Unidrive M400 User Guide
181
Issue Number: 2
No power board
No power board
236
No communication between the power and control boards.
Recommended actions
:
•
Check connection between power and control board.
OHt Brake
Braking IGBT over-temperature
101
The
OHt Brake
over-temperature trip indicates that braking IGBT over-temperature has been detected based on software
thermal model.
Recommended actions:
•
Check braking resistor value is greater than or equal to the minimum resistance value
OHt Control
Control stage over temperature
219
This trip indicates that a control stage over-temperature has been detected if Cooling Fan control (06.045) = 0.
Recommended actions:
•
Increase ventilation by setting Cooling Fan control (06.045) > 0
OHt dc bus
DC bus over temperature
27
The
OHt dc bus
trip indicates a DC bus component over temperature based on a software thermal model. The drive
includes a thermal protection system to protect the DC bus components within the drive. This includes the effects of the
output current and DC bus ripple. The estimated temperature is displayed as a percentage of the trip level in Pr
07.035
. If
this parameter reaches 100 % then an
Oh.dc
trip is initiated. The drive will attempt to stop the motor before tripping. If the
motor does not stop in 10 seconds the drive trips immediately.
Recommended actions:
•
Check the AC supply voltage balance and levels
•
Check DC bus ripple level
•
Reduce duty cycle
•
Reduce motor load
•
Check the output current stability. If unstable;
Check the motor map settings with motor nameplate (Pr
05.006
, Pr
05.007
, Pr
05.008
, Pr
05.009
, Pr
05.010
,
Pr
05.011
) – (All Modes)
Disable slip compensation (Pr
05.027
= 0) – (Open loop)
Disable dynamic V to F operation (Pr
05.013
= 0) - (Open loop)
Select fixed boost (Pr
05.014
= Fixed) – (Open loop)
Select high stability space vector modulation (Pr
05.020
= 1) – (Open loop)
Disconnect the load and complete a rotating auto-tune (Pr
05.012
)
Reduce frequency loop gains (Pr
03.010
, Pr
03.011
, Pr
03.012
) – (RFC-A)
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
•
Increase acceleration / deceleration rates
•
Reduce motor load
•
Check DC bus ripple
•
Ensure all three input phases are present and balanced
Source
xx
y
zz
Description
Control system
00
2
00
DC bus thermal model gives trip with sub-trip 0
Source
xx
y
zz
Description
Control system
00
1
00
Inverter thermal model gives {Oht.I} trip with sub-trip 0
Summary of Contents for Unidrive M400
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