Author Topic: 2NO 2NC SSR  (Read 4928 times)

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Offline RyanG

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Re: 2NO 2NC SSR
« Reply #25 on: April 28, 2017, 12:22:23 am »
So, I finally got the parts to put this all together. It doesn't work. I'm thinking it has to do with the FOD814. I am using the last schematic that BrianHG posted. I think that the C and E of the 5V side are backwards. Is that all that it could be? The NC and NO sides work with just the 12V line connected, but when I connect the 24VAC it doesn't light the LED or swap the closed to open and vice versa.
 

Online BrianHG

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Re: 2NO 2NC SSR
« Reply #26 on: April 28, 2017, 06:17:22 am »
Yup, the C&E are backwards.  If the 74HC14 is powered and wired correctly, applying 24v should turn it on.
Also check pin1 of the 74HC14, it should be high/5v, then, when you apply 24v ac, or even dc at the input, it should go to GND/0v.
« Last Edit: April 28, 2017, 06:19:27 am by BrianHG »
__________
BrianHG.
 

Offline RyanG

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Re: 2NO 2NC SSR
« Reply #27 on: April 28, 2017, 06:19:20 am »
Thank you. I tried swapping it earlier and it did work.  :-+
 

Offline Zero999

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Re: 2NO 2NC SSR
« Reply #28 on: April 28, 2017, 07:39:32 am »
Thank you. I tried swapping it earlier and it did work.  :-+
Good, I'm glad it works but is it safe?

Have you left sufficient creepage and clearances between the mains and 24V sides?

Is it build on a breadboard, stripboard or proper PCB? What's the minimum distance between anything on the mains side of the opto-coupler and 24V side?
 

Offline RyanG

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Re: 2NO 2NC SSR
« Reply #29 on: April 28, 2017, 08:26:06 am »
It's on a PCB with some stuff jumped around for the optocoupler. My creepage and clearance should be good. I used one of the calculators on a website.
 


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