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-   -   looking for a solution to the ssr leakage / indicator light problem. (http://www.homebrewtalk.com/f170/looking-solution-ssr-leakage-indicator-light-problem-376020/)

-TH- 12-23-2012 11:33 PM

looking for a solution to the ssr leakage / indicator light problem.
 
I have a 240v led connected t
o one hot leg and also the ssr-switched leg with the intent for it to be on when the ssr closes. My research here (also verified by personal experience) shows that the ssr will leak current enough to turn on the led at all times, unless the element is plugged in. For most this is ok but I would really like for it to function properly even when the element is unplugged. Is there any way I can make this work the way I want it to?

slakwhere 12-23-2012 11:43 PM

use a 12v LED on the signal side instead of the high voltage side?

-TH- 12-24-2012 02:37 AM

Quote:

Originally Posted by slakwhere (Post 4711118)
use a 12v LED on the signal side instead of the high voltage side?

Yeah I could do that, but there aren't any 12v LEDs available that match the other two on my panel.

I thought I saw a post on another thread somewhere suggesting the use of a resistor in parallel with the LED.

stlbeer 12-24-2012 02:42 AM

Quote:

Originally Posted by -TH- (Post 4711103)
I have a 240v led connected t
o one hot leg and also the ssr-switched leg with the intent for it to be on when the ssr closes. My research here (also verified by personal experience) shows that the ssr will leak current enough to turn on the led at all times, unless the element is plugged in. For most this is ok but I would really like for it to function properly even when the element is unplugged. Is there any way I can make this work the way I want it to?

One possible solution is to not use an SSR. In it's place you could simply use a relay or contactor. It would be a bit more noisy and the relay contacts would eventually wear out (after about a million cycles), but it would achieve your objective.

If you do this, make sure you use a PID capable of relay output like the Auber SYL-2362 or SYL-2342.

mrwizard0 12-24-2012 02:45 AM

P-J suggested the resistor in badnewsbrewery's build thread

BadNewsBrewery 12-24-2012 03:19 AM

Yup... suggestion was a 3k ohm, 200w resistor. Looks to be about $40 for one of them...

passedpawn 12-24-2012 04:11 AM

Strap a PTC fuse in parallel with the LED.

When the current is low (i.e., under the "trip current" of the fuse), the fuse looks like a short and the leakage current bypasses the LED.

When the current exceeds the trip current, the PTC heats up and becomes very resistive. This allows the LED to turn on.

Has anyone measured the leakage current?

passedpawn 12-24-2012 04:35 AM

Or, maybe a series resistor and varistor in series with an LED.

jCOSbrew 12-24-2012 10:38 PM

If you have 4 wire power in you could connect 120v indicator from SSR output to common.

milesvdustin 12-24-2012 10:43 PM

I wired mine just to show what element I was powering at the time regardless of ssr activity. Wired the indicators to my switch.


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