So the FPGA would not be able to handle sinking 12 mAmps at 12 Volts? In other words, I would like to wire a 12 Volt supply to all of the SSR + inputs. Then wire each SSR - input to each FPGA sink socket on the controller card.
On Sun, 2007-07-08 at 23:01 -0500, Jon Elson wrote: > Kirk Wallace wrote: > > Jon, > > > > I would like to wire the existing SSR's to my UnivPWM controller. The > > thing is, that their inputs where running at 12 Volts. They are rated > > for 3-32 Volts, they seem to work fine on 5 Volts, but if the controller > > can sink 12 mAmps at 12 Volts, I would like to go that way. If you know > > off hand the specs on the SSR ports, Please let me know. Thanks. > Yes, the outputs for SSRs can easily drive 12 mA. There is an > LED in series with +5 V to one of the SSR pins, the FPGA drives > the other control pin. So, the FPGA grounds that pin to turn on the > SSR. If you need more voltage swing, you could wire the + > terminal of the SSR to the +5 V output of the UPC board, and the > - pin to the SSR control pin on the IPC. The indicator LED > wouldn't work in that case. But, if your SSR's say they are > good down to 3 V at the input, you should be able to use them > without any special provisions. I don't provide any series > resistor in the circuit as the SSRs provide that. > > Jon ------------------------------------------------------------------------- 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
