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Old 08-12-2011, 01:24 PM   #1
gitapaynts
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Default Dead ssr?

Looking for someone with a working ssr to measure resistance across the switch both when the control panel is off and when there is no input signal from the PID.

I think mine is fried from a direct fault since there is constant current flowing through it with or without PID signal (which appears to be triggering the signal correctly). Want to be sure it's dead before having to order a new one and heat sink and bust it out of my panel...

Cheers

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Old 08-12-2011, 02:09 PM   #2
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try this http://tinyurl.com/4zd9952

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Old 08-12-2011, 03:53 PM   #3
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Unlikely it's dead. All SSRs leak a few mA when "off". More than enough to get a reading on a DVM. Simply test your SSR with a load like an incandescent lamp.

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Old 08-12-2011, 04:32 PM   #4
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Even leaky, should I be getting 240v by measuring the output from the ssr with one probe and the other leg out of the power in? I assume not if the ssr isn't being triggered closed....

I guess I'll try the light test, but it will require me to do some additionally wiring for it all. Seems to me the way it is installed is essentially the same and telling me the ssr is failing to open....

I'm still wondering if anyone has measured resistance across the switch terminals of an ssr when there is no inout trigger signal and if they see 0 resistance like I do.

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Old 08-12-2011, 05:22 PM   #5
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Question... Is the element heating with the SSR input wires disconnected?

Just want to be sure.

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Old 08-12-2011, 05:28 PM   #6
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Good call. I'll double check when I skip out of work early this Friday afternoon... not like I'm getting mug done here with my brewery on the verge of completion.

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Old 08-12-2011, 05:38 PM   #7
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I'm really interested. (Taps foot and waits) -

P-J

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Old 08-12-2011, 05:39 PM   #8
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Quote:
Originally Posted by gitapaynts View Post
Even leaky, should I be getting 240v by measuring the output from the ssr with one probe and the other leg out of the power in? I assume not if the ssr isn't being triggered closed....
Yes you absolutely should be seeing 240v. SSRs switch current, not voltage.
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Old 08-12-2011, 05:41 PM   #9
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Quote:
Originally Posted by gitapaynts View Post
Even leaky, should I be getting 240v by measuring the output from the ssr with one probe and the other leg out of the power in? I assume not if the ssr isn't being triggered closed....
This is exactly what mine did. I was a bit surprised by it too. It's not a mechanical switch though. You may see voltage but will not get current flow until its triggered.
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Old 08-12-2011, 08:51 PM   #10
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Just got home and per PJ unhooked the ssr and checked the element output. I get 1 volt across hots, 120 from 1 leg to neutral and 55 from the leg that was going through the ssr to neutral. The first two make sense to me, but I don't understand why I would get 55 from between the neutral and the disconnect other hot leg.

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