Help with LGB mallett- conversion to DCC

  • Thread starter Roger the Dodger
  • Start date
R

Roger the Dodger

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3 Jul 2019
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Bournemouth UK
Sorry to be a pest but I've sort of hit a brick wall. Fitted the Massoth XL decoder and Hardwired both motors to it. Programming using my Digitrax system it runs absolutely fine.
So I hardwire the front lights to the LV and + terminals on the decoder. Program a value of 5 in CV 50. Nothing at all when I press F0 with the loco in FWD.
I've increased the value in CV50 as far as10 - makes no difference.
I've checked the bulbs are all OK by detaching from the decoder and trying them with a 5 volt supply - all OK

Am I doing something wrong here?
 
Ralphmp

Ralphmp

Registered
6 Jan 2010
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Herts
Can you read the value in CV 51. Default for the XL is, as I recall, 128 - this represents Lights on with F0, Directional light switching (i.e. front lights only come on when loco moves forwards)
 
dunnyrail

dunnyrail

DOGS, Garden Railways, Steam Trains, Jive Dancing,
25 Oct 2009
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St.Neots Cambridgeshire UK
Thanks everybody, you've all been very helpful. Wonderful video Dunnyrail!
Thanks Roger, pity you are so far away but if you are ever in Cambs always welcome to visit. That vid is probably 3 or more Years old now and I keep on thinking about updating it as inevitable things have changed somewhat.
 
R

Roger the Dodger

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3 Jul 2019
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Bournemouth UK
Success. Ralph was correct, for some reason the value in CV51 was not showing 128 but in addition the decoder was set for 14 speed steps whereas my Digitrax system was set at 128 speed steps. When edited to 14 everything works as it should. Thanks once again.
 
Ralphmp

Ralphmp

Registered
6 Jan 2010
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16
Herts
HTH. Enjoy your loco!
 
dunnyrail

dunnyrail

DOGS, Garden Railways, Steam Trains, Jive Dancing,
25 Oct 2009
14,840
355
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St.Neots Cambridgeshire UK
Success. Ralph was correct, for some reason the value in CV51 was not showing 128 but in addition the decoder was set for 14 speed steps whereas my Digitrax system was set at 128 speed steps. When edited to 14 everything works as it should. Thanks once again.
That speed step thing is always one to catch you out. I Remember when Operating on the Ruschbahn my Lights would flash and do all sorts of silly things including not being on. Always somehow the Massoth Handset for the Loco in question had defaulted to anything other than 128 Speed Steps .... grrrr.
 
LGB333

LGB333

Active Member
Roger - I concur with the advice you've gotten for your DCC conversion. 1. Use the Massoth XL; if you also want sound, use an XLS or the XL with a Phoenix Sound decoder (I consider the Phoenix Sound decoders as the "gold standard" for large scale - just my opinion); totally remove the LGB factory circuit boards - powering your new DCC conversion for any purpose makes the old circuit board a potential failure point in the future, which you will then have to remove and rewire anyway; the LGB on/off switch isn't used anymore although I sometimes modify it to be a total power on/off to a locomotive, especially if someone plans to primarily run DCC, but occasionally run in DC mode, the loco can be parked on the layout.

Ironically, I'm in the midst of doing a DCC conversion on a customer's DC/Analog LGB 20851 loco which a previous owner installed a Phoenix Model 97 Sound Decoder (DC or DCC power). The conversion of the three pin to a 4 pin motor blocks was very easy since the connections are already available.......just required isolating the existing pins and soldering a fourth wire on one of the top metal connectors. You can see in the photo that I've removed the original LGB circuit board replaced with an Massoth XL Driving Decoder for two motors. I'm also installing a Massoth DCC Pulsed Smoke Generator. This old 2005 vintage Phoenix Model 97 Sound Decoder is still "chugging" along but only has two sounds that will be activated by my customer's new Piko Central Station/Navigator/Wireless Receiver.......the whistle and bell. I'm also leaving the previously installed reed switches connected to the sound decoder in case the owner wants to continue using magnets on some areas of his garden railway track. Note the screw connectors are only temporary since I have to reopen the rear motor block to install new idler gears that are mostly stripped........replacement parts are on order. I'm going to use the rear lights/engineer cab light cable, just cut off the connector and solder wires to then run to the XL.
127662_fcd32a90702b6db1e6b09cfc2719acf5.png
 
Last edited:
R

Roger the Dodger

Registered
3 Jul 2019
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66
Bournemouth UK
Thank you everyone. First LGB loco converted to DCC.
So this might be a whole different ball game. I have now got to do an LGB 22430 electric loco, with operating pantograph - GULP!
The loco is again, quite old, 1989 stamped on the motor bogies, so two 3 wire gearboxes, li ghost and cab lights which should be ok. The pantograph S are a different story. I don't necessarily want to be able to operate these on a function button, I'd be quite happy if they operated as they do now, apparently, when the direction is changed but the electronics in there looks pretty fearsome.
I've searched the web to see if there is a guide of any type but no luck, so anyone on here done one of these or know someone who has and can give me some advice?
 
D

Dan

Registered
28 Jan 2010
218
6
Eastern MA
LGB runs the 5 volt bulbs at 6 volts. Remember that the bulb does see the full pulse voltage for a short time and I find on my 24 volt system I had to use values of 4 or 5 to get bulbs at a good brightness.
My system does place 24 volts on the track (input to command station is 30 volts). Most 24 volt systems have a 24 volt supply and the station drops approx 2 volts to the track whether AC or DC controlled.
Only exception I know is the LGB hut which ties the input supply to the output at full speed.
 
dunnyrail

dunnyrail

DOGS, Garden Railways, Steam Trains, Jive Dancing,
25 Oct 2009
14,840
355
71
St.Neots Cambridgeshire UK
Thank you everyone. First LGB loco converted to DCC.
So this might be a whole different ball game. I have now got to do an LGB 22430 electric loco, with operating pantograph - GULP!
The loco is again, quite old, 1989 stamped on the motor bogies, so two 3 wire gearboxes, li ghost and cab lights which should be ok. The pantograph S are a different story. I don't necessarily want to be able to operate these on a function button, I'd be quite happy if they operated as they do now, apparently, when the direction is changed but the electronics in there looks pretty fearsome.
I've searched the web to see if there is a guide of any type but no luck, so anyone on here done one of these or know someone who has and can give me some advice?
I think you will find that a Massoth Chip would be able to do the Pan OK. Probably a Servo is used and Massoth Chips can certainly handle them, just do not ask me how!