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 Posted: Thu Aug 3rd, 2017 10:26 pm
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Michael M
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Helmut,

Something like this step-down: http://www.ebay.com/itm/3-5A-DC-DC-Buck-Step-Down-Voltage-Converter-Module-3V-3-3V-3-7V-5V-6V-7-5-9V-12V-/282546770569?var=&hash=item41c9199289:m:mvg3xR_hzTuUeziDsmDBsog


So, the 7.4v Li-Po powers both receiver AND motor?  Now I'm wondering if I can get this all wired up correctly.



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Michael
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 Posted: Fri Aug 4th, 2017 07:16 am
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Si.
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Hi Michael :wave:



It really isn't that complicated to wire the various parts together. :dope:

If I get a moment, I'll see if I can draw a quick schematic of the wiring.


I think the tricky part will be doing 'an intelligent' installation ... L:

... potentially more so with the Shay than the railtruck, due to less space.


The railtruck would be very easy, with it's big covered back. :)

The Shay depends a lot on your cab & bunker up-scaling I guess.


I think some kind of modular strategy, with connectors at appropriate locations is the key. :brill:

Miles of too long, thick & messy wiring, is gonna lead to disaster.


Planning & drawing stuff out before hand, is certainly my answer to any wiring jobs.

It's amazing just how much wiring, these 'wireless' R.C. trains need !! :P



:!:



Si.



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 Posted: Fri Aug 4th, 2017 07:26 am
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Michael M
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I came across this schematic at: https://www.rcgroups.com/forums/showthread.php?1442096-How-to-connect-motor-ESC-battery-and-receiver




Si,

I don't see any step-down like Helmut was talking about.

If this schematic is correct then I think I can handle it.  I just wanted to make sure that I was ordering the correct parts.  I'll measure the shay fuel bunker just to confirm that everything will fit.  In Woodie's Mogollon thread he provided some quick measurements of his shay so I'm pretty sure it will work.  I'll be building a new cab so I'll stick the battery in the roof.  All that has to go into the fuel bunker is the receiver (with case removed), and the esc.



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 Posted: Fri Aug 4th, 2017 08:14 am
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Si.
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Hi Michael :wave:



Just so you know BTW ...

... I've never put R.C. in $4!7 before !! :Crazy:


BUT


I have spent 40 years doing electronics & wiring of many different sorts ...

... PHEW !

( I guess he knows something then )


As far as the 5-Volts Helmut talks about for the receiver.

I believe that the ESC supplies this, through the 3-wire ( Black, White, Red ) cable ...

... plugged into the receivers 'throttle channel'.


Since the E.S.C is OK operating on up to about 8.5-Volts ...

... your 2-cell battery will generate enough power for the receiver, via. the E.S.C.s ...

... B.E.C ( Battery Eliminator Circuit ).


The receiver only needs an independent 5-Volt power-source ...

... IF there is no E.S.C with built in B.E.C used in the install ...

... such as in a sail-boat or glider, where there is no motor used.


In such a case as those, the receiver is powered by 5-Volts ...

... which also operates the R.C. servos used for rudders & wings etc.



:brill:



Si.



Silicone cable is great for wiring BTW.

Lots of very fine/flexible strands in a compact cable.

Plus the insulation doesn't melt back when soldering.

I bought a bit recently, which I believe was 24 A.W.G thickness.

Available from eBay for $1 inc. P&P for a few yards normally.


:bg:




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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Fri Aug 4th, 2017 09:23 am
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Michael M
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Si,

Thanks for 'full disclosure' there.

Looking at the ESC it appears, even though it doesn't clearly state it, that it has a BEC the way it is configured: http://www.ebay.com/itm/162488309545

Black, red, white to the receiver.

Black & red to battery.

Black & red to motor.

It should work just fine, right? 

With the T-boiler shay in front of me it is kinda tight in the fuel bunker.  It's set up to convert to DCC.  If I can yank out that circuit board that would provide much more room. 

Anyone have any tips for removing the cab and fuel bunker?  The basic instructions don't offer much information.




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 Posted: Fri Aug 4th, 2017 02:42 pm
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Helmut
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Somehow I couldn't access the full specs yesterday -yes, there's a 5V/1A BEC built-in. No sweat!



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 Posted: Fri Aug 4th, 2017 07:23 pm
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Michael M
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Helmut,

Thanks for checking on that info.  One less thing to worry about, and one less thing to try to fit into the Shay's water/fuel bunker.

Now I need to disassemble the cab and bunker on Bachmann's On30 T-boiler Shay.  The cab will be replaced with a open-air affair with the Li-Po battery and on/off switch attached to the underneath of a new roof.  The RC receiver and ESC will need to go into the bunker.

How do I remove the cab and bunker?

In the bunker is a circuit board.  Do I need that?  Can I chuck it to make more room?




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 Posted: Fri Aug 4th, 2017 09:09 pm
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W C Greene
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Michael, look at the frame underneath the cab & bunker and with possibly some magnification and moving "details" out of the way you will find some tiny (1MM or so) Phillips head screws that get removed. Then the cab & bunker can be removed. As I usually do, I tossed the circuit board and ground off the metal parts that the board was mounted on. I located the motor wires and marked them, then I got rid of the pickup wires and that opened the bunker up for the "proper" equipment.
Good luck.

Woodie



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 Posted: Sat Aug 5th, 2017 03:48 am
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Michael M
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Woodie,

Thank you!  Thank you!

That's just the info I was looking for.  I'll have to buy you a couple of cerveza over at Woodie's Cantina.

I'm going to forge ahead and order all those RC components.  Railroad management can't wait to get its new shay on home rails.



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 Posted: Sun Aug 6th, 2017 08:07 pm
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Si.
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Hi Michael :wave:



One thing I did wonder about.

I figure your $1 battery charger, like mine, is for 1-cell batteries.

How are you going to charge the 2-cell ?



I have been considering 1-cell Vs. 2-cell for my install.

But haven't really decided anything yet.

For sure the higher Voltage MIGHT be good.

But a DC-DC step-up could be just as good.



Mmm . . .



:brill:



Si.



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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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