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prestonkavanagh
Joined: 27 Nov 2018
Posts: 16
Location: Tarpon Springs
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 Posted: Mon Jan 18, 2021 12:57 pm Post subject: Wiring of the S704 in Z101 |
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Over the weekend I figured out a detail of the Z101 diagram - how to wire the S704 relay. See attached.
In the Z101 detail Bob mirrors the expected flow through a relay. Normally power comes in the COM and goes out through either the NC or (when the coil is activated) the NO. Here power is sitting in the NO ready to flow to the device through the COM. It's elegant and creative. Or at least I found it so.
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Wiring of the S704-1 relay.docx |
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PA-12, BD-4, RV6a, gliders, Rutan canards |
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johnbright
Joined: 14 Dec 2011
Posts: 166
Location: Newport News, VA
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| Posted: Tue Jan 19, 2021 9:39 am Post subject: Re: Wiring of the S704 in Z101 |
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It doesn't matter whether current flows from or to the common terminal of a relay.
In Z101 the common terminal has to go to the CD/aux/brownout bus because the bus is powered by the battery thru the NO terminal and by the optional brownout booster thru the NC terminal.
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John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jan 19, 2021 9:59 am Post subject: Wiring of the S704 in Z101 |
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At 02:57 PM 1/18/2021, you wrote:
| Quote: | --> AeroElectric-List message posted by: "prestonkavanagh" <preston.kavanagh(at)gmail.com>
Over the weekend I figured out a detail of the Z101 diagram - how to wire the S704 relay. See attached.
In the Z101 detail Bob mirrors the expected flow through a relay. Normally power comes in the COM and goes out through either the NC or (when the coil is activated) the NO. Here power is sitting in the NO ready to flow to the device through the COM. It's elegant and creative. Or at least I found it so. |
That's one way to use it.
The S704 relay is just a single pole, double
throw switch. The only difference is that it
is operated REMOTELY by energizing a magnetic
motor.
There is nothing 'magic' about which way
power flows through the operating 'switch' . . .
One could have two power inputs NO and NC
terminals with power out on COM. You'll
find all variations on the theme in the PPS
drawing on the website.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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