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Old 11-08-2019, 01:10 PM   #1 (permalink)
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Exclamation DCC for Accucraft K-28

Here I go,

I am in the process of installing DCC in my K-28. I have purchased a decoder, Digitrax DG583S and followed the instruction that came with the Loco. Basically, itís to unscrew the track and motor wires from the accucraft power distribution board and screw them into the appropriate spot on the board. I did that.

Here's my problem:

I think there is a short, the DCC controller beeps and the train stops moving or it just moves slowly backwards and I cannot control it. If i block the Loco off the rails and have the tender only on the rails, i am able to control it, but the speed in really slow at 100%. I have already spoken to Digitrax to the point that it is not a decoder problem it is a Loco problem.

Questions:

Has anybody had the same issue? If so, how did you resolve it?
Am I doing all this wrong?
Is there a better or different DCC decoder that I should be using?

Thanks, Bodey
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Old 11-08-2019, 10:20 PM   #2 (permalink)
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Hmmm... I’ll be watching this! I’m having the same issue with my Accucraft C&S 2-8-0 consolidation without dcc

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Old 11-08-2019, 11:15 PM   #3 (permalink)
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First thing, I would have suggested an all in one decoder like Zimo. Do you have the motor wiring isolated?
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Old 11-09-2019, 08:21 AM   #4 (permalink)
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If this engine is a metal frame then the short can be related to one rail tied to the frame. This is one thing I have found with many metal engines.
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Old 11-09-2019, 11:41 AM   #5 (permalink)
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Check the wiring. The work force isn't very educated. An Ohm meter is your friend.

From a different company I found a short between the tender trucks. Looked like all tangs were in a row and wired the same, then a truck was turned 180 to install and the wires crossed.Just an example, not necessarily your problem.
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Old 11-09-2019, 08:34 PM   #6 (permalink)
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Standard DCC installation method is to test the track pickups first, to make sure they properly connect to each rail AND there is no connection between them.


Only then connect to the decoder.



Then, put some power to the motor wires and see that you have the right wires, only then connect to the decoder.


Now put it on a programming track in service mode and see if you can "talk" to the decoder.


If you have made any errors in wiring, the low voltage and current on the programming track almost always saves you from destroying things.


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Old 11-10-2019, 05:54 PM   #7 (permalink)
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Treeman,

Yes, I believe I have the motor wires isolated. They were isolated to the Accucraft board. I will also look into a Zimo decoder. Any idea where online would have good information since Zimo seem to be a UK business?

Dan,

Yes, the Loco is metal but, it runs perfectly with analog. I would think it would short with analog as well.

Thanks, Bodey
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Old 11-10-2019, 08:55 PM   #8 (permalink)
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Zimo is from Austria, and there are several people knowledgeable in Zimo here.



Bodey, the wiring of the loco is a little nuts, and running fine on analog DEFINITELY DOES NOT GUARANTEE the wiring is ok for DCC.


I can give you tons of examples, but how about just following my advice instead?


I gave some simple steps, and if you follow them you will be fine. If you believe that pulling the wires without testing is fine, then you can have all kinds of problems.


(shades of Aristocraft and Bachmann and LGB !!!)



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Old 11-10-2019, 09:04 PM   #9 (permalink)
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Don't trust the Accucraft wiring, could be connected to the body.

http://www.zimo.at/web2010/products/...rgrosse_EN.htm

They have good Amercian sound files, may require a payment for download.

You could also look at TSU, Tsunami, Phoenix.
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Old 11-11-2019, 08:15 AM   #10 (permalink)
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When a manufacturer uses the metal chassis for one power lead, one must guarantee nothing is tied to the frame. Otherwise you will get realtime smoke but only once as the decoder burns up!!!! Analog will be OK, DCC will not be OK.
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