LGB 21812

chasaitch

chasaitch

chasaitch
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I am not chuffed as my Hertz 2-10-2 doesn't chuff enough although CV 54 reads at 72. (bit4 load chuffs 8, bit7 4 chuffs 64).but I am only getting 2 chuffs. If I program CV 54 as 8, ie 2 chuffs per revolution I only get 1 chuff! I had a pulsed smoke generator fitted and kept the LGB sound decoder and at 2 chuffs or do I mean 4 everything is hunky dorry apart for the fact it is only 2 chuffs. Is there a CV that can be altered to correct the fault? I have thought of replacing the LGB sound decoder with a Massoth 8216100 which should provide 8 more functions but can not find a youtube clip showing how to take the Loco apart without reverting to a hacksaw!
 
Was it OK before the smoke unit was fitted?
 
By default LGB sound is two chuffs per revolution..
This is 'wrong', but at our scale 4 beats per revolution is so fast (IMHO) it does not seem 'real' to me.

Are there other CV's on the LGB unit to do with chuff duration and spacing? - Not au-fait with that particular unit.

Is 'chuff' synchronised to an axle sensor?

Does the smoke unit 'puff' in sync. with the sound?
 
To first question; Yes it was OK before pulse unit installed.
I fully agree that 4 chuffs made it sound like a Castle at full chat but then you tended to be going way over scale speed, but I have LGB 26813 997238-1 with sound that at 4 chuffs sounds good.
I have not been able to find any other CVs in the manual that has any baring on the issue but the smoke unit does puff in sync with the sound almost better than 7238-1.
 
What the manual says:-
CV54
LGB configuration
[2]
Bit programming
Bit 1: hand-off function, 0 = off, 1 = on [0]
Bit 2: MTS Back-EMF, 0 = off, 2 = on [2]
Bit 3: analog Back-EMF, 0 = off, 4 = on [0]
Bit 4: load-dependent chuffs, 0 = off, 8 = on [0]
Bit 5: 0 = F1 constant, 16 = F1 flashing [0]
Bit 6: 0 = F2 constant, 32 = F2 flashing [0]
Bit 7: 0 = two chuffs/revolution, 64 = four chuffs [0]
Bit 8: automatic brake sounds, 0 = on, 128 = off [0]
To program, add the values for the individual Bits and
program the resulting function value. The values for
Bits 5-8 vary between locos. The values for your loco
can be read using the 55045 MTS PC Decoder Programming
Module.
Hand-off function on: When operating with 55015, you can
adjust direction and speed for two seconds after selecting a
moving loco without causing the loco to stop
 
chasaitch said:
Yes it was OK before pulse unit installed.
Click to expand...

So take it back to them!

or - did they fit a wheel sensor or did the original sound unit have one?
 
Mine is fine with a cv54 value of 64 so try just that in its own first then switch on the load sound again by making it 72, if it reverts to 2 chuffs try 74 value.
Personally I prefer 4 chuffs but don't like their on or off load dependant setting. The loksound does it much better with gradual transitions.
 
PaulRhB said:
Mine is fine with a cv54 value of 64 so try just that in its own first then switch on the load sound again by making it 72, if it reverts to 2 chuffs try 74 value.
Personally I prefer 4 chuffs but don't like their on or off load dependant setting. The loksound does it much better with gradual transitions.
Click to expand...
I tried the CV54 route but no joy. I did manage to take the loco apart without resourse to a hacksaw to find the smoke unit set up in boiler housing immediately under the chimney so I can't get to the dip switch but I understand this can be overwriten on CV 50 although the factory setting is set at 5. If the dip has been set at 2 revs then this could be the sourse of my problem; has anyone got words of wisdom/caution before I wade in.
 
The Massoth pulsed smoke unit has a decoder built in, so you are changing values in that.
The 'gotcha' is that you have to isolate any other decoder in the loco, so you do not inadvertently change something you do not intend to.

CV 50 will indeed override the DIP switch settings.
 
PaulRhB said:
No sorry but I'd be interested in a step by step of the best way in as I keep meaning to change over to an ESU decoder :)
Click to expand...
First put a new blade in your hacksaw!
Remove the front pony truck (for convenience)
2 srews behind smoke box door holding tube plate, volume control nob remains inside.
Remove the front light beem. 2 screws below the l & r steps and 3rd up into smoke box on the midline at front end of chassis frames
2 screws either side of chassis frames one immediately rearward of cylinders and other by center driver and a 5th screw under boiler ring release boiler tube and side tanks.
2 screws either side of chassis frames one immediately below where cab adjoins boiler tube situated in running plate and other under coal bunker releases cab.
you should then have unfettered access to the electronics.
I don't know if you can release the boiler tube without the cab and reassembling can be a bit fiddly in order to get it to fit snugly, but I have managed to get done what I wanted done!
 
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