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Offline RayF  
#1 Posted : 03 August 2012 22:51:12(UTC)
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RayF

Gibraltar   
Joined: 14/03/2005(UTC)
Posts: 15,870
Location: Gibraltar, Europe
I'm thinking of getting a 3071 for my collection. What's the best way to convert it to digital?

I gather the train has a pick-up shoe changeover. Can Marklin decoders handle this? Would a seperate relay be required?

Any advice would be appreciated.

Thanks,

Ray
Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
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Offline mike c  
#2 Posted : 04 August 2012 02:17:57(UTC)
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mike c

Canada   
Joined: 28/11/2007(UTC)
Posts: 8,225
Location: Montreal, QC
Ray, if you are considering getting a 3071 plus a 4071, you should consider the 3471 (delta) or 37900 (c-sine) versions of the trainset. The 39700 Set will cost a little more than the 3471, but in addition to being ready for use on delta/digital layouts, the two newer models come equipped with interior details and lighting.

You may also want to consider one of the Roco models or even convert the Trix 22131 to AC. I have the RailTop/LSM model as well as the 3471 in my collection. I tested the RailTop model on R1 and R2 and it worked fine, although it did hangover on the curves a little bit. I did not test on S-curves or switches.

As far as the Maerklin models, you may want to install an additional weight in the pilot coach, as the coach can derail due to insufficient weight on the forward (cab) bogie.

Regards

Mike C
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Offline RayF  
#3 Posted : 04 August 2012 10:12:57(UTC)
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RayF

Gibraltar   
Joined: 14/03/2005(UTC)
Posts: 15,870
Location: Gibraltar, Europe
Thanks for the info, Mike.

I'm specifically asking about converting the 3071 as I'm currently bidding for one on ebay.
Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
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Offline RUBEN SPAIN  
#4 Posted : 04 August 2012 20:28:11(UTC)
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RUBEN SPAIN

Spain   
Joined: 19/12/2011(UTC)
Posts: 112
Location: Madrid Spain
Hello.
I have the 3070 (it is the same but with interior lights) with 4070 coach, digitalized.

First you must change motor stator with ESU magnet to convert it to a DC motor that can be controlled by a decoder.

I installed a ESU lokpilot V3.0 in the motor head coach. To prevent flickering on ligths you can install a 1microF capacitor between the front (and another for the rear) light. The capacitor +pole must be connected to mass. To protect the decoder you should also install a 1n4007 diode between the yellow (and another one to white) wire and the connection of the lamps. The catode of diode (the side with a grey stripe) must be connected to the decoder wire because the decoders voltage is negative. And you should limit the lights output of the decoder to a value of 6-9. The capacitor rises the voltage to higher values

For the head coach without motor I installed a function decoder lokpilot V3.0 only for lights. The same with capacitors and diodes to prevent flickering.

Both decoders must have the same address.

It is important you can not have any electrical connection between both head coaches.

If you want interior ligthing in the coaches you can connect one coach lights to the aux1 (green wire) or aux 2 (violet wire) from the main (motor control of head coach) decoder.

The other coach and the dummy head coach lights can be connected to aux 1 and aux 2 of the functions decoder.

You can install LED lights in the coaches (for interior lighting) so you can avoid the connection to mass and the return wire is the one with blue colour.


Regards
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Offline RayF  
#5 Posted : 04 August 2012 21:43:20(UTC)
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RayF

Gibraltar   
Joined: 14/03/2005(UTC)
Posts: 15,870
Location: Gibraltar, Europe
Thanks Ruben,

I hadn't considered using a function decoder for the driving trailer. It saves having to wire throught the coaches.

What about the pick-up shoe switchover? Did you just decide to do without the function?
Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
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Offline Western Pacific  
#6 Posted : 04 August 2012 22:10:38(UTC)
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Western Pacific

Sweden   
Joined: 19/09/2009(UTC)
Posts: 841
Location: Lidingö, Sweden
Ray,

Have you had a look at marklin-users.net member Intruder's home page?

Svein's Märklin site. You can either click your way via "Digital conversions" to that of 3071 or go there via this direct link.

In my mind that description gives you very good suggestions on how to do a digital conversion of the 3071.
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Offline jvuye  
#7 Posted : 04 August 2012 22:16:36(UTC)
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jvuye

Belgium   
Joined: 01/03/2008(UTC)
Posts: 2,883
Location: South Western France
Originally Posted by: RayF Go to Quoted Post
Thanks Ruben,

I hadn't considered using a function decoder for the driving trailer. It saves having to wire throught the coaches.

What about the pick-up shoe switchover? Did you just decide to do without the function?


Hello Ray
I have converted several of these, relatively easy to do.
Yes, by all means, make the changeover to a permanent magnet motor, I did all mine that way.
It is a flat collector motor, get the proper conversion kit.

Now for the "subtle" part: pick up change over.

I recommend using ESU's 51966 (http://www.esu.eu/en/products/accessories/change-over-of-skis/) which double up as a 21 pin connector, so if one day you want to upgrade to Loksound, no problem.
Just wire and you're done!

