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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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 Posted: Sat Oct 31, 2009 5:50 pm Post subject: Battery Contactor Coil Wiring |
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Hi!
I've got a Tyco EV200 battery contactor. In addition to the two high current posts, it has two small wires labelled coil positive and coil negative. The Z diagrams show just one wire between the switch and battery contactor. In my case, seems like this would be the coil positive. So where would the coil negative wire be connected?
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Dan |
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dsvs(at)ca.rr.com
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| Posted: Sat Oct 31, 2009 6:08 pm Post subject: Battery Contactor Coil Wiring |
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It probably drives a light to tell you that the contactor is closed. This
can be helpful to prevent starter damage.
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bob(at)bob-white.com
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| Posted: Sat Oct 31, 2009 6:26 pm Post subject: Battery Contactor Coil Wiring |
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Hi Dan,
Take a look at how the switch is wired. Most likely it connects the
wire to the contactor to ground. In this case, the red wire can be
connected directly to the large terminal that goes to the battery.
Connect the black wire to the lead to the switch. You don't need the
diode when using the EV200.
If the switch connects the wire on the contactor to a bus (12V), then
the black wire would be connected to ground.
Bob W.
On Sat, 31 Oct 2009 18:50:19 -0700
"messydeer" <messydeer(at)yahoo.com> wrote:
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N93BD - Rotary Powered BD-4 - http://www.bob-white.com
Now Rotary Powered Alpine
http://www.youtube.com/watch?v=FwceNc2ydN8
Cables for your rotary installation - http://roblinstores.com/
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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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| Posted: Sat Oct 31, 2009 6:31 pm Post subject: Re: Battery Contactor Coil Wiring |
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Thanks, but this is a battery contactor. Seems like what you're saying might work for starter contactor, or am I missing something?
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dsvs(at)ca.rr.com
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| Posted: Sat Oct 31, 2009 7:09 pm Post subject: Battery Contactor Coil Wiring |
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You are not missing anything, I mis read the post. Sorry
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Sun Nov 01, 2009 4:43 am Post subject: Re: Battery Contactor Coil Wiring |
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Hi Dan,
Connect the positive coil wire to the big terminal on the EV200 that goes to the battery.
Connect the negative coil wire to the master switch. When turned on, the master switch will connect the negative coil wire to ground.
Joe
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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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Bob McC
Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON
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| Posted: Sun Nov 01, 2009 8:56 am Post subject: Battery Contactor Coil Wiring |
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Dan;
No not all relays or contactors are wired like this. They are all wired,
however, to serve whatever applications they are designed for. If you
purchase a contactor intended for aircraft master relay use then chances are
it will be wired with the internal jumper.
The EV200 you're referring to is not a battery contactor per se but a
generic device used in tens of thousands of different applications and wired
in many different ways. Use as an aircraft master relay is an
infinitesimally small percentage of their total sales and therefore the
design will not take that into account because it would limit some of the
other applications for which it is used. You have to understand how to wire
a device such as this (or any other) for the way your application uses it,
which is what others have explained. Positive to battery, negative through
switch to ground. The rationale is explained in "the book".
Following this list, asking questions, and reading "the book" will soon
result in a good understanding of the not so mysterious mysteries behind the
functioning of many things electrical. There are other ways of wiring this
relay to function in your application by the way, but the "standard accepted
aircraft practice" is as described by the three responses you refer to.
Good luck on the road to understanding. This is a great place to learn. P.S.
don't forget to support Matt's efforts via his annual fundraiser.
Bob McC
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Bob McC
Falco #908
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