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What can cause an bLF or brake control fault on the ATV630 and ATV930 Process drives?

Published date: 25 September 2018

Issue:
What can cause an bLF or brake control fault on the ATV630 and ATV930 Process drives?

Product Line:
ATV630 and ATV930 Process drives

Environment:
All 

Cause:
Wrong setting of the parameter IBR (Brk Release Current)
Bad fluxing of motor ( 5*tr ).(tr = Rotor time constant).
Incorrect values of auto tuning (check in expert mode TRM).


Resolution:
 
Principle:
This fault appears when the brake logic is used and the conditions to open the brake are not
present.
If the brake release current (parameter IBR) is not attained after a delay (parameter
BRR+100ms) or it is impossible to flux the motor during 5*tr ( tr = Rotor time constant ) then
the fault appears.
Probable cause:
- wrong setting of the parameter IBR (Brk Release Current)
Bad fluxing of motor ( 5*tr ).(tr = Rotor time constant).
Incorrect values of auto tuning (check in expert mode TRM).
Remedies:
Check the drive/motor connections.
Check the motor wending
Check the IBR (current for brake opening while ascending) and IRD (current for brake opening
while descending) settings.
Check the setting of bEn (brake closing frequency)
Check the parameter BRR   Current ramp time ( only in expert mode ).

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