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I have a KW that I only use for lights/switch machines and relays.  Originally I was using my Z4000 14 volt accessory output, but as I added more items the breaker would always trip.  Took me a while to figure out the breaker was only rated for 4 ams.  With no load the KW outputs measures what it is supposed to.  What I have on the KW is 19 Lionel dwarf signals, all LEDs.  Each signal also has a DZ 1008 relay.  I have 33 dz2500 switch machines and the majority of them also have the push button controller.  I have 3 Lionel double overhead signals, with 6 more dz1008 relays.  I probably also have about 40 regular lights, street lamps, towers and the like.  I do have a 10 fast blow fuse, it has never blown, but the measured output on each fixed output is 4 volts less than what it is with no load.  To get 14 volts i have to use the B-U  outputs and take the handle all the way up.  

Is what is listed above enough to reduce the power that much.  Since most of the above are LEDs I thought I was fine.  No idea if the relays take must juice just sitting there.

I stumbled on to the issue when some of my relays stopped working.  I thought they crapped out, but they were not getting enough juice to work.  At that time I had all the above on the 14 volt fixed outputs, but it was only delivering about 10 volts.  That is when I moved the above to the B-U outputs.

For my train power i use a ZWL, Z4000 and a postwar ZW, no problem with these, but I don’t have any openings to run the items at 14 volts.

My thought was to move up to a Z, I can then have four multiple outputs that I  could adjust to fine tune of my operating accessories that I did not mention above.  I currently use the B and C posts on the ZWL for 12 volts and 15 volts, for the majority of all my operation accessories.

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@Tony H posted:

Is what is listed above enough to reduce the power that much.

It's possible. Try to tie the 2 "U" posts together outside the case(they are connected internally) and make sure your common returns are sized for the total output of the KW... make it 15 amps to be safe. To get an empirical figure on how much of a load is on the KW will require you to check it with an ammeter.

Rob, i will give that a try.

All my wiring from the transformers are 14 gauge.  

I thought i might split out the switch machines, dwarf signals and relays and put them on the Z4000.  Originally that is what I had and everything worked, I only started to have the problems when i added all the lights.  I  can put the lights on the KW and see what happens.  All I would have to do is run another 14 gauge wire around/under my layout and change the connections for all the lights.

@Tony H posted:

Rob, I don't have an ammeter, but I do have a multimeter.  Looking online, it looks like I should be able to use the multimeter.  Would you agree?

No, you need an ammeter capable of a 20 amp load to test how much you are drawing from the KW, two ammeters if you are using the C-D posts as well.

@Tony H posted:

Rob, one other question, If I wanted to use the 14 fixed voltage and the 20 fixed voltage on the KW, could that be done by sharing the D post between the two?  These would only be used for accessories or lights.

I would not be using A-U or B-U.

Tony

Yes, as long as the C-D 14 volts accessories are isolated and not connecting to or referencing "U" through track connected/common ground accessories as C has a 6 volt potential to U.

Last edited by ADCX Rob
@ADCX Rob posted:

Yes, as long as the C-D 14 volts accessories are isolated and not connecting to or referencing "U" through track connected/common ground accessories as C has a 6 volt potential to U.

Thanks, currently I am using A-U to supply the 14 volts and I have the tied the U post together with my other transformers.  If I use C-D for 14 volts and D-U for 20 volts, I would then no no longer tie this transformer common ground with the others.  It would just be stand alone, correct?  I would go through everything connected to the KW to make sure nothing is connected to a common ground.

@Tony H posted:

Thanks, currently I am using A-U to supply the 14 volts and I have the tied the U post together with my other transformers.  If I use C-D for 14 volts and D-U for 20 volts, I would then no no longer tie this transformer common ground with the others.  It would just be stand alone, correct?  I would go through everything connected to the KW to make sure nothing is connected to a common ground.

Why complicate things?  Just use A-U like you are and keep the commons common. I had no idea you were going to abandon A-U to switch to a non-common set of binding posts. The KW is a great accessory transformer if you are not also running trains with it as it has 2 variable & 3 fixed ranges to work with.

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