actions:
4
• Check brake resistor wiring
• Check braking resistor value is greater than or equal to the minimum resistance value
• Check braking resistor insulation
148
Electrical Getting Basic
installation started parameters
Source xx
01
Drive size
1 to 4
5
06200XXX
06400XXX
06500XXX
xx y
01 1
Running NV Media Card
Optimization
the motor Operation
y zz
0 zz Thermistor location in the drive defined by zz
Trip temperature (°C)
95
115
115
125
120
00: Rectifier snubber over current trip detected
Onboard Advanced
Diagnostics
PLC parameters
Description
Trip reset temperature (°C)
90
110
110
120
115
zz
Unidrive M400 Control User Guide
Issue Number: 1
UL
information