RE: [CAD_CAM_EDM_DRO] High Voltage servo cards

I knew you had some Jon, and Yes we have discussed this many times.

I didn't know these were yours, I thought you kept them for your own use
because they were expensive.

I was hoping you would come in with a suggestion, seems you've already
experienced every problem the rest of us have which means you've had good
chance correct them.

I also get a good honest answer from you all the time.



Your PWM board, I take it that takes normal Step Direction signals in from
parallel port, so I could run it from My G100.

What max frequency step rate can you take in, though if its like your
encoder rate at 300KHz it will be OK.

My motors are SEMMT30U4-57's,

57V/1000PM, 140V but I have a 160V supply which SEM say is still OK,

40lB/in TENV stall torque, at 8.3 amps without forced cooling.

Peak stall talk 192lb/in at 47 amps, Armature 1.1 Ohm less brushes, 8.1mH

Do you see any problems here.



Lastly you have a price for the motion PCB at $250, what price are the servo
cards, and I suppose shipping to the UK.



I'll have a good look at all the data on your site tomorrow.

Regs Mark



Dr. Mark