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3 way switches

 
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crush



Joined: 28 Dec 2010
Posts: 709
Location: Telemark, Norway


PostLink    Posted: Wed Jan 19, 2011 1:31 am    Post subject: 3 way switches Reply with quote


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The 3 way selector/switch - it comes with two NO contact blocks, doesn't it? Is it possible to add a contact block for the middle (OFF) position as well? Or is the middle position only empty, selecting neither of the contact blocks?

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kal
Forum Administrator


Joined: 12 Dec 2010
Posts: 10136
Location: Ottawa, Canada

Drinking: German Lager, Electric Hop Candy Jr, Scottish 70/-, Cali Common, Maibock, Helles, Russian Imperial Stout, Black Butte Porter

Working on: Weizen


PostLink    Posted: Wed Jan 19, 2011 2:11 am    Post subject: Re: 3 way switches Reply with quote

crush wrote:
The 3 way selector/switch - it comes with two NO contact blocks, doesn't it?

There's no "normal" set of contact blocks, depends on what the seller's selling. Sometimes they'll sell 3 different versions with different contact blocks. In my instructions I list what's needed so that you can make sure to get the right contact blocks.

Quote:
Is it possible to add a contact block for the middle (OFF) position as well?

Nope. I've never seen a switch with 3 contact blocks side by side. Always 2 beside each other at most. You can piggy-back as deep as you want however.

Quote:
Or is the middle position only empty, selecting neither of the contact blocks?

Correct.

Kal

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crush



Joined: 28 Dec 2010
Posts: 709
Location: Telemark, Norway


PostLink    Posted: Wed Jan 19, 2011 3:17 am    Post subject: Reply with quote

Thanks for the confirmation Kal.

That means I'll have to use two NC contacts stacked on the existing NO contacts to emulate a contact for the middle position. Current will only flow through both NC contacts when the switch is in the middle position.

EDIT: The two NC contacts are already present, from the safe start interlock. Great! Smile

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kal
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Joined: 12 Dec 2010
Posts: 10136
Location: Ottawa, Canada

Drinking: German Lager, Electric Hop Candy Jr, Scottish 70/-, Cali Common, Maibock, Helles, Russian Imperial Stout, Black Butte Porter

Working on: Weizen


PostLink    Posted: Wed Jan 19, 2011 3:38 am    Post subject: Reply with quote

Yup! That makes sense!

Kal

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