Help Req with SSR Leakage
Help Req with SSR Leakage
(OP)
I have set up a test rig to test out Temperature controllers. An SSR is activated to switch on a 240V LED when the T/C is calling for Heat. Trouble is that even when the SSR is not switched on there is a leakage current across it that lights the LED anyway. I spoke to the SSR manufacturer (Crydom) who said "yes there will be leakage across due to the internal snubber, enough to light a 10mA LED". They suggested either to use a snubberless SSR or put a power resistor in parrallel with the LED to null the leakage current. I cant remember my maths and what ever resistance I use across the LED, it only dims it very slightly. Any advice on solving this problem, formulae / resistor size / or any other advice greatfully recieved.





RE: Help Req with SSR Leakage
But, hey! You have your heating elements connected already? They should load the SSR enough to prevent the LED from turning on. Why do you see the LED? Load not connected?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Help Req with SSR Leakage
The problem you are encountering drives engineers nuts constantly, as the techs or the customer go out with their trusty DMM and then start calling us with "Hey the SSR is ON even when the control to it is off!" No. That's just the snubber leakage.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Help Req with SSR Leakage
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Help Req with SSR Leakage
RE: Help Req with SSR Leakage
OR
other manufacturers have an LED that represents the control input status. Just watch that LED, and you are done! Just google: "solid state relays" and then click IMAGES. You'll see lots of pictures of SSRs. Pick one that has an LED. We prefer the models with a green LED that means ON.
RE: Help Req with SSR Leakage
IN PLACE OF the input of the SSR.
Plesae read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>
RE: Help Req with SSR Leakage