It seems you don't know how a thyristor or a triac works.
If you supply A-K ( thyristor ) or A1-A2 ( triac ) ( A = anode, K =
cathode ) in DC the AK or A1-A2 junction will stay on after a gate or opto
command until the currrent through this junction will go to zero ( in fact
must be less than sustain current) and this will never hapened in DC .
Use a bulb for test and supply it in AC. Will works.
Cheers, Vasile


On Thu, 2 Aug 2001, Nick Veys wrote:

> Hi all, I'm using an Omron G3MB-202P solid state relay, 5V flavor.  It's
> a phototriac.  It's not behaving how I would expect though, hopefully
> someone can clear this up..
>
> Pin definitions:
>
> 1 - load
> 2 - load
> 3 - (+) input
> 4 - (-) input
>
> Here's what I am seeing:
>
> Connections:  to test this I just want to light an LED...
>
> 5V to Anode of 5V LED
> pin 1 - cathode of LED
> pin 2 - ground
> pin 3 - ground
> pin 4 - ground
>
> This is how I start it up.
>
> Now when I apply power to this, of course nothing happens as I expect.
> I then switch over the pin 3 to +5V, the LED lights, as expected, I then
> switch the pin 3 back to ground, the led stays lit.  In fact, no
> arrangement of the input pins (3,4) will make the damn LED shut off, I
> can't break the circuit once it's made...  Doesn't sound too useful of a
> relay!
>
> Hopefully I'm doing something obviously wrong!!
>
> I've tried this with 3 different relays so I doubt they are defective...
>
> Someone please smack me and tell me the simple solution! :)
>
> Thanks all!
>
> -- Nick
>
> nick@veys.com | www.veys.com/nick
>
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