Cv29 how to adjust for a speedy loco after short circuit

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Cv29 how to adjust for a speedy loco after short circuit

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Puttputtmaru		#1 Posted : 31 January 2024 00:30:05(UTC) Retweet
Joined: 15/02/2021(UTC) Posts: 201 Location: Quebec, Montreal		Ok after some programming of new stuff or a short circuit when I turn on my CS3 a couple of times a loco start running away. I only have Marklin MFX locos. From what I gather from decoder manual, I need; « mfx/DCC operation: Locomotives standing on the layout start running suddenly during mfx registration. – Deactivate the automatic analog recognition on these locomotives » From what I have read it seems to be cv29 that need s to be dealt with. My question is, before I start changing stuff that I do not know much about, Am I right? And if so what numbers do I need to change in CV29 and from what to what? Thanks


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PeFu		#2 Posted : 31 January 2024 06:14:27(UTC) Retweet
Joined: 30/08/2002(UTC) Posts: 1,210		Yes, short circuits could cause this feature on engines that are enabled for analogue operation. First you read CV29. If you get 0-3 or 32-35, analogue operation is already disabled on this engine. For any other value, decrease the value you get by 4. Program CV29 with that value. Example: I read CV29 and get 6 (which is the default value of e.g. mLD3 decoders). 6-4=2, therefore i program CV29 with value 2. For non-Märklin decoders, I would always refer to the manual for finding out CV:s… However, it sounds strange to me that some locos start ”running away” after programming decoders. Are you programming on the programming track, or on the main layout tracks (PoM)? I’m always programming on the programming track. To simplify programming of non-engine decoders (such as turnout decoders), I added a separate ”sugar cube” terminal from the CS programming track output, for temporary connections in addition to the physical programming track.
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Puttputtmaru		#3 Posted : 31 January 2024 15:38:32(UTC) Retweet
Joined: 15/02/2021(UTC) Posts: 201 Location: Quebec, Montreal		Originally Posted by: PeFu Yes, short circuits could cause this feature on engines that are enabled for analogue operation. First you read CV29. If you get 0-3 or 32-35, analogue operation is already disabled on this engine. For any other value, decrease the value you get by 4. Program CV29 with that value. Example: I read CV29 and get 6 (which is the default value of e.g. mLD3 decoders). 6-4=2, therefore i program CV29 with value 2. For non-Märklin decoders, I would always refer to the manual for finding out CV:s… However, it sounds strange to me that some locos start ”running away” after programming decoders. Are you programming on the programming track, or on the main layout tracks (PoM)? I’m always programming on the programming track. To simplify programming of non-engine decoders (such as turnout decoders), I added a separate ”sugar cube” terminal from the CS programming track output, for temporary connections in addition to the physical programming track. Thanks for the answer and thanks for really answering it to the point and with clarity. Yes I do program on my « regular track » for other things than locos. My layout is a temporary one for now just to get the hang of it before I start my real new layout. (Been out of the hobby for a while, digital was none existant at the time). I will start a programming track « sugar cube ». THANKS.

1 user liked this useful post by Puttputtmaru		PeFu
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