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-   -   Relay for 120v STC-1000 (http://www.homebrewtalk.com/f170/relay-120v-stc-1000-a-304274/)

seatbelt123 02-14-2012 06:31 PM

Relay for 120v STC-1000
 
Brain trust,

I have an extra STC-1000 and I want to experiment with using it to control the mash temps in my single vessel eBIAB. Yes, I understand the weakness of this controller for this application.

My kettle has two 2000w camco elements which are controlled by a manual switch. During mashing I only run one element for a minute or two every 10-15 minutes. So I don't REALLY need a controller but since I have most of the parts I thought it would be fun.

The element draws about 16 amps.

Questions:
1. What relay would you recommend? I'm biased towards cheap but easily tempted by cool.
2. How do you wire relay? It looks like they have four contacts...

Thanks in advance!

Misplaced_Canuck 02-14-2012 07:23 PM

Quote:

Originally Posted by seatbelt123 (Post 3785313)
My kettle has two 2000w camco elements which are controlled by a manual switch. During mashing I only run one element for a minute or two every 10-15 minutes. So I don't REALLY need a controller but since I have most of the parts I thought it would be fun.

The element draws about 16 amps.

Questions:
1. What relay would you recommend? I'm biased towards cheap but easily tempted by cool.
2. How do you wire relay? It looks like they have four contacts...

Thanks in advance!

Most solid state relays use DC for their input, the range I've seen is 3-24VDC or 3-32VDC and they draw very little DC power.

Think of it just like a standard one-way toggle switch, but instead of throwing the switch on + off by hand, the DC power throws the switch for you. You'd wire the relay as a switch on one leg of the input for the 2000W element.

As far as wiring it with a STC-1000, you would be wiring one leg (+ or -) thru the STC-1000 on the hot side. (The STC would be making + breaking the circuit to add heat). The output of the STC would then go to the solid state relay, where the other side of the DC would be wired to the other leg of the DC side of the relay.

Relay

MC

Misplaced_Canuck 02-14-2012 07:41 PM

Like this.

http://i41.tinypic.com/fx8o00.jpg

MC

weirdboy 02-14-2012 07:43 PM

They do make AC relays, too.

Misplaced_Canuck 02-14-2012 07:58 PM

Quote:

Originally Posted by weirdboy (Post 3785581)
They do make AC relays, too.

Good point, hadn't even thought of it.

AC input relay

MC

seatbelt123 02-14-2012 09:24 PM

Awesome! Thanks for the link too. $15 an free shipping. Nice.

Do I need a heat sink for this?

Edit: found a 120v AC to AC version that comes with a heat sink on the same site, $19.

mattd2 02-16-2012 09:25 AM

Since the STC1000 internal relay coils are 12VDC (well at least the units have 120/220V:12V transformers - then a rectifyer I'm guessing) could you not take it apart, desolder the relay(s), jump the coil pins to the output terminals, close it up and you have a 12VDC signal on the outputs to drive your SSR... just thinking outload :D

skipper1953 02-18-2012 06:18 PM

Quote:

Originally Posted by Misplaced_Canuck (Post 3785575)

How is the DC Power Supply being powered?

seatbelt123 02-18-2012 11:04 PM

Quote:

Originally Posted by skipper1953

How is the DC Power Supply being powered?

I think he's probably suggesting borrowing a supply from an old phone charger.

GriFF3n 05-20-2012 05:25 PM

Did you get anywhere with this seatbelt? Looking to do the same thing with my eKettle and STC-1000.


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