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Offline Moritz-BR365  
#1 Posted : 30 January 2017 07:50:34(UTC)
Moritz-BR365

Germany   
Joined: 02/04/2013(UTC)
Posts: 682
Hello,
I purchased a Märklin snow plow 49963, the red-brown one with sound and snow plow function.

UserPostedImage

However, it is well known, that the motor runs very fast and very loud. Furthermore, the motor starts immediatly together with the sound with full speed. But I found an description, how to modify the decoder and the circuit to control the snow plow speed with the drive function of the digital controller.

Here i got the description from Hans-Günter Heiserholt:
http://www.web-hgh.de/p02_ma_26830_u.htm

And here are some pictures of my conversion and a demo video:

Video with comparison before/after conversion:




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Regards,
Moritz

Edited by user 31 January 2017 08:46:05(UTC)  | Reason: Not specified

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Offline Moritz-BR365  
#2 Posted : 30 January 2017 17:41:10(UTC)
Moritz-BR365

Germany   
Joined: 02/04/2013(UTC)
Posts: 682
Here are some more pictures:

The small circuit board for the motor control is placed safely under the decoder board and behind the speaker:

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The small cermet potentiometer enable to adjust the start/brake delay and the maximum speed:

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Side view:

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Offline xxup  
#3 Posted : 31 January 2017 05:01:47(UTC)
xxup

Australia   
Joined: 15/03/2003(UTC)
Posts: 9,231
Location: Australia
I have one of these snowplows, but the technical German on that website is beyond me.. That said, it is still an awesome project.
Adrian
UserPostedImage
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Offline Moritz-BR365  
#4 Posted : 31 January 2017 07:56:19(UTC)
Moritz-BR365

Germany   
Joined: 02/04/2013(UTC)
Posts: 682
Originally Posted by: xxup Go to Quoted Post
I have one of these snowplows, but the technical German on that website is beyond me.. That said, it is still an awesome project.


Hello Adrian,
I may give You some more explanations, if You are interested to do the conversion:

1st You need some additional parts:
1 SMD Trim-pot 10 kOhm
1 SMD Trim-pot 500 kOhm
3 SMD Resistor 10 kOhm
1 SMD Elektrolytkondensator 10 µF /16V

With these parts, You have to build the following circuit:

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I used a small perfboard with 4x6 solder points, the following picture shows a similar version with a stripboard:

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Pictures with friendly permission by Hans-Günter Heiserholt

2nd You have to unsolder Pin 3 and Pin 4 of the 701.22 Decoder chip.
This may be the most risky action. Hans-Günter recommended to use a needle / pin. Put the needle under the Pin 3 from the side, then heat the Pin 3 with the soldering iron and lift the pin from the board carefully! Then do the same for Pin 4.

Take care that the Pin 3 and Pin 4 will not brake off. We need them!

3rd Connect thin litz wire to the Pins [2, 3, 4, 9, 19, 28]
The litz wire should be at least 10 cm. It is helpful to use 6 different-coloured litz wire. The Pins 2, 9, 19 and 28 must not be unsoldered like Pin 3 and Pin4. You can solder the litz wire directly to the Decoder Pins.

Be carefull, dont use too much solder to avoid shortcuts between the Decoder Pins.

4th Unsolder the motor wires
The litz wire to the motor can be unsoldered from the decoder board. All other wires remain where they are.

5th Solder the new litz wires
Solder the 6 litz wires from the decoder chip and the 2 wires from the motor to the new circuit board and place the circuit board as shown in my example. Take care that there is no contact from the circuit board to the case!

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  • The small cermet potentiometer enable to adjust the start/brake delay and the maximum speed.
  • F1 does start sound and smoke unit, but not the motion!
  • The snow pow wheel will be controlled with the rotary button of Your MS2/CS2/CS3, not with a function button!
  • The same for the rotational direction, it is changed with the rotary button, too.


Regards,
Moritz

Edited by user 01 February 2017 08:26:02(UTC)  | Reason: Not specified

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Offline xxup  
#5 Posted : 31 January 2017 09:40:36(UTC)
xxup

Australia   
Joined: 15/03/2003(UTC)
Posts: 9,231
Location: Australia
Hello Mortiz

Oh now that you have written this for me, it makes much more sense and the project now seems to be within my reach..

Added to the project list.. Pin 3 an 4 seems to be the most dangerous part. So at this point it looks like we are isolating the IC pins 3 and 4 from the original circuit and redirecting the signals of those pins to the new board..

Looks doable.. A project for the Easter Break I think.

Thank you for the clear instructions.

Adrian
UserPostedImage
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Offline Moritz-BR365  
#6 Posted : 31 January 2017 11:44:44(UTC)
Moritz-BR365

Germany   
Joined: 02/04/2013(UTC)
Posts: 682
Some additional views of the snow plow:

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Offline Torstein  
#7 Posted : 31 January 2017 14:46:03(UTC)
Torstein

Norway   
Joined: 27/03/2010(UTC)
Posts: 338
Location: Norway
Hi Moritz, nice project you have done with the rotary snow plow.

I think your new functions come to place when the plow are standing still/start up procedure and not moving on the track ??

I am not an expert but information's tells me that the rotary plow run in full speed so the snow do not get packet in the rotary casing.

It is a awesome project, as your other projects.ThumpUp

Anyway this plow do a nice impression on any layout, original or not. Here is mine ØBB version start from 4,37.



Have fun.BigGrin
Torstein
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Offline Moritz-BR365  
#8 Posted : 31 January 2017 15:24:58(UTC)
Moritz-BR365

Germany   
Joined: 02/04/2013(UTC)
Posts: 682
Hello Torstein,
a great video You showed us!

Yes, I think the bucket wheel looks much better, when it starts slowly and also runs out slowly and not as abrupt as it does in the standard configuration from Märklin. And furthermore, the motor makes less noise, when You choose a slower speed. It is still fast enough.

Look here:


The rotational speed is not really so high, otherwise the tangential velocity on the wheel ends would be much too high.

As You can read here (http://www.dampflokmuseum.de/fileadmin/content/default/Museum/Exponate/Sonstige/730-033-DRE/schneeschleuder.pdf), the maximum rotational speed was limited to 160U/min!
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Offline franciscohg  
#9 Posted : 01 February 2017 01:51:49(UTC)
franciscohg

Chile   
Joined: 10/07/2002(UTC)
Posts: 3,126
Location: Patagonia
Thanks so much for posting your project and giving us english instructions!!!!!
Also added to project list
Regards
UserPostedImage German trains era I-II and selected III, era depends on the mood, mostly Maerklin but i can be heretic if needed XD, heresy is no longer an issue.. LOL
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