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crush
Joined: 28 Dec 2010 Posts: 706 Location: Telemark, Norway
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Link Posted: Wed Jan 19, 2011 1:31 am Post subject: 3 way switches |
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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: 11116 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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Link Posted: Wed Jan 19, 2011 2:11 am Post subject: Re: 3 way switches |
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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: 706 Location: Telemark, Norway
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Link Posted: Wed Jan 19, 2011 3:17 am Post subject: |
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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!
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11116 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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