开云体育

  1. Jmriusers
  2. Topics

Locked How to set BEMF cutoff?

 

Hi Folks,
I'm reading up on BEMF/BEMF cutoff and am still a bit confused.
I'm interested in having a switcher locomotive have better slow speed operation.?
I looked at Decoder Pro and the BEMF cutoff value was 0.
I tried changing it to 10 and it seems to run better at slow speeds but I wanted to understand what the values mean?
If I set the BEMF cutoff to say 10, vs 30, what does that mean?
I'm guessing it means to use BEMF up until the speed step 10, then don't?
Thanks for any intuitive explanations of how to set this value.
Regards
?
 

How BEMF works or is controlled is decoder dependent. You need to read the manuals for those decoders.
Not really a JMRI issue.

--
Peter Ulvestad

JMRI Users Group Moderator ( )
Tam Valley Group Moderator ( )
Sprog-DCC Group Moderator ( )
Edmonton Model Railroad Association ( )
 

开云体育

ChrisR:

?

Control of BEMF is different for different manufacturers. What brand of decoder are you using?

?

Mark Granville
 

This site may be helpful to you:


--
Peter Ulvestad

JMRI Users Group Moderator ( )
Tam Valley Group Moderator ( )
Sprog-DCC Group Moderator ( )
Edmonton Model Railroad Association ( )
 

开云体育

ChrisR:

I’d still like to know the decoder involved. I’ve looked in several manufacturer’s technical manuals and not found “cutoff” associated with BEMF. In any case, if it is low speed you are concerned about, you want cutoff to be disabled. Slow speed performance is where BEMF shines. You do not want it cutting off.

Mark Granville
 

Mark,

He has since posted on the Soundtraxx group TSU-1100

--
Peter Ulvestad

JMRI Users Group Moderator ( )
Tam Valley Group Moderator ( )
Sprog-DCC Group Moderator ( )
Edmonton Model Railroad Association ( )
 

开云体育

He has since posted on the Soundtraxx group TSU-1100.

Thanks Peter. He will hopefully get an answer there. Soundtraxx references their Tsunami2 technical manual for the TSU-1100. I find no mention of “cutoff” among the BEMF parameters. I sure would like to know where he is reading the term “cutoff”, but I’m not going to join the Soundtraxx group just to find out. Too many groups already and I don’t use Soundtraxx decoders.

Mark Granville
 

--
Peter Ulvestad

JMRI Users Group Moderator ( )
Tam Valley Group Moderator ( )
Sprog-DCC Group Moderator ( )
Edmonton Model Railroad Association ( )

Screenshot from 2024-09-03 11-19-53.png

 

The Tooltip for CV="10" item="EMF Feedback Cutout" default="0"
tooltip="Up to 127, this sets the speed step above which the intensity of BEMF control will be reduced to zero. Values over 127 cause the BEMF to decrease as a percentage (up to 50%)."
BEMF Cutout (0-127 or 128-255)

--
Peter Ulvestad

JMRI Users Group Moderator ( )
Tam Valley Group Moderator ( )
Sprog-DCC Group Moderator ( )
Edmonton Model Railroad Association ( )

1 - 9 of 9