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Mikek340403
Joined: 18 Dec 2021 Posts: 5 Location: Minnesota
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Link Posted: Sat Dec 18, 2021 12:58 am Post subject: 240v 30 amp biab controller |
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Hi new here. Looking for a good wiring diagram for a 240v 30amp contactor. Building a controller and want to have the main come threw the contactor that will be controlled by a e stop mushroom button. It’s a 3 terminal button off Amazon. The contactor is a dual pole 240v 30 amp contactor. The non din style. As far as everything else I have that figured out. Just not 100% sure how to wire this end.
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Mikek340403
Joined: 18 Dec 2021 Posts: 5 Location: Minnesota
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Link Posted: Sat Dec 18, 2021 1:01 am Post subject: |
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This is the contactor I am planning on using
Migro 2 Pole 40 AMP Heavy Duty AC Contactor Replaces Virtually All Residential 2 Pole Models (2- Year Warranty Silver Alloy Content Contactors) https://amzn.to/33GppcE
This is the estop switch I was planning on using
1PCS NC Latching Red Sign Mushroom Emergency Stop Push Button Switch https://amzn.to/3F9n0Fe
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11121 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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Mikek340403
Joined: 18 Dec 2021 Posts: 5 Location: Minnesota
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Link Posted: Sun Dec 19, 2021 11:19 pm Post subject: |
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So update. After digging threw the web found out this contactor will not work without a capacitor to control it. Found a 240v 40a 240v induction winding capacitor. And from what I can tell the line in is connectors to the other side induction coil winding. So I just connector both induction coil winding threw a fused switch and that completes the magnetic winding circuit and pulls the contactor open
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11121 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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Mikek340403
Joined: 18 Dec 2021 Posts: 5 Location: Minnesota
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Link Posted: Wed Dec 22, 2021 1:07 pm Post subject: |
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True I didn’t think of that. The resistance of the induction coil is 770ohms so .3ampa. Switch stays hot when on so the contacts should stay pulled down. But if I have a problem I’ll look into this. Thanks
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11121 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 Dec 22, 2021 3:39 pm Post subject: |
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The current draw from the coil is likely much lower than that. Remember that coils have inductance (not just pure resistance) so you can't measure the resistance of a coil using a multimeter (as it uses DC).
Case in point: With any of our control panels powered up but not driving pumps or heating elements, they draw about 1/3 of what you're seeing (0.1 amps) and that's with a lot more things powered: 1 or 2 contactor (or relay) coils closed and power also to: 3 PIDs, Blue power on LED, volt meter, amp meter, 2 power supplies, 2 transformers.
If you want to measure the current draw of the coil you need to use an inline (or clamp) amp meter.
Kal
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Mikek340403
Joined: 18 Dec 2021 Posts: 5 Location: Minnesota
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Link Posted: Fri Dec 24, 2021 12:21 am Post subject: |
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Ok well I’m going to put it together and keep this bit of info in my head. If I am having a problem with the contactor not staying open I’ll swap out for one of the ones you linked. Thank you for the advise. Was starting to feel like no one had was going to chime in.
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11121 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: Fri Dec 24, 2021 1:09 am Post subject: |
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Mikek340403 wrote: | If I am having a problem with the contactor not staying open ... |
That's backwards. Most contactors are normally open. You need to energize the relay to close it.
Mikek340403 wrote: | Was starting to feel like no one had was going to chime in. |
I think part of the problem is it's not clear what you're doing and the details you've provided are too vague to provide any guidance. Really all I've been doing is pointing out things that are incorrect in case it helps out. I have no idea what you're building or doing so how to build what you want is very much an unknown as it's not clear. Sorry!
Kal
_________________ Our new shop with over 150 new products: shop.TheElectricBrewery.com
We ship worldwide and support our products and customers for life.
Purchasing through our affiliate links helps support our site at no extra cost to you. We thank you!
My basement/bar/brewery build 2.0
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