Electrical interlock circuit

Postby salads01 » Fri Aug 04, 2017 16:05

Hi I am looking for a interlock circuit diagram and hardware list for a system that would ensure that two 4.5kw electrical elements could never run concurrently on a 32a feed. First to run needs to
Lock the other out

Can any one post a solution ?

Cheers

Andrew Smith
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Re: Electrical interlock circuit

Postby Aleman » Fri Aug 04, 2017 16:44

Welcome Mr Smith (I)
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Re: Electrical interlock circuit

Postby LeithR » Fri Aug 04, 2017 16:48

I'm no electrician, but I would have thought you would find this sort of thing by just googling it.
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Re: Electrical interlock circuit

Postby salads01 » Fri Aug 04, 2017 17:03

I've tried googling but don't get anything useful with several search strings
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Re: Electrical interlock circuit

Postby HTH1975 » Fri Aug 04, 2017 20:06

What are you trying to achieve by stopping the two elements running together?
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Re: Electrical interlock circuit

Postby salads01 » Fri Aug 04, 2017 21:44

Overloading a 32a feed with 9kw or 37.5a. They should never need to run concurrently but want protection just in case I forget to turn a PID. Controller off and they triy to fire both elements (one in MT and one in COPPER)
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Re: Electrical interlock circuit

Postby Eric » Fri Aug 04, 2017 21:58

In a semi drunken state, something in my head says, wire the elements in series and in parallel place a single pole, change over switch which will effectively bypass one or other of the elements.
I'll leave it to someone with less beer on board to explain or rubbish what I've writ.
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Re: Electrical interlock circuit

Postby salads01 » Fri Aug 04, 2017 22:04

I think a simple solution would be to use the 12vdc switching feed to the ssr for element in MT to switch on and off the 12vdc switching fed feed for ssr for element in copper.

However this would always give the MT ellement priority and allow an a idental firing of the MT element to turn off the copper ellement which is not quite what I am after as I want it to be bidirectional with which ever ellement is currently on locking out the other one
Be
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Re: Electrical interlock circuit

Postby salads01 » Fri Aug 04, 2017 22:05

Manual switch is not what I am after needs to be automatic
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Re: Electrical interlock circuit

Postby salads01 » Fri Aug 04, 2017 22:08

Single pole change over relay is what I just suggested but this always gives priority to one element rather than
Priority to the ellement currently firing
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Re: Electrical interlock circuit

Postby jaroporter » Sun Aug 06, 2017 23:09

well a pair of mechanically interlocked contactors would do what you want, but the issue i'm thinking is that without a changeover switch as soon as the pid cycles off, the previous pid/element could take over and lock out the one you want to be using. but it also depends on where you locate the contactors. but of course it's hard to come up with solutions without knowing how you intend to run your system and more specific requirements. and also because it's late and i too have had a few..
i wonder if the process control forums are a better place to get advice after 10pm than a brewing forum.. :lol:
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Electrical interlock circuit

Postby LeeH » Sun Aug 27, 2017 17:36

Doubt it, we're all piss pots on there too!


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Electrical interlock circuit

Postby LeeH » Sun Aug 27, 2017 17:42

Google a DOL circuit...you will need 1 for each. A and B

Then interlock the B start circuit through the NC (normally closed) contact on contactor A.

Jaroporter is correct, much more detail of the process is required.




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