RailPro > RailPro Specific Help & Discussion
Keep Alive installation w/ Railpro
Alan:
--- Quote ---What about using this up converted higher voltage with the AR's and other Ring Engineering components?
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The only potential issue with a DC up converter, or any buck converter for that matter, is ripple current resulting from the internal inductor design. Here is an article explaining: https://www.digikey.com/en/articles/techzone/2015/apr/the-advantages-and-drawbacks-of-dc-to-dc-voltage-converters-with-integrated-inductors
An LM has awesome ripple rejection as evidenced by its ability to run on a DCC layout. A DCC signal is the very definition of a highly rippled supply line. The LM functioning proves Ring incorporates sufficient supply rail smoothing in the LM circuit. No reason to think they wouldn't do the same in the other components. I don't think you have anything to worry about with the up converter other than it will waste a little more electricity as heat.
$18 bucks for a fully conditioned power supply is still the better way to go however.
Alan:
--- Quote ---What is the net effect of lower voltage at the motor? Poor performance or just a lower top speed?
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Lower top speed for sure but that is rarely a problem. Models run too fast anyway unless you have a gigantic layout. I'm with Bill, I have my locos dialed way back so their top speed is more correct for the curve radii of my layout. They don't move fast but what's your hurry? The end of the layout is less than 100 track feet away! :P
The performance issue is something Kevin may be able to shed light upon with his battery deal. The LM uses PWM. So, even at speed step 0.1% there is still full track voltage delivered to the motor however briefly. The beauty of PWM is the ability to turn a motor very slowly because the full voltage burst overcomes internal friction and loading on the motor. Something low voltage can't do. With reduced voltage the ability to nudge a motor is also reduced. This begs the question: Is there a slow speed operational difference of a loco between 14.8V and say 12V? The math says there must be. Curious what the eye says.
I spent way too much time and money making my power system work like tits-on-ritz so I will not be able to definitively answer this question. I can say LM equipped locos creep along very well at 14.8V.
William Brillinger:
--- Quote ---$18 bucks for a fully conditioned power supply is still the better way to go however.
--- End quote ---
Same question: Are there going to be any issues using AR's etc with these?
Alan:
Absolutely not.
RP is selling the same thing just in different packaging.
TwinStar:
--- Quote from: Alan on February 15, 2017, 02:31:18 PM ---
--- Quote ---What is the net effect of lower voltage at the motor? Poor performance or just a lower top speed?
--- End quote ---
Lower top speed for sure but that is rarely a problem. Models run too fast anyway unless you have a gigantic layout. I'm with Bill, I have my locos dialed way back so their top speed is more correct for the curve radii of my layout. They don't move fast but what's your hurry? The end of the layout is less than 100 track feet away! :P
--- End quote ---
I model the Twin Star Rocket. She would hit the top of the siding at 100mph and still make the platform for her station stop! I like to be prototypical. ;D ;D
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