Mesa 7I76e - Two power supplies or one?

txtrone
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10 Nov 2020 00:09 #188826 by txtrone

Mesa 7I76e - Two power supplies or one? was created by txtrone

I noticed the 7I76e can be powered using both 24v and 5v ... is that recommended? I have it powered using 5v only at the moment, nothing besides my PC connected. Just curious what the normal setup is? I will be using this card for a plasma table.

Thanks

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Benb
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10 Nov 2020 02:54 #188838 by Benb

Replied by Benb on topic Mesa 7I76e - Two power supplies or one?

you need 5v and 24v PS. The following link contains wiring diagrams that might help you.
forum.linuxcnc.org/27-driver-boards/3191...nnection-sheet#83565

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PCW
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10 Nov 2020 03:07 #188839 by PCW

Replied by PCW on topic Mesa 7I76e - Two power supplies or one?

You can use 5V and 24V or a single 24V supply.

There is also the option of using separate field and FPGA logic power
if you want isolation between the FPGA section and the field I/O section

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rodw
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10 Nov 2020 08:12 #188845 by rodw

Replied by rodw on topic Mesa 7I76e - Two power supplies or one?

txtrone wrote:
I have it powered using 5v only at the moment, nothing besides my PC connected.
Thanks

While its not necessary, I run seperate 5V and 24V power supplies. I think next time, I would just use the 24V power supply.
I would just add 24V field power to what you have now. You don't need a big power supply. Around 2 amps is fine.

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txtrone
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10 Nov 2020 13:09 #188867 by txtrone

Replied by txtrone on topic Mesa 7I76e - Two power supplies or one?

Ok, I will add 24V ... there is a jumper I need to change to run both 5v and 24v, at least I am pretty sure I read that somewhere. I will check the manual.

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txtrone
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10 Nov 2020 23:24 #188937 by txtrone

Replied by txtrone on topic Mesa 7I76e - Two power supplies or one?

If using 24v only, should I use the same 24v PS to provide power to the TB1 field power AND TB3? Or do I need to somehow separate that incoming power? Or have it coming from two sources?

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PCW
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10 Nov 2020 23:33 #188940 by PCW

Replied by PCW on topic Mesa 7I76e - Two power supplies or one?

Normally I would just use one power supply unless you want the field
I/O section to be isolated for noise reasons.

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txtrone
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10 Nov 2020 23:49 #188943 by txtrone

Replied by txtrone on topic Mesa 7I76e - Two power supplies or one?

PCW wrote:
Normally I would just use one power supply unless you want the field
I/O section to be isolated for noise reasons.

Ok, but does the one power supply need to connect at both TB1 and TB3? The way that the 'Anschluss' drawing shows? Or am I misreading the schematic? Relevant portion attached.

Thanks!

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PCW
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11 Nov 2020 00:46 #188944 by PCW

Replied by PCW on topic Mesa 7I76e - Two power supplies or one?

Yes you would need to connect to TB1 (Field Power) and TB3 (unregulated logic power for the FPGA side)

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txtrone
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11 Nov 2020 00:52 #188945 by txtrone

Replied by txtrone on topic Mesa 7I76e - Two power supplies or one?

Thanks! I flipped the switch and no smoke!

The following user(s) said Thank You: rodw

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Mesa 7I76e - Two power supplies or one?

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