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Good Morning,

I saw this question posted elsewhere on the web days ago and haven't seen a response. Could anyone here comment? I'm interested in the big picture of why the connections would need to be reworked at all. Thanks for your time.

Jim K



I have an issue with a 2126 whistling freight shed that was working fine with an old 4090 transformer, but doesn't like the KW I just purchased and hooked up.  I have the shed set up to operate on an insulated track section; when using the 4090, I had the terminal clip at the back under the shed's roof wired to the number 2 clip on the lockon (with nothing on the number 1 clip) and the front clip under the roof going to the "C" post on the 4090.  It worked find under that arrangement.  With the KW, however, the "C" post does not provide enough voltage to operate the shed, and the "D" post provides 20 volts, which is too much.  I've also tried hooking the shed up to the "A" and "B" terminals on the KW, but that doesn't work right either.  The track wiring is exactly the same as I had it before when it was working with the 4090.  Any suggestions for how I might get this to work with the KW? 

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That is your only fixed voltage choice with a KW - 6 v or 20v - if you are running trains with A-U & B-U.

If the 4090 was connected to the rest of the layout using "U" to the center rail and the common "A" to outside rails, the the 4090 was providing 16v to the whistle. If you run trains with the KW only on A-U, then you can connect the whistle to "B" and set it at 16 volts(or whatever level you wish for satisfactory operation) to duplicate the 4090 setup.

@ADCX Rob posted:

That is your only fixed voltage choice with a KW - 6 v or 20v - if you are running trains with A-U & B-U.

If the 4090 was connected to the rest of the layout using "U" to the center rail and the common "A" to outside rails, the the 4090 was providing 16v to the whistle. If you run trains with the KW only on A-U, then you can connect the whistle to "B" and set it at 16 volts(or whatever level you wish for satisfactory operation) to duplicate the 4090 setup.

Like Rob said. Or leave the 4090 hooked up to run the shed only. Or get a Z-4000! The KW is a pretty good transformer but the accessory post voltages were poorly laid out. No idea why Lionel did the KW this way.

Rod

One possibility, might not be worth the effort, would be to put a step down transformer to drop it from 20v to 16v on the fixed output.  I may be wrong (son of an EE, black sheep) if you put the ground on 6v and the hot path on the 20v fixed, wouldn't that give you 14v relative (and please don't try this unless someone else said it was okay), since ground and hot are relative voltages?

@bigkid posted:

One possibility, might not be worth the effort, would be to put a step down transformer to drop it from 20v to 16v on the fixed output.  I may be wrong (son of an EE, black sheep) if you put the ground on 6v and the hot path on the 20v fixed, wouldn't that give you 14v relative (and please don't try this unless someone else said it was okay), since ground and hot are relative voltages?

Only problem with this idea is that 022 switches (and most others) are grounded to the track, so the same as the U post return from track power. So if you hook the 6V post to the same ground you are essentially shorting out the 6V output, which will cause overheating, followed by smoke, and other unpleasantness!

Rod

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