|
|
|
|
|
View previous topic :: View next topic |
Author |
Message |
bobby4
Joined: 30 Oct 2014 Posts: 9
|
Link Posted: Sun Jun 28, 2020 3:59 pm Post subject: Within design relay temperatures? |
|
|
I have a slightly modified electric brewery build that was put together by my control tech father-in-law. There are a few parts I bought from Auberins back before Kal was selling them. We just replaced a dead contactor with one of Kal’s, but now the main power contactor is running a bit warm. It is a back to back setup with 2x5500w elements, running on 240v. Everything is sized right. We are going to clean the contacts and check them, but I am wondering what is a typical external temperature for the relay? Ours is heating up to 65 with just one leg running.
|
|
Back to top |
|
|
kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11123 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
|
Link Posted: Sun Jun 28, 2020 4:07 pm Post subject: |
|
|
Hi!
I'm brewing today and am a few hours into mashing, so I popped open the enclosure and used my laser thermometer to measure temps.
Power in relay: 40C
HLT relay: 40C
Boil relay: 34C (not in use yet so it's the ambient enclosure temp)
Mine's the standard 30A setup.
You mention both contactors and relays. I'm assuming your back to back panel is based off my 50A back to back design? That would use a 50A (or higher) contactor for power in, and then 30A (or higher) relays or contactors for boil and hlt. 50A relays are hard to find so you typically don't see those for the power in. Also confused how you would clean the contacts on the power in device as only relays can be opened. Most contactors are sealed. That said, you should never have to clean relay contacts on correctly designed equipment (I never have and have been running this panel since 2009).
Cheers!
Kal
_________________ Our new shop with over 150 new products: shop.TheElectricBrewery.com
We ship worldwide and support our products and customers for life.
Purchasing through our affiliate links helps support our site at no extra cost to you. We thank you!
My basement/bar/brewery build 2.0
|
|
Back to top |
|
|
bobby4
Joined: 30 Oct 2014 Posts: 9
|
Link Posted: Sun Jun 28, 2020 4:19 pm Post subject: |
|
|
Yes, it is based on your panel. Sorry, being the non-tech guy I am butchering the language. By cleaning I meant where the wires attach, the contacts for the contactors.😄. Plus check the wires don’t have frayed strands, etc. The two legs are the same as yours, nice and cool. It is the main relay that is running warm on one corner, around 65. That is on the continuous heating run, once it is just holding the temp it cools down.
Also, thanks for checking!
|
|
Back to top |
|
|
kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11123 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
|
Link Posted: Sun Jun 28, 2020 4:30 pm Post subject: |
|
|
You raise a good point: It may not be the relay/contactor itself that's running hot from normal use but a poorly done connection that is overheating (and that heat will spread).
Heat is created when current flows through an area that is too small to handle the amount of current. This can happen:
(a) with a loose connection where only a few strands are making contact because the wire is not properly tightened/fastened, and/or
(b) a wire that is too small to handle the current is used, and/or
(c) when a properly sized wire is used but some of the copper strands were cut/trimmed to get it to fit (this should never be done)
All of these cases effectively reduce the contact area meaning that more current flows through a smaller area which in turns creates more heat which can melt the insulation on wires and damage nearby components.
It could also be that you’re actually pulling too much current by using oversized heating elements. This would only be possible if an incorrectly sized breaker was installed in the electrical panel (larger than 50 amps) as otherwise the breaker would pop if more than 50A was pulled. Doesn't sound like this is the case however as you mentioned 2 x 5500W heating elements.
Cheers!
Kal
_________________ Our new shop with over 150 new products: shop.TheElectricBrewery.com
We ship worldwide and support our products and customers for life.
Purchasing through our affiliate links helps support our site at no extra cost to you. We thank you!
My basement/bar/brewery build 2.0
|
|
Back to top |
|
|
Fal
Joined: 29 Dec 2014 Posts: 70
|
Link Posted: Sun Jun 28, 2020 8:08 pm Post subject: |
|
|
I have not had issues since replacing my plugs, but I'm curious to the maximum operational ambient temperature for the panel. I live in south Alabama. I'm brewing today. It's currently 95F outside with no wind. I'm in a garage and it's probably close to 110 and humid since there is no wind moving air in or out.
|
|
Back to top |
|
|
kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11123 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
|
|
Back to top |
|
|
|
|
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You can download files in this forum
|
Forum powered by phpBB © phpBB Group
|
|