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!
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.
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.
int ssrControlPin = 30;
void setup() {
// initialize the digital pin as an output.
pinMode(ssrControlPin, OUTPUT);
digitalWrite(ssrControlPin, LOW); // set the SSR on
}
void loop() {}
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.
int ssrControlPin = 30;
void setup() {
// initialize the digital pin as an output.
pinMode(ssrControlPin, OUTPUT);
digitalWrite(ssrControlPin, LOW); // set the SSR on
}
void loop() {}
Does setting output LOW supposed to activate the SSR?
Forget Eagle, use pen/paper and photograph your drawn circuit.
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...
Tom, I'm flipping a 25W led panel lamp. I tried LOW and HIGH, but only the LOW makes the led on the SSR to light up. I have also tried 4x 25W led panel lamps (100W, almost 1A), nothing happens.
Are you saying on a 2A capable relay, I need a current larger than 10% of its capacity to flip it?
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
Paul, I tried with 5V and 17V (both with reliable external power sources capable of 5A), nothing does the trick...
