Re: Introduction

From your comments I take it that you can trip the relay with a 5 V
signal to the controller board.

Did you use a 5 V source from the controller board to do this?

Have you checked the grounds or return path between the PC and the SS
relay and/or controller board?

Have you measured the applied voltage to the SS relay inputs when using
the PC?

Hugh


David Johnson wrote:

>
> From: "David Johnson" <dcjohnsn@...>
>
> Hi, my name is Dave Johnson. A friend of mine asked to take a look at the
> list, so here I am. That friend is Tim Goldstein. I am in the process of
> building a cnc flame/plasma cutting machine. I am using Camtronics 5 amp
> controller and Desknc. Everything is moving accurately, but I am unable to
> trip a solid state relay for the cutting O2. I am getting a signal from the
> parallel port, but it must not be enough current to pull in the relay. I
> applied 5 volts from the logic portion of the controller board and measured
> the current. It only takes 7ma to pull in the relay. Any suggestions on
> how to pull in the relay from the signal on the parallel port? I am not an
> electronic genius, so the simpler the better.
>
> Thanks
>