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Bachmann 31-932DC Midland Compound DCC


RJdeVries

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Hello,

 

 

I've recently purchased a Midland Compound loco from Bachmann.

 

post-18079-0-37886200-1383480729_thumb.jpg

 

The loco came with a Bachmann decoder, this one has been removed.

The quality of motor control wasn't up to my standard, thats just me :)

 

So, I've removed the decoder and the 21Mtc Pcb and fitted an

ESU Lokpilot V4.0 decoder instead, just hardwired it on to the small 

Pcb that also contains the plug that connects the tender and loco together.

 

post-18079-0-43886900-1383480102_thumb.jpg

 

The small Pcb near the decoder is for soldering the wires from the loco lights.

A couple of Smd resistors are placed on it, there 4700 ohm a piece.

The Lanterns are from Bachmann, I've drilled them out with a pin vice and fitted

them with an Smd led in yellow, wired with coilwire.

 

post-18079-0-41439000-1383480206_thumb.jpg

 

The Smd's are glued in place with Kristal Clear, this also forms a lens.

 

In order to fit them to the loco 2 holes where drilled in near the mounting posts.

0,5mm in diameter, enough to pull the wires trough.

 

post-18079-0-15571100-1383480336_thumb.jpg

 

The loco will carry the Class A or 1 code for an express passenger service.

I've also taken the tender into the works, all the small items where placed, and

the fake peice of coal was removed, there is a layer of real coal in the tender now.

The loss of the weight of the fake coal is a problem, this has been mended with a 

plaque of lead inside of the tender housing, sticked into place with double sided tape.

 

post-18079-0-05318000-1383480436_thumb.jpg

 

It's not a waiting game, until the Kristal Clear is dry there is nothing to do yet.

 

I'll update again soon.

 

Greetings,

 

Robbert Jan.

 

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And she's finished, the lanterns are in place and wired up to the small pcb

that's shown in the first post.

Both are wired individually to a function output, make's it possible to even

switch them on one at a time.

 

post-18079-0-98601200-1383661484_thumb.jpg

 

post-18079-0-02129700-1383661512_thumb.jpg

 

The wires are approx 30cm long from lantern to pcb, with a bit of excess lenght 

stuffed away in the tender housing, there is room enough there.

 

Some programming later the lights have been tempered by the decoder.

(Back EMF it's called I think)

The adress has been set to a high adress 4093 via Cv 17 and 18 and Cv29 @ 34.

 

Both function outputs have been linked together under key F0 and are set to work

in forward aswell as the reverse direction.

 

And at last the Coal was dry, it took a while :)

 

post-18079-0-42554000-1383661540_thumb.jpg

 

Another project finished, wheathering is next.

 

Greetings,

 

Robbert Jan.

 

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  • 3 months later...

Hello

RJdeVries

Nice work. I have recently fitted Lok Pilot 4's to a Bachmann Midland Compound, a 4F and a 7F. The problem has arisen that they all spring away from a standstill when l select speed step 1 and then slow down to normal at speed step 4 (DCC - 28 speed steps - speed via cv's 2,5,6).

Any ideas?

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Hello,

 

 

I've had the exact same problem, and tuned the Cv's values listed below;

 

Cv 51 set to 8 (this Cv is not present in some editions of the manual, yet it is present in the firmware of the decoder)

Cv 52 set to 9

Cv 53 set to 200

Cv 54 set to 10

Cv 55 set to 128

Cv 56 set to 255 (standard value)

 

This should result in the loco not jumping when moving from a standstill.

 

The Cv values below represent the programming that I did in the Cv 2 trough 6.

 

Cv 2 set to 1

Cv 3 set to 64

Cv 4 set to 64

Cv 5 set to 70

Cv 6 set to 35

 

This will hopefully resolve the issues, good luck!

 

Regards,

 

Robbert Jan.

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  • 2 months later...

I have fitted a LokSound v 4 to my 41157 and it works well on a rolling road.  I did a lot of research on the effect of compounding on the sound synchronization and finally realized that it is a simple two cylinder beat from the low pressure outside cylinders!  Diagrams from the NRM helped in this assessment.

 

As to the lamps, I am having to tussle with this and have decided that no lighting is the best way forward.  My layout is an MPD "somewhere in the Midlands" and as such the locomotives would not show lamps anyway.  But a light engine arriving or leaving the shed should have the lower central lamp in place.

 

This is just my opinion but the Springside and Bachmann white lamps look too large unless they are greyed out a bit, something I will be doing to my Standard 4MT when I am within reach of my weathering kit.

 

I like the real coal - my tender coal comes from a disused open cast mine to the north of Béziers in southern France.  Nothing quite like the real thing!

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