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USA Trains SD40-2 LM-4S-G installation

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Gino:
I asked RailPro what to do and here is what they said/suggested:

"We may offer a higher power supply for G scale at some point.

You can parallel (tie + outputs together and to one rail of track and tie - outputs together and to the other rail of track) two PWR-56 to supplies for more power.  Warning: You should never connect any more than the two PWR-56 to a layout if you do this. 

If you are using only LM-4S-G modules you may want to use a USA Trains 10 amp power supply.  We have tested LM-4S-G on USA trains 10A power supply and it works ok with the power supply we tested.  The PWR-56 is 4 amps.  So the 10A power supply has more than twice the power of our PWR-56." 

I am not comfortable tying two PWR-56's together for higher current.

So I have another question. If a USA Trains 10 amp power supply has been tested and works with the LM-4S-G why not use a suitable fixed DC Power Supply to do the same job?

My understanding is that the LM-3S-G has a maximum input voltage of 24V (28V for the LM-4S-G) per the spec sheet. From what I have read the USA Trains 10 A Power Supply has an output voltage of 20V.

Why not use a 20V 10A power supply to power the rails.
I have both LM-3S-G and LM-4S-G modules.

Gino

William Brillinger:
"Why not use a 20V 10A power supply to power the rails."

There is no reason not to do this as long as you are not using any of the smaller HO decoders.

Gino:
This is strictly a G Scale application.

Gino

gregeusa:
According to the web site, a PWR-56 with the PA-2 power adapter is 14.2 volts, 4 amps.

Clearly it is a regulated supply.

Combining 2 in series would give you 28.4 volts at 4 amps.

According to the site, this voltage exceeds the maximum voltage of the decoder by 0.4 volts, but elsewhere the maximum voltage is listed as 30 volts. So, since they are regulated supplies, two PWR-56 (supplied by two PA-2)  should be fine for G scale up to 4 amps.

But now you have 2 repeaters close together, and there's no system architecture document about this.

Seems better to have your PWR-56 in the best "radio" / "repeater" location and use a different power supply to the rails.

But 20 volts might be a bit low for some G scale... I tested a 3 axle Aristo passenger diesel, and it only went 62 smph on 20v DCC, went 92-94 on 23.9v DCC...

So I would strive to get 24v on the rails for your G scale stuff, of course as Bill says, other RailPro decoders will not tolerate the higher voltages.

Greg

zr1rob:
I have several Aristo SD45s running 4S (14.8V) batteries and LM-3S-G modules, and they run fine, but maxed at roughly 45mph. I also run an Accucraft GS4, and it has a 6S (22.2V) battery, but it doesnt do much better scale speed wise. It might depend on the motors in the model.

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