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Old 04-12-2011, 06:30 PM   #1
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Question Advice on control panel wiring

After looking at several PJ wiring diagrams I came up with this. (Thanks PJ for the examples it made making this a lot easier.)

Please comment on what I have incorrect here as it just does not seem correct for some reason.

Thanks in advance..

wire-post.jpg  
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Old 04-12-2011, 09:21 PM   #2
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What's the yellow button? An emergency stop implemented by forcing GFCI to trip?

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Old 04-12-2011, 09:47 PM   #3
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The only comment I would make is that the e-stop (if that's what it is) is going to cause 7.2 watts in your 2k resistance. Probably not really an issue that this is over spec of the resistor because the GFCI will trip pretty fast, but something to think about.

The only other thing I can think of is that you might want a very small fast acting fuse to protect the PIDs and some small slow-blow fuses protecting the pumps.

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Old 04-13-2011, 01:05 AM   #4
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Quote:
Originally Posted by Walker View Post
What's the yellow button? An emergency stop implemented by forcing GFCI to trip?
Yes. The circuit is in place to trip the GFCI in the main panel. It is setup as an "Emergency Stop" that provides 0.06A of ground fault current.

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Originally Posted by Walker View Post
The only comment I would make is that the e-stop (if that's what it is) is going to cause 7.2 watts in your 2k resistance. Probably not really an issue that this is over spec of the resistor because the GFCI will trip pretty fast, but something to think about.

The only other thing I can think of is that you might want a very small fast acting fuse to protect the PIDs and some small slow-blow fuses protecting the pumps.
Come on Walker, Do you REALLY think that your calculated 7.2 watts of power drawn will damage the resistors? Really? Come on. We are talking about a millisecond here.

The fuse illustrated to protect the PID is a "1A Fast Blow". Do you have a suggestion for some other device? How about a link?

Re: The pump. Say you have a pump that you set up to plug into a 120V outlet. (Hey, it's a simple system, Ok?) Would you add a fuse in line to protect the pump? I think not. The diagram shows that the pump is protected by a 15A breaker in the panel. Now what?

Walker, I sincerely apologize for a somewhat curt answer. Sometimes we tend to over think 'stuff'. I'd love to have the opportunity to talk with you about "stuff". I think it would be a fun conversation.

HempelNet,

Once you come up with the 'final' plan and would like a diagram for your records, I'd be more than happy to draw it out for you.

BTW, Thank you for honoring my diagram. I have lots more.

Paul
(P-J)
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Old 04-13-2011, 01:21 AM   #5
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Quote:
Originally Posted by P-J View Post
Come on Walker, Do you REALLY think that your calculated 7.2 watts of power drawn will damage the resistors? Really? Come on. We are talking about a millisecond here.
No, I don't think it will be a problem, and that's why I specifically said "probably not really an issue".


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The fuse illustrated to protect the PID is a "1A Fast Blow". Do you have a suggestion for some other device? How about a link?
No other suggestion. I simply overlooked it when I looked at the diagram the first time.


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Originally Posted by P-J View Post
Re: The pump. Say you have a pump that you set up to plug into a 120V outlet. (Hey, it's a simple system, Ok?) Would you add a fuse in line to protect the pump? I think not. The diagram shows that the pump is protected by a 15A breaker in the panel. Now what?
If I were just plugging the pump into the wall, then... no... I probably wouldn't have a fuse there because it would be a PITA to build a box with a fuse and receptacle or whatever.

But... if given the opportunity to spend $3 for fuse to put into a box I was already building to better protect a piece of equipment that cost over $100, then I would ABSOLUTELY do it. No doubt about it.

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Walker, I sincerely apologize for a somewhat curt answer.
Apology accepted.
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Old 04-13-2011, 01:36 AM   #6
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I must have accidentally erased the last part of my post (in response to the "over thinking").

I am 100% certain that I over think things. It's in my nature and what I get paid to do when I am disguised as a mild mannered engineer.

e-stop resistors : not a big deal

PID fuse : already there. I didn't see it.

Pump fuse : a well spent $3

I do have to ask you, P-J: why suggest a fuse for the PID (a $45 item) but not for the pump (a $125 item)?

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Old 04-13-2011, 01:50 AM   #7
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...
I do have to ask you, P-J: why suggest a fuse for the PID (a $45 item) but not for the pump (a $125 item)?
You made me laugh. thanks.!
The PID can be wired wrong in a way that it can easily be damaged. No so with the pump. The pump is most commonly wired to a 15A circuit without issues. Just to mention: The pump was designed for circulation of water in a heating system - not for brewing. It is most commonly wired to breakers that protect the wiring. (15A - 14 gauge wire)
I do see your point however.

Thanks for the added post.
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Old 04-13-2011, 01:52 AM   #8
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You made me laugh. thanks.!
The PID can be wired wrong in a way that it can easily be damaged. No so with the pump. The pump is most commonly wired to a 15A circuit without issues. Just to mention: The pump was designed for circulation of water in a heating system - not for brewing. It is most commonly wired to breakers that protect the wiring. (15A - 14 gauge wire)
I do see your point however.

Thanks for the added post.
I saw no mention of what pump he was using, so I made no assumptions.
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Old 04-13-2011, 01:56 AM   #9
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I've never seen the e-stop that trips the GFCI is this common practice? I think I'd like to add the to mine.

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Old 04-13-2011, 02:01 AM   #10
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Quote:
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I saw no mention of what pump he was using, so I made no assumptions.
Congrats!!!

Uncle.! You win!
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