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Old 04-02-2013, 05:14 PM   #1
terodox
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Feb 2011
Concord, NH
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Hello All,

First I wanted to say thank you to everyone who responded to my earlier posts with wiring diagrams for my rims in a box build.

Now I have an interesting problem that I can't seem to figure out.

I've wired everything following the attached diagram. The area in red is my concern. If I have this light wired as shown then the SSR allows approx. 87v through all the time. When it goes active it allows the full 120v.

If I then disconnect the neutral side of this light, the voltage drops to 0 when the SSR isn't active.

I have no idea what is going on here.

The video shows first with light connected, then with neutral side of light disconnected.



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Old 04-02-2013, 05:19 PM   #2
BetterSense
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Jul 2011
Richardson, Texas
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Where is you element wired? I assume in series with the 'active light'?



 
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Old 04-02-2013, 05:45 PM   #3
Protto
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Aug 2011
Vangsnes, Norway
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Assuming your element is in series with your active light.
The SSR is not a physical switch as your symbol might indicate and even in an off state it has a small leakage current that will give a readable voltage on your meter. Some indicator lights may even light up from this leakage current.

 
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Old 04-02-2013, 05:46 PM   #4
terodox
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Feb 2011
Concord, NH
Posts: 108
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The element hasn't been wired in yet. I wanted to prove that the system is working using a light first before I have my element dry heating by accident.

Eventually it will be wired in parallel to the heating element so it doesn't have to deal with the amperage draw the element is going to cause.

 
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Old 04-02-2013, 05:50 PM   #5
terodox
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Feb 2011
Concord, NH
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Protto, based on what you're saying the voltage being provided is at a low current? If the indicator light is on (which it is all the time right now, just gets brighter when the ssr is active) doesn't that imply that the element would also be active?

I'm confused on the function of the ssr if it is allowing anything to flow through when it is not active.

 
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Old 04-02-2013, 06:02 PM   #6
theknub
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Feb 2013
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that is also quite a bit (87 v?) when off to be leaking
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Old 04-02-2013, 06:20 PM   #7
BetterSense
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Jul 2011
Richardson, Texas
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My incandescent indicator is ALWAYS on when my element is unplugged, even when the SSR is off, as long as my main contactor is on. This is NORMAL behavior for SSRs. They are not mechanical switches. They are not like the little flippy switch symbols you see on diagrams. They are solid state, high-currrent switching devices and leak current through small loads. Can we please get a sticky about this already?

 
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Old 04-02-2013, 06:32 PM   #8
terodox
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Feb 2011
Concord, NH
Posts: 108
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I apologize for my total lack of knowledge on this. If I want to wire an indicator light that is only on when the heating element is on, what is the best way to do this?

Thanks, and I apologize again for my lack of understanding on the SSR.

 
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Old 04-02-2013, 06:55 PM   #9
Protto
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Aug 2011
Vangsnes, Norway
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Quote:
Originally Posted by terodox View Post
Protto, based on what you're saying the voltage being provided is at a low current? If the indicator light is on (which it is all the time right now, just gets brighter when the ssr is active) doesn't that imply that the element would also be active?

I'm confused on the function of the ssr if it is allowing anything to flow through when it is not active.
Yes very low current. The only way is to use a lamp that has a high enough wattage to not light up when the SSR is on. -Or use a indicator lamp/LED on the low volt side of the SSR.

The heatingelement will only give milliWatts when SSR is off as it will pull down the open cirquit voltage you measured.

 
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Old 04-02-2013, 07:04 PM   #10
terodox
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Feb 2011
Concord, NH
Posts: 108
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ok cool, so wire the light in series and it should perform as I expect it to.

Thanks for all the quick feedback!



 
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