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Old 01-22-2011, 02:32 AM   #1
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Default Need some advice on this electrical diagram

Guys,

Need some input if this diagram looks correct. I only want to run one element at a time and be able to switch between them with a 3 position switch. The system will be controlled with a BCS460 that I've been using for about a year now. The part I'm getting confused on is the mechanical relays and the 3 position switch. Thanks for any input!

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Old 01-22-2011, 03:15 AM   #2
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The only change I might make is to wire the SSRs behind the relays, that way the SSRs are also cold when the switch is off for that leg.

Functionally, it doesn't make a difference. I just would rather not have it actually switching voltage when that leg isn't turned on.

-Joe

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Old 01-22-2011, 03:17 AM   #3
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Also out of curiosity, why are you using SSRs for the pumps? Are you controlling them with a BCS or something?

Here is 1/2 of my system's wiring just to illustrate what I was saying about the SSRs behind the relay (which I called a contactor here).



-Joe

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Old 01-22-2011, 03:24 AM   #4
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The pumps will be controlled by the BCS. I'll try to draw up another diagram with your suggestion.

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Old 01-22-2011, 03:24 AM   #5
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I would also suggest to put the SSRs behind the relays. Any reason why you're running a second breaker for your 110V stuff as opposed to just taking one of your legs from the 220V breaker and wiring that through to your pumps?

I'm doing something similar to you. Here's my schematic:

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Old 01-22-2011, 03:52 AM   #6
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Alright so I think I'm confusing myself here. So when you guys are talking about putting the SSR's behind the relays, are you talking about moving leg 2 from the 240 and moving it to the SSR and then to the mechanical relay?

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Old 01-22-2011, 04:00 AM   #7
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I just realized my schematic doesn't show the contactor where nostalgia and I are suggesting.

I'll redraw my schematic in the morning to show it the right way.

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Old 01-22-2011, 04:02 AM   #8
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Mine does show it though - imagine my contactor is your relay. See how the black lead going to the SSR is switched by the relay? That means when your 3-way switch shuts off the contactor, there will be no power to the SSR.

-Joe

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Old 01-22-2011, 04:03 AM   #9
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I think I may understand. Basically i need to go from the breaker to the mechanical relay, then to the SSR, then to the element

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Old 01-22-2011, 04:04 AM   #10
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Correct.

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