New to MESA

There is a 5volt terminal specifically for 5 volt logic the 7i76 needs.
Seperate to that is the field power connector (orange terminal strip).
Leaving the default jumper, whatever you put on vin and ground will be for your field power. Re: inputs and outputs.
If you place the jumper to the right, you can provide vin a voltage (8 -32v), and a different voltage for the field output.
So you can supply three different voltages to the 7i76 if you like.

Thank you guys, really helpful. I am about to install the 5i25 as I received the cards today and then I'll be able to visually see whats available to me!

racedirector wrote:

Thank you guys, really helpful. I am about to install the 5i25 as I received the cards today and then I'll be able to visually see whats available to me!

Awesome, great to see another Aussie to the Mesa ecosystem. Prepare to be surprised with the performance you will get out of your steppers! My maximum expected RPM doubled....

Really looking forward to that aspect, I can actually run at 1000ipm now (and that is bloody scary!!) but expect things to be smoother. Hoping it is like going from Mach 3 to Linuxcnc only better

If you need really small power only for some switches or an electronic Handwheel, than you can simply misuse the connector P3 in the bottom left of the board, or maybe better you take one of the 5V + ground connectors from one of the stepper or the encoder connector.

I think I stuffed my 7i76!

Made up a cable with 25 pin IDC connectors to get the 7i76 outside my control box. When I plugged it in the 7i76 had some smoke escape and it looks the the U9 chip was the culprit. Anyone know what U9 is used for on the card and if, by chance, the card is still usable? If not can they be repaired because if not it was an expensive bloody cable stuff up.

Yes, if you happened to build the cable with one connector reversed and set up the
5I25/6I25 to supply 5V power to the 7I76, U9 and U12 could be damaged

We can fix this, just request RMA # from Mesa

Thanks PCW, I'll get in contact for an RMA.

Tommy, I think the IDC spikes went wrong, whatever power is coming from the parallel cable is what went through U9 for a split second.

Anyway, I have ordered another one from JT on speedy postage so hopefully that will now arrive next week.

I'll send this one back to Mesa and when that comes back will buy another 5i25 and put it into the other CNC I am putting back together.... or maybe use the combo in my lathe.....

Wow, JT's service is beyond outstanding, I bought my replacement this afternoon and he has already shipped it. Can not recommend his service enough!