LGB FRANK S TENDER

scook

scook

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Hi all,

I am trying to fit DCC to a LGB Frank S, when I first had the loco, when ran on analogue the tender ran on its own, now not even the lights work let alone the motor. I have tested the motor and it runs fine, and all pick up are working. When I plug in a lgb decoder, and again run on analogue, the motor begins to run but the decoder smokes. I did switch the small switches across for digital running. I have not tried on DCC yet but was wondering if anyone has an suggestions? I have checked the circuits boards and all joints are soldered correctly.
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The red wires from the pick up pins are for a sound unit
Thanks
Sam
 
scook said:
Hi all,

I When I plug in a lgb decoder, and again run on analogue, the motor begins to run but the decoder smokes.
Thanks
Sam
Click to expand...
Sam there's a good chance that the motor is taking too much current, possibly due to contamination. I suggest you unplug all electronics and feed the motor from a dc controller with an ammeter and reply with the value of current taken.
 
What decoder are you using.
Sounds like you may have a motor pulling high current.
A separate sound unit should come off the motor wires not track.
Are you wanting to run this on digital - why are you putting analogue through it?
 
"Magic Smoke" is not a good sign...especially if it isn't coming from a smoke unit...
 
The picture of the top of the motor block appears to only show three wires to it?? - The fourth could be obscured by the other wiring, of course..

If this is so, then one track-side, and on motor wire are commoned in the 'block. This needs to change for DCC.
 
PhilP said:
The picture of the top of the motor block appears to only show three wires to it?? - The fourth could be obscured by the other wiring, of course..

If this is so, then one track-side, and on motor wire are commoned in the 'block. This needs to change for DCC.
Click to expand...

I think it must be a 4-pin "D" gearbox, Phil, as the circuit board is obviously set up for connection of a decoder via the LGB interface cable.... assuming it's all the original factory installed stuff, of course.....

Question to the OP: Alan (Stockers) asked what decoder you're trying to use, and I've not yet seen an answer to that? Might help with trying to figure out what's wrong.

Jon.
 
Just tested the motor, pulling 1.1 amps on 21v

I have tried another motor in the tender and still no joy

When I first looked at adding a decoder to the tender I only had analogue controls, but the tender won't run on analogue with or without a decoder,I am using a lgb 1 motor decoder and plugging it in using the coloured wires to the tender circuit board,

Thanks for your help
Sam
 
Sounds as though you have blown one of the on board circuit boards if it wont run with or without the decoder.
You will need two of those old decoders but you probably know that. They are rather dated and I wonder where you got it from - secondhand per chance?
If the electrics are blown it will be easiest to strip out the loco and tender and hard wire a new decoder in - you only need one. There are two or three versions on connecting the two units together - the best will share all pickups with both motors..
 
You did change all 4 switches which disconnects the motor from the track power. Otherwise you do get real smoke.
Switches are closed for DC, open for DCC
 
I think your right stockers must be the circuit board, best to fit a massoth xl, I can do it myself so will add it to the project list!!!
Thanks
Sam
 
scook said:
Just tested the motor, pulling 1.1 amps on 21v........
Click to expand...

Irrespective of other problems with the decoder and such, that's quite a high figure for an LGB motor, especially if being tested without too much of a load.... a Buhler motor in good order should pull less than half an amp under test conditions, 0.3-0.5 amps is typical.
Is everything running freely in the tender gearbox?

Jon.
 
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