On Sun, 29 Dec 2019, andrew beck wrote:
Date: Sun, 29 Dec 2019 23:19:20 +1300
From: andrew beck <andrewbeck0...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] looking for advice on best wiring practices and
grounding on cnc mills
SNIP---------------------------------
and the brake switching system needs a relay I think. a contact opens in
the drive at whatever timing I set with parameters and that contact will
run another contact cutting the 24 volt power to the brake solenoid. I
wasn't actually using that. I just had the brake locked open all the time
while I was testing. I already had the X and Y axis working fine and was
just connecting up the Z axis when everything went downhill.
If you switch the brake magnet circuit with a relay, You _must_ have a
flyback diode across the brake magnet coil or you will have arcing
at the relay contacts and generate massive amounts of EMI when the brake is
released...
On Thu, Dec 26, 2019 at 11:53 PM Andy Pugh <bodge...@gmail.com> wrote:
> On 26 Dec 2019, at 06:49, andrew beck <andrewbeck0...@gmail.com> wrote:
>
> That meant that the brake actually had a lot more than 24 volts in
> it relative to machine earth(like 200v I am guessing, it was a big bang!)
That shouldn??t normally matter. I would be very surprised if the brake
winging insulation wasn??t good for 24V.
I think you should check the brake, make sure that it isn??t leaky. Does
your electrician have an insulation tester?
Is frame ground also a zero-volt reference for logic and field wiring? You
sound to be using the terms semi-interchangeably.
What is the brake switching device in the drive?
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Mesa Electronics
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