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Old 21-06-2018, 07:52 PM   #1
ScottC
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Default Hornby J94 DCC Conversion

Evening all,

I've fitted a Lenz Standard+ V2 decoder in my Hornby J94 this evening, however, although I have followed the destructions (Here: J94 DCC), it is still running in reverse... forward goes back and back goes forward!

Has anyone converted one of these or similar that could possible tell me what i'm doing wrong?

Thanks.
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Old 21-06-2018, 08:14 PM   #2
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Seem to remember about changing CV29 by one to change direction, and I haven’t a clue what that means.
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Old 21-06-2018, 09:03 PM   #3
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Either swap around the Red & Black wires or check CV29......if it reads an odd number deduct 1, if it's an even number add 1.........here is the CV29 calculator...... http://www.2mm.org.uk/articles/cv29%20calculator.htm .......HB
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Old 22-06-2018, 12:00 AM   #4
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Perfect! Sorted - just had to adjust the CV by 1 as you suggested.

Thanks both.
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Old 22-06-2018, 06:26 PM   #5
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Scott, well done. Most new to dcc are scared stiff of hard wiring a decoder when its very simple as you have found out - the one thing to watch is any wires soldered together are well insulated (heat shrink being the usual solution). With regard to changing CVs I would recommend Decoder Pro which allows you to program decoders on your pc without needing to know the specific CV to change nor what value to enter.
http://jmri.org/help/en/html/apps/De...ro/index.shtml
With the Power Cab you have it would need an interface to link the Power Cab to the pc
https://www.dccconcepts.com/product/...-for-powercab/
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Old 22-06-2018, 06:31 PM   #6
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Wow I was correct.
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Old 22-06-2018, 09:28 PM   #7
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Just to note....Swapping the Red & Black wires does not reverse direction. Swapping the motor feed wires (Orange and Grey) will do this. As will alerting CV29, by adding 1 to the existing value.

The previously linked CV29 calculator is worth bookmarking... http://www.2mm.org.uk/articles/cv29%20calculator.htm
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Old 22-06-2018, 11:56 PM   #8
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Quote:
Originally Posted by Mike Parkes View Post
the one thing to watch is any wires soldered together are well insulated (heat shrink being the usual solution).
All connections have heat shrink on them so there should be no chance of a short from within the loco. Thanks for the links too - On problem I have is that most programs seem to be designed for Windows, but I run on the Mac OS.

Quote:
Originally Posted by Flashbang View Post
Swapping the Red & Black wires does not reverse direction. Swapping the motor feed wires (Orange and Grey) will do this. As will alerting CV29, by adding 1 to the existing value.
I did try swapping the motor feed over too, but it jut shorted, so reverted back to what it said in the destruction manual and by amending CV29 by 1, it works perfectly.
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Old 23-06-2018, 05:11 PM   #9
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Quote:
Originally Posted by ScottC View Post
On problem I have is that most programs seem to be designed for Windows, but I run on the Mac OS.
Decoder Pro works on Macs http://jmri.org/install/MacOSX.shtml
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Old 23-06-2018, 05:35 PM   #10
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I bought some liquid insulation for those connections where you cannot get heat shrink over it, such as tapping into the bus or soldering to little stubs on sugar cube speakers.
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