Electric Brewing Supply 30A BCS Giveaway!


Home Brew Forums > Home Brewing Beer > Electric Brewing > P-J Diagrams 240 V Contactor?
Reply
 
LinkBack Thread Tools
Old 12-01-2011, 08:46 PM   #1
rcooper44537
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2010
Location: London, Ontario
Posts: 17
Default P-J Diagrams 240 V Contactor?

In P-J's diagrams he always uses a contactor along with an SSR to switch the heaters. Can someone give me a detailed explanation of why you need the contactor? Just a little confused is all,

Thanks guys,

Russ

__________________
rcooper44537 is offline
 
Reply With Quote Quick reply to this message
Old 12-01-2011, 08:54 PM   #2
voltin
Beholden to the Yeast
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
voltin's Avatar
Recipes 
 
Join Date: Jul 2011
Location: Lubbock, TX
Posts: 415
Liked 13 Times on 11 Posts
Likes Given: 7

Default

The contactors are used to "physically" disconnect the element from the control panel wiring. This allows for you to keep the PID on (to monitor temperature for example) while turning off the element.

__________________
voltin is offline
 
Reply With Quote Quick reply to this message
Old 12-01-2011, 09:00 PM   #3
birvine
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2010
Location: Cochrane, Ontario, CANADA
Posts: 1,512
Liked 10 Times on 10 Posts
Likes Given: 4

Default

Quote:
Originally Posted by voltin View Post
The contactors are used to "physically" disconnect the element from the control panel wiring. This allows for you to keep the PID on (to monitor temperature for example) while turning off the element.
Safety and more flexibility then? So, it would also be a good idea for a 120v element BK. ie independent of element size?

B
__________________
Manager & Head Brewer
Swan Lane Brewery
birvine is offline
 
Reply With Quote Quick reply to this message
Old 12-01-2011, 09:03 PM   #4
Boerderij_Kabouter
Feedback Score: 0 reviews
 
Boerderij_Kabouter's Avatar
Recipes 
 
Join Date: Dec 2007
Location: Oconomowoc, Wisconsin
Posts: 8,461
Liked 119 Times on 103 Posts
Likes Given: 11

Default

I am not sure what P-J is using them for, but typically a contactor is a good idea because if a contactor fails, it will fail into an open position (no current flowing through), whereas a SSR will fail closed. It is for safety.

Boerderij_Kabouter is offline
 
Reply With Quote Quick reply to this message
Old 12-01-2011, 09:06 PM   #5
shortyjacobs
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: Twin Cities, MN
Posts: 2,511
Liked 29 Times on 29 Posts
Likes Given: 3

Default

SSRs leak current, so with the SSR "off", there's still a bit of juice going to the element.

More importantly, if you fire your element with the kettle dry, you'll blow it. Most of us like the extra security of a physical disconnect controlled by a switch we can manipulate, to be SURE we only fire the element when we want to. On my setup, I'll have contactors controlling power to both the 120V RIMS and 240V BK element, plus a contactor to control main power to the panel. Feels better having complete, physical control of current flow.

__________________
Itchy Dog Brewery.

(As of 10-24-2011)
Primary - Steppe 112 PA, 2x Monday RyePA
Aging - None :-(
On tap - Big Dog, Apfelwein, Steppe 112 PA

My invisible AG sculpture, with no actual sculpture and a tiny footprint.
My Kegerator goes offroading!
My Coors Home Draft dispenser for boating/beering on the go.
shortyjacobs is offline
 
Reply With Quote Quick reply to this message
Old 12-01-2011, 09:09 PM   #6
voltin
Beholden to the Yeast
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
voltin's Avatar
Recipes 
 
Join Date: Jul 2011
Location: Lubbock, TX
Posts: 415
Liked 13 Times on 11 Posts
Likes Given: 7

Default

Yep, what shortyjacobs said. On my single vessel panel, I have a contractor for both the main and element power.

__________________
voltin is offline
 
Reply With Quote Quick reply to this message
Old 12-01-2011, 09:11 PM   #7
birvine
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2010
Location: Cochrane, Ontario, CANADA
Posts: 1,512
Liked 10 Times on 10 Posts
Likes Given: 4

Default

Quote:
Originally Posted by voltin View Post
Yep, what shortyjacobs said. On my single vessel panel, I have a contractor for both the main and element power.
I'm convinced.

B
__________________
Manager & Head Brewer
Swan Lane Brewery
birvine is offline
 
Reply With Quote Quick reply to this message
Old 12-01-2011, 09:50 PM   #8
rcooper44537
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2010
Location: London, Ontario
Posts: 17
Default

Thanks guys that clears that up for me. and cochrane ontario? where do you order parts / brewing supplies?

__________________
rcooper44537 is offline
 
Reply With Quote Quick reply to this message
Old 12-02-2011, 12:50 PM   #9
birvine
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2010
Location: Cochrane, Ontario, CANADA
Posts: 1,512
Liked 10 Times on 10 Posts
Likes Given: 4

Default Cochrane

Quote:
Originally Posted by rcooper44537 View Post
Thanks guys that clears that up for me. and cochrane ontario? where do you order parts / brewing supplies?
Interesting for me being where I am.

In terms of brewing supplies I either get them when I pass through North Bay (the brew-on-premises there has been amazing) and when I am in TO or nearby. In August I was in London and zipped over to BrewHaven for a few extra supplies.

The e-brewing will be a little trickier. Online ordering I suppose.

Brent
__________________
Manager & Head Brewer
Swan Lane Brewery
birvine is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
planning an electric build, can we sticky pj's diagrams? boswell Electric Brewing 13 08-18-2013 11:31 PM
SSR, Contactor? both? help me K.I.S.S mavrick1903 Electric Brewing 19 02-13-2013 05:57 AM
contactor recommendation jcalisi Electric Brewing 14 06-10-2011 04:51 PM
Contactor question GRHunter Electric Brewing 3 05-25-2011 11:32 AM
Mercury contactor vs. SSR burglar Electric Brewing 8 01-26-2011 01:48 AM