I had to read a few times..........but yes, I think I understand the
principals now. Thank you.
I have revised my schematic now and hopefully have the caps in the
correct place. I've also added the 'pull-ups' that Jon suggested.
https://www.purbrookengineering.com/index.php?option=com_content&view=article&id=11
Pete
On 09/10/2021 20:45, John Dammeyer wrote:
The caps go between pin 8 and 5 for each device. The 10uf just where the 5V
comes into the board..
This drawing may clarify it a bit. In North America the 220VAC is split phase
to provide 110VAC to a neutral. In the case of systems that use 22VAC and
110VAC they often provide the black, white, red and bare wire ground
connection. On my mill I have only the black and red and bare wire (green with
yellow stripe) like the European Blue/Brown/Green.
Any 110VAC is created with a step down transformer. The Earth is the bare wire
(green with yellow stripe) that is ultimately connected to a ground post or
plate buried in the earth. As others have said, that becomes the single point
Frame Ground. Usually done with a bolted post to bare metal and all other
mechanical units have a wire from their frame to this point rather than relying
on bolted mount connection for continuity. But only one place in the entire
machine/control system should be connected to the breaker panel earth.
So in my case, not shown on the drawing, the Bergerda AC Servo drives require
220VAC and have a metal heatsink with two screws. One for the shield for the
power cable to the motor and one for the green/yellow wire in the power cable.
Those run back to the AC Power Distribution as the 3rd prong where it
ultimately goes to the same bolt that goes to Earth in the breaker panel.
Make sense?
John
-----Original Message-----
From: Peter Hodgson [mailto:peterjohnhodg...@gmail.com]
Sent: October-09-21 12:22 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Fwd: Rogue Index Pulses
Hi John,
Thanks for sharing the drawing. Yes, I would like to get things properly
drawn when I get the time.
In the mean time....... would you mind having a quick look at the
revised schematic on the following link to check I have placed the
capacitors you suggested in the correct place when using the HCPL2631 ??
https://www.purbrookengineering.com/index.php?option=com_content&view=article&id=11
I notice on your drawing you have 'Earth' and FGND. What's the difference?
Pete
On 09/10/2021 18:18, John Dammeyer wrote:
Hi Peter,
I find it helps to draw a wiring diagram of where things are wired. That�s
different from a schematic which just shows how things
are connected.
For example, I've attached the old schematic of my mill wiring (before I
removed the two HP-UHU drives and wired in the
quadrature encoder for the spindle into the second Chinese BoB). Note to self:
Really must update now that I have AC servos on
everything.
I have colour codes on there for wiring. But it does not show the actual
wiring paths. For example the 24V comes out of the
Power Supply and splits in two directions. One to the DIN Rail for the
MiniBoB->STMBL drive, the STMBL drive and 24V-16V UHU
power supply. From there another DIN rail set of terminal blocks to run power
out to the Bergerda Spindle Interface and now the
Bergerda interface boards.
But the drawing doesn't actually show the DIN rails or wire lengths so there's
no way to see if the 24V system has ground loops etc.
Not from the Schematic.
So I still have to create a new 'mechanical' wiring diagram that shows where
rather than how things are connected.
John
-----Original Message-----
From: Peter Hodgson [mailto:peterjohnhodg...@gmail.com]
Sent: October-09-21 1:38 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Fwd: Rogue Index Pulses
Thanks Chris, yes, I will change the shielding ground to the controller end and
isolate the case.
Is it best practice to run the 5v and 12v ?grounds? back to the original 24v
power supply 0v?
On 9 Oct 2021, at 00:53, Chris Albertson <albertson.ch...@gmail.com> wrote:
?I'll say what Gene said. I'd bet on a groubing issue. The schmatic has an
error, a groubd wire ismissing and also shows random crossing grounds.
Run everything back to the power supply minus post.
Also you be much better if the sheild was grounded to the controller end.
Never us a machine and it's mounting bolts as grounds.
--
Chris Albertson
Redondo Beach, California
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