Back EMF Settings on Locoman Zimo Black 5 Decoder

[chrismontgomery83]

Hi All,

 

I'm new to the forum, and pretty new at tuning CV's in DCC, So I'm hoping there will be someone out there that can provide some advise.

 

So I've fitted the decoder and speakers in the loco, the loco operates as it should and the sound also works.

 

There is a slight issue with the timings of the sounds;

 

1 - When the drain cocks close and the loco is supposed to start moving and then progress onto the next sound file, being low speed chuff's the following occurs

     - Drain cocks sound and close, there is then a slight pause, the first chuff then sounds, then the loco starts to creep forwards.

 

2 - When the loco is then in motion, the chuff's aren't synchronised with the wheel movement

 

I'm pretty sure this is just because some settings need to be adjusted slightly, as not every loco runs the same, however I just don't know which CV's I need to adjust and what effect they should have. I assume that it's the back EMF settings that I need to adjust, but I'm no expert.

 

Any help would be greatly appreciated,

 

Chris

 

 

[RedgateModels]

CV 267 is the value you need to adjust, takes a while to get it right. Helps if you have a rolling road

[chrismontgomery83]

Hi,

 

Thanks for that, I tried to adjust cv #302 to 75 for the loco to complete its EMF run but the loco just remained stationary.

 

I think I will have to invest on a rolling road, as trying to set it up on a small layout is pretty difficult.

[RedgateModels]

BEMF is unlikely to be the problem. Stream sound decoders will almost always need the chuff rate tweaking as even with the same type of loco the motor characteristics will be different. You also have no idea which of the very many black fives produced over the years the sound scheme was developed for.

 

Leave BEMF alone and get the chuff rate right

[chrismontgomery83]

Hi,

 

Yeah I figured that they won't all perform the same, if I can tune it so its close back EMF won't be needed.

 

Thanks again for your help

[chrismontgomery83]

Hi,

 

So I've managed to get the Chuff rate right, and BEMF wasn't need as was suggested.

 

I'm still having the problem that the loco isn't moving during the drain cock's sound is playing, it only starts to move once this sound is completed, I'd like to be able to get the loco to start creeping forward during this sound file. Anyone out there got any tips on how I would do this?

 

Video of what I'm talking about

 

I would also like to know how to disable the automatic sounds when at standstill, they're driving me crazy. I've already consulted the Zimo manual and made some changes here, but the result was either no sound function at all or the automatic sounds still kept playing. I've set them back to what they were originally now. Does anyone know the correct CV and setting number for this.

 

Thanks in advance

 

Chris

[RedgateModels]

Chris, the draincock sequencing might be fixed in the sound scheme. 

 

Locoman would be the best to comment on this and your question about random sounds

[chrismontgomery83]

Hi,

 

So apparently it isn't possible for the loco to move during the drain cocks opening sound is active. A little disappointing as the loco would certainly have been creeping forwards with them open.

[Rowsley17D]

Hi,

 

So apparently it isn't possible for the loco to move during the drain cocks opening sound is active. A little disappointing as the loco would certainly have been creeping forwards with them open.

 

See Charlie's (Locoman) reply in the DCC Sounds forum.