[Emc-users] Drive options with 7i76

[Marius Liebenberg]

Hi

I have to replace my lathe drive and the one I have does not have a 10v
source for the 7i76 card produce the 0 - 10v signal.


Is there a clever way to drive this with with 7i76.



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Regards / Groete

Marius D. Liebenberg
[phone]
[phone]


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[Gene Heskett]

Post by Marius Liebenberg
Hi
I have to replace my lathe drive and the one I have does not have a
10v source for the 7i76 card produce the 0 - 10v signal.
Is there a clever way to drive this with with 7i76.

My imitation 1.5 horse vf drive has a 5 volt range input. Not tested but
its there, perhaps yours does too? In which case a 5 volt swing from a
cmos output might work well.

Most any 10 to 12 volt rated "wall wart" power supplies that is truly
isolated can be used, maybe even one labeled 9 volt since the current
draw is under 10 mills will work. 12 volt regulated would be a plus but
if its pid driven with encoder feedback, not a hard requirement.

Post by Marius Liebenberg
-----------------------------
Regards / Groete
Marius D. Liebenberg
[phone]
[phone]
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Cheers, Gene Heskett

[andy pugh]

Post by Marius Liebenberg
Is there a clever way to drive this with with 7i76.

Possibly with a DC boost converter. Do you have 10V anywhere else?

[Gene Heskett]

Post by andy pugh

Post by Marius Liebenberg
Is there a clever way to drive this with with 7i76.

Possibly with a DC boost converter. Do you have 10V anywhere else?

Most of those, step up or step down, have a common neutral on both sides.
I don't know if the OP's smoke alarm is fast enough. Thats why I put
some emphasis on the "isolated" in my previous reply.


Cheers, Gene Heskett

[Marius Liebenberg]

Post by andy pugh

Post by Marius Liebenberg
Is there a clever way to drive this with with 7i76.

Possibly with a DC boost converter. Do you have 10V anywhere else?

No not at all. I was wondering if I could use a voltage divider to bring
the 24v down to 12v at least as the 7i76 spindle drive will work up to
15v.
The 7i76 spindle drive emulates a pot that can handle up to 15v

Post by andy pugh
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916
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[andy pugh]

No not at all. I was wondering if I could use a voltage divider to bring the
24v down to 12v at least as the 7i76 spindle drive will work up to 15v.

I think I would prefer to use a DC to DC converter (an isolated one,
so that you are not tying VFD GND to field-IO GND) but a voltage
divider would probably work.

Something like: http://uk.rs-online.com/web/p/isolated-dc-dc-converters/1226849/