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Topic: SSR relays not flipping (Read 628 times) previous topic - next topic

LeandroAR

Hi All,

I'm currently developing a home automation demo with:
- Arduino Mega 256
- Multiplexer PCF8574
- 8-SSR board (2A max)

Wiring and coding are fine, once I'm able to make an EMR (regular relay) close and open. But I can't make the SSR close. The led on the SSR turns on, but the conductivity test on the AC screws runs at 682 (I get 0 using EMR).

I tested the SSR with and without load (127VAC), same result. I tried running the control signal from 5VDC to 17VDC, nothing.

I'm going nuts! What am I missing here??? Any assistance is mostly appreciated!

apylypenko

Could the SSR be burnt or faulty?

LeandroAR

Could the SSR be burnt or faulty?
I tested it with 11 8-SSR-bank. I bought them from the same place, but 11 faulty?

Wawa

Not sure what you're doing, but an SSR has a minimum holding current.
Leo..


LeandroAR

#4
Sep 12, 2020, 12:07 am Last Edit: Sep 12, 2020, 12:12 am by LeandroAR
Not sure what you're doing, but an SSR has a minimum holding current.
Leo..
Hi Wawa, does this mean it won't work like EMRs? I'm simply replacing regular relays (EMR) by SSRs.

Wawa

European Metal Recycling?

Working voltage of a 3GMB-202P must be between 75V and 264V AC, and current between 0.1A and 2A.
See datasheet.
Leo..

LeandroAR

European Metal Recycling?

Working voltage of a 3GMB-202P must be between 75V and 264V AC, and current between 0.1A and 2A.
See datasheet.
Leo..
Sorry, EMR is electromagnetic relay, the "click" relay. I tested the SSR with 127V and current surely between this range. It just doesn't work. When I replace it with a regular relay, it works, same conditions.

Wawa

For proper help you need to follow the forum posting guidelines.
We need to see a diagram (not Fritzing), links, code (inside code tags), etc.
Leo..

ballscrewbob

@LeandroAR

Could you take a few moments to Learn How To Use The Forum.
Other general help and troubleshooting advice can be found here.
It will help you get the best out of the forum in the future.




It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google (who would have thunk it ! ) or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

TomGeorge

#9
Sep 16, 2020, 01:34 pm Last Edit: Sep 16, 2020, 01:35 pm by TomGeorge
Hi,
European Metal Recycling?

Working voltage of a 3GMB-202P must be between 75V and 264V AC, and current between 0.1A and 2A.
See datasheet.
Leo..
Where did this bit of info come from?  3GMB-202P ? ? ? ? ? ?
Tom... :)
Everything runs on smoke, let the smoke out, it stops running....

Wawa

I don't know any other 8-relay SSR board than the ones with 2Amp Omron 3GMB-202P relay modules.
Leo..

TomGeorge

Hi,
What is the load you are switching?
Can you post a picture, link to the SSR module you have please?

Thanks.. Tom.. :)
Everything runs on smoke, let the smoke out, it stops running....

LeandroAR

Folks,

Apologies for the delay, I was trying to use Eagle to draw the diagram, without much success...

The relay bank is a 3GMB-202P, but it must be a cheap copy, not sure. Follows its image.

And here's the code, pretty straight forward. VDC, GND and pin 30 are connected correctly, believe me!

I'm switching a very low load, 0.2A.

Code: [Select]

int ssrControlPin = 30;
void setup() {                
 // initialize the digital pin as an output.
 pinMode(ssrControlPin, OUTPUT);    
 digitalWrite(ssrControlPin, LOW); // set the SSR on
}

void loop() {}




TomGeorge

Hi,
The SSR is zero-crossing switching, not sure if  200mA is enough.
Have you got a lamp to try?
What is the load, resistive, capacitive, inductive?

Tom... :)
Everything runs on smoke, let the smoke out, it stops running....

Paul_KD7HB

Your relays come with one of three possible input voltages. Look on the case for the input voltage of your devices. Can be 5 volts, 12 volts or 24 volts. All have the identical mfg. number, according to the data sheet.

Paul

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