If you don't want to use that, you can simply use the 51963 relay (http://www.esu.eu/en/products/accessories/miniature-relays/) or any small relay working on 12 volt, to swithch between pick up skis.
Use the power unit front light output to activate the relay and set it to"power from motor unit"
The reverse light output wire (F0 r) goes to the red bulb of teh power unit.

Make sure that when on "rest" the relay provides power from the driving trailer.

This way it will always work, even if you forget to turn on the headlights, you'll get at least power from the driving trailer

Of course, besides the pick up switch over, there would still be no "true" changeover for the headlights on the driving trailer, so the white bulb will merely "blind out" the red, as in the original wiring.

You can add another (identical) little relay , activated by the pilot car "white" light power line, as to interrupt the power to the red buld (which, in the original wiring, is always powered by the pick up...)
When deactivated the NC contact of teh relay will reconnect the track power to the bulb.

Small but importnat detail: since track voltage is about 19V in digital, don't forget to add a couple of diodes between track supply and the red bulb.

I also painted the inside of the driving trailer's nose to avoid teh bright bulbs to shine through the thin plastic.

A nice project in any- case!

Cheers
Jacques Vuye aka Dr.Eisenbahn
Once a vandal, learned to be better and had great success!
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Offline RayF  
#8 Posted : 04 August 2012 23:33:57(UTC)
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RayF

Gibraltar   
Joined: 14/03/2005(UTC)
Posts: 15,870
Location: Gibraltar, Europe
Thanks, Jacques, for a most comprehensive answer!

Now all I need is a 3071! I'm bidding on one at the moment. We'll see if I win it.
Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
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Offline seatrains  
#9 Posted : 05 August 2012 05:17:10(UTC)
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seatrains

United States   
Joined: 22/11/2006(UTC)
Posts: 676
Location: Shoreline, WA
Didn't one of our members convert one a while ago?
http://www.saebonet.com/
See link to 3071 on the right...
Thom
European Train Enthusiast - Pacific Northwest Chapter
4th Division, Pacific Northwest Region, National Model Railroaders Association
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Offline RayF  
#10 Posted : 05 August 2012 11:13:11(UTC)
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RayF

Gibraltar   
Joined: 14/03/2005(UTC)
Posts: 15,870
Location: Gibraltar, Europe
Thanks Thom,

I'd forgotten about Svein's conversion. Now that you've brought it to my attention I remember reading it some time ago.

With Jacques answer and Svein's instructions I now have a pretty good idea what I'm going to do.
Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
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Offline RUBEN SPAIN  
#11 Posted : 05 August 2012 14:19:38(UTC)
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RUBEN SPAIN

Spain   
Joined: 19/12/2011(UTC)
Posts: 112
Location: Madrid Spain
Originally Posted by: RayF Go to Quoted Post
Thanks Ruben,

I hadn't considered using a function decoder for the driving trailer. It saves having to wire throught the coaches.

What about the pick-up shoe switchover? Did you just decide to do without the function?



I put out the analog inverter. So there are two options.

(My decoders have 8 pin connector.)

Soldering wires directly to the wires of the decoder.

Soldering wires to a ESU 51950 8 pin connector. So the 8 pin decoder could be changed when you want.
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Offline ACEuroTrains  
#12 Posted : 29 August 2012 20:24:52(UTC)
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ACEuroTrains

United States   
Joined: 02/01/2012(UTC)
Posts: 5
Originally Posted by: RUBEN SPAIN Go to Quoted Post
Hello.
I have the 3070 (it is the same but with interior lights) with 4070 coach, digitalized.

First you must change motor stator with ESU magnet to convert it to a DC motor that can be controlled by a decoder.

I installed a ESU lokpilot V3.0 in the motor head coach. To prevent flickering on ligths you can install a 1microF capacitor between the front (and another for the rear) light. The capacitor +pole must be connected to mass. To protect the decoder you should also install a 1n4007 diode between the yellow (and another one to white) wire and the connection of the lamps. The catode of diode (the side with a grey stripe) must be connected to the decoder wire because the decoders voltage is negative. And you should limit the lights output of the decoder to a value of 6-9. The capacitor rises the voltage to higher values

For the head coach without motor I installed a function decoder lokpilot V3.0 only for lights. The same with capacitors and diodes to prevent flickering.

Both decoders must have the same address.

It is important you can not have any electrical connection between both head coaches.

If you want interior ligthing in the coaches you can connect one coach lights to the aux1 (green wire) or aux 2 (violet wire) from the main (motor control of head coach) decoder.

The other coach and the dummy head coach lights can be connected to aux 1 and aux 2 of the functions decoder.

You can install LED lights in the coaches (for interior lighting) so you can avoid the connection to mass and the return wire is the one with blue colour.


Regards


Disregard

Edited by user 30 August 2012 07:13:03(UTC)  | Reason: Not specified
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