Trying to fit 2 MPG

[keith wainwright]

The boards are powered by a 24 volt power source but also have a 5 volt usb input . So clive are yours wired in any way diferent from mine.

[Ger21]

The boards are powered by a 24 volt power source but also have a 5 volt usb input . So clive are yours wired in any way diferent from mine.

So you do have a 24V supply connected to the board? If not, the inputs do NOT work.

[keith wainwright]

Yes 24 volts to both boards . All the other inputs work because the machine works fine . I am going to check diagnostics now

[Clive S]

Yes 24 volts to both boards . All the other inputs work because the machine works fine . I am going to check diagnostics now

How have you wired them? Did you put a current limiting resistor in series ?

[keith wainwright]

Yes I put one end in the bob and the wire to the other tail on both A and B

[Clive S]

You could of maybe mentioned that in your previous post

I don't see why as I gave the correct info to do the job.

OK
a) connect 8-12 V to the bob centre two terminals near the blue relay
b) connect 5 V or the USB to the bob
c) connect 5 V to the mpg + & - and A & B to input pins via a 1k resistor pins 10 and 11 (or any of the inputs)

Job done , You will have to set the pins up and high/low in Mach3. I used Linuxcnc
you might have to change the sense of the pins in Mach3 I used Linuxcnc

Edit : If you need to use the bob to drive the VFD (0-10v) you need to power the BOB with at least 12V
but if you don't need that the MPG will work with just 5V connected to the same pins at a) above