Failed SSR - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Electric Brewing > Failed SSR

Reply
 
Thread Tools
Old 02-06-2013, 05:33 PM   #1
redman67
HBT_SUPPORTER.png
 
redman67's Avatar
Recipes 
 
Feb 2010
Taunton, MA
Posts: 426
Liked 22 Times on 19 Posts



So it happened to me

The last two brews my PID has been over shooting set temps by a few degrees and I could'nt figure out why.

I needed to replace a switch so I took the opportunity to rewire my indicator light to the output of the SSR so I would have a visual indicator of when the element was firing, so that I could wait till it was'nt, to flick said switch.

Anyways, I get that wired in and turn on the control panel and the light lights. Change set value to below process value and the light remains on, although dimmer this time.

Get out the volt meter and come to find that I have 32 volts on the cord.

I guess that my SSR has failed partially closed
What do you guys think?
__________________
Because God hates it when you drink bad beer

 
Reply With Quote
Old 02-06-2013, 05:44 PM   #2
P-J
HBT_LIFETIMESUPPORTER.png
Recipes 
 
Mar 2010
Charlotte, NC
Posts: 3,336
Liked 302 Times on 235 Posts


I think you are measuring the values without a load wired into the SSR output. If that is the case, all bets are off in trying to measure anything.

Just saying.

 
Reply With Quote
Old 02-06-2013, 06:01 PM   #3
Chrisl77
Recipes 
 
Mar 2011
Jackson, New Jersey
Posts: 892
Liked 86 Times on 68 Posts


What p-j said. When i measure the voltage of my ssr output without a load i get 120v. When i put a load on it i dont get leakage.
__________________
Ocean County home brew club

 
Reply With Quote
Old 02-06-2013, 06:05 PM   #4
redman67
HBT_SUPPORTER.png
 
redman67's Avatar
Recipes 
 
Feb 2010
Taunton, MA
Posts: 426
Liked 22 Times on 19 Posts


Thanks I will check that now
__________________
Because God hates it when you drink bad beer

 
Reply With Quote
Old 02-06-2013, 07:14 PM   #5
MagooBrew
Recipes 
 
Dec 2012
Posts: 927
Liked 48 Times on 38 Posts


Deleted
__________________
"A flute with no holes is not a flute......
....... and a doughnut with no hole is a Danish."

Ty Webb

 
Reply With Quote
Old 02-06-2013, 07:15 PM   #6
MagooBrew
Recipes 
 
Dec 2012
Posts: 927
Liked 48 Times on 38 Posts


This is where a "wiggy" style meter is worth its weight in gold. It has a built in solenoid to present a load to the circuit. Modern digital multimeters do not have enough input impedance to load the relay. In the electrical classes I teach, this is one of the first things we discuss when we talk about meters.
__________________
"A flute with no holes is not a flute......
....... and a doughnut with no hole is a Danish."

Ty Webb

 
Reply With Quote
Old 02-07-2013, 12:13 AM   #7
redman67
HBT_SUPPORTER.png
 
redman67's Avatar
Recipes 
 
Feb 2010
Taunton, MA
Posts: 426
Liked 22 Times on 19 Posts


Im sorry guys, but Im not picking up what your throwing down

If I connect the load to the plug I will have no place to take a reading
Are you saying that the SSR will allow voltage to pass through it when it is not being told to be closed by the PID?
__________________
Because God hates it when you drink bad beer

 
Reply With Quote
Old 02-07-2013, 12:17 AM   #8
MagooBrew
Recipes 
 
Dec 2012
Posts: 927
Liked 48 Times on 38 Posts


Exactly. It will appear that the SSR is in a "closed" position until a load is put on the circuit. Take the voltage reading at the output terminal opposite of the line voltage supplied.
__________________
"A flute with no holes is not a flute......
....... and a doughnut with no hole is a Danish."

Ty Webb

 
Reply With Quote
Old 02-07-2013, 12:40 AM   #9
redman67
HBT_SUPPORTER.png
 
redman67's Avatar
Recipes 
 
Feb 2010
Taunton, MA
Posts: 426
Liked 22 Times on 19 Posts


so should'nt it show the full 120 volts not just 32 with or without load
__________________
Because God hates it when you drink bad beer

 
Reply With Quote
Old 02-07-2013, 12:46 AM   #10
Psych
 
Psych's Avatar
Recipes 
 
Mar 2011
Kelowna, BC
Posts: 780
Liked 37 Times on 34 Posts


Also, isn't your PID telling you exactly when your element is firing? It has a light, it blinks...what are you firing the SSR from, control-wise? My Auber PID has a nice light that coincide's with the SSR firing.

But yeah voltage measuring through an SSR is whack jack. Fully closed I get full voltage. Don't bother. Use a "does my element turn on and heat properly" measure, instead.

But really I wouldn't bother putting in a light to tell you when your SSR is firing or not, if you need that then mount the SSR in such a way that it's visible.

It has a plastic case on it and a light on it for this reason, no?

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
conversion failed? DougmanXL Gluten Free Brewing 10 10-05-2012 05:20 AM
Failed Cork retty Mead Forum 2 08-06-2011 10:02 PM
I think I failed JonClayton Fermentation & Yeast 5 03-12-2010 04:23 PM
failed primary burning2nd Beginners Beer Brewing Forum 25 01-01-2010 02:50 AM
you have all failed me JWHooper Drunken Ramblings and Mindless Mumbling 14 09-01-2008 02:17 AM


Forum Jump