Subject:
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Re: Railroad Dilemma
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 25 Feb 1999 17:54:10 GMT
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Viewed:
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1936 times
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> > 4) Lastly, what would happen if I had both controllers running at the
> > same time with the switch connecting them is active (both would be
> > connected.)
>
> ben>> You have essentially connect both loops in parallel with two parallel
> power supplies. If the two controllers have opposite polarity you have a
> problem, which will cause a fault and stop the motor and possibly damage the
> motor if the situation lingers.
I suspect the short would happen even if the two controllers have the
same polarity, but are set to different speeds. I'm guessing it's the voltage
they put out which increases as you up the speed. If that's the case and
you have the controllers set to different speeds then you're still directly
connecting terminals which will be at different voltages -
effectively creating a short.
> If both controllers have the same polarity,
> both trains will run with an amount of voltage from summing the addative • powers
> of the two power supplies. Note: since they are in parallel it is not a • simple
> 1+2=3 scenario. The formula escapes me but is a little more complicated.
It's quite a bit more complicated. You're right in that you can't just add
the voltages. My guess is that if an effective short occurs because of what
I just said above, then the voltage the trains will see will be the smaller
of the two voltages being applied by the controller (the bit that's left
after the difference has shorted). But then how much current the trains
can draw from that will be different from what they could draw from just
one controller at that voltage, because you're having to combine the
internal resistances of the controllers - which are in parallel.
Simon
http://www.SimonRobinson.com
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Message has 1 Reply:
 | | Electrical Things (was: Railroad Dilemma)
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| I finally got round to having a play with my controllers and my multimeter. PUTTING TWO CONTROLLERS ON THE SAME TRACK ---...--- Firstly, apologies to Ben, who suggested if you connect two controllers to the same track, then they'd short only if the (...) (25 years ago, 8-Mar-99, to lugnet.trains)
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Message is in Reply To:
| | Re: Railroad Dilemma
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| All, see my comments below prefixed with 'ben>>' (...) ben>> Lego trains seem pretty blow up proof, but I'll keep trying. If I find a way to blow them up using only Lego pieces, I'll let you know. (...) ben>> Yes. Simply be careful not to cause a (...) (25 years ago, 25-Feb-99, to lugnet.trains)
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