Re: [Emc-users] Driving SSR's

[Javid B. <jav...@co...>]

What kind of questions do you have? It's pretty straightforward. Most of 
them have internal current limiting so you can drive them directly from a 
digital output. Measure your drive current to make sure you do not exceed 
the output of your 240's, but most of SSRs only need a few mA. It's a little 
better to common on the + side and pull the - input to the SSR low than to 
common the - side and drive the + input, because that usually means less 
heat generated in your driver.

I've been driving SSRs directly from output ports of PIC processors for 
years in a variable phase angle trigger for dimmers. If you use a 
zero-crossing SSR you don't even have to worry about sync to the line.

Javid


----- Original Message ----- 
From: "Kirk Wallace" <kwa...@wa...>
To: <emc...@li...>
Sent: Friday, June 22, 2007 2:30 PM
Subject: [Emc-users] Driving SSR's


>I am planning on using 74C240's at 12 Volts between a parallel port and
> my SSR's. Anyone have thoughts on driving SSR's?
>
> Kirk Wallace
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
> Download DB2 Express C - the FREE version of DB2 express and take
> control of your XML. No limits. Just data. Click to get it now.
> http://sourceforge.net/powerbar/db2/
> _______________________________________________
> Emc-users mailing list
> Emc...@li...
> https://lists.sourceforge.net/lists/listinfo/emc-users
>