Help with decoder noise...again

Help with decoder noise...again

Postby ConducTTor » Tue Feb 11, 2014 1:49 am

ESU decoders with Tillig (Buehler) motors - what motor settings are you guys using to keep things quiet? I've tried absolutely everything to get locos smooth/quiet. Will switch decoder brands if I don't find a solution (either Lenz or Zimo. Digitax, no thanks).
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Re: Help with decoder noise...again

Postby ConducTTor » Tue Feb 11, 2014 2:28 am

Update: shutting off the Back EMF does the trick. However, this results in the locomotive not moving until the throttle is at ~75%. VERY annoying.
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Re: Help with decoder noise...again

Postby Rich B » Tue Feb 11, 2014 5:18 am

For what it's worth, I've never found ESU decoders as smooth as Lenz or Zimo. If shutting off the BEMF helps, you could also try adjusting it in CVs 54 and 55. Depending on which ESU decoder it is you may also be able to adjust the PWM frequency in bit 1 of CV 49.

What's the loco's performance like on DC? If it needs a the controller opening up a way before starting off, a higher start voltage might help. I had one loco that I ended up creating a speed curve for with an high setting for step 1 to get over friction in the motor. I think some decoders have a feature that does this automatically (Kick voltage?), but I can't remember what brand that was- it wasn't Lenz or Zimo. It sounds like you loco might need something like this, as BEMF does generally compensate for such running qualities.
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Re: Help with decoder noise...again

Postby ConducTTor » Tue Feb 11, 2014 12:54 pm

The loco runs very well on DC - smooth and quiet. My experience with ESU and BEMF has not been good in general - always noisy no matter what with PWM changes not making much of a difference. I've played around with the speed curve and starting voltage (with BEMF off) but have not been able to get it to a good place :evil:
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Re: Help with decoder noise...again

Postby MacG » Tue Feb 11, 2014 5:00 pm

Has ESU not a self learning function? That the decoder find the best parameters for the motor? Me was so, but I don't know the CV for it..
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Re: Help with decoder noise...again

Postby ConducTTor » Tue Feb 11, 2014 5:43 pm

I didn't know such a function exists :shock:
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Re: Help with decoder noise...again

Postby Dibbedabb » Thu Feb 13, 2014 6:34 am

Yes, this function exists, but it doesn't change two things in the decoder:
1. The purr in the low speed steps
2. The decoder can start the motor very soft, but the stop is always with a jerk
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Re: Help with decoder noise...again

Postby ConducTTor » Thu Feb 13, 2014 11:56 am

:(
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Re: Help with decoder noise...again

Postby MacG » Thu Feb 13, 2014 4:19 pm

Autotune: Reset decoder with CV8=8 then http://www.moppe.dk/esuat.html

Some help with the parameters stands at the instruction manual.

I haven't found the parameters for a Buehler motor :(
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Re: Help with decoder noise...again

Postby ConducTTor » Fri Feb 14, 2014 12:29 am

MacG wrote:I haven't found the parameters for a Buehler motor :(


Me neither. And believe me I've tried so many parameter combinations :evil:
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