On Fri, 24 Jan 2020, Brent Loschen wrote:
Date: Fri, 24 Jan 2020 14:00:06 -0700
From: Brent Loschen <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: [Emc-users] Question regarding power requirements for 7i76 Spindle+
and Spindle-
I currently power a 7i76 from the 5i25/cable, and am wondering if it's
OK to power the Spindle + and - (TB4 pins 1 and 3) using that 5v source,
or if it requires a separate 5v supply? If current draw from the cable
is no problem, are there any other drawbacks to using that 5v source?
(i.e. noise, stability, etc.) And finally, Spindle + and - pins appear
to be isolated from the rest of the card, and it seems like I should
connect Spindle - to 5v neutral regardless of which 5v I use. Do I have
that right? (it will be connected to a VFD with 0-5 input requirement)
Thanks,
Brent
VFD Spindle drives are often very noisy so its much better to use their
10V potentiometer power if possible, next choice is a floating 5V or 10V supply
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Peter Wallace
Mesa Electronics
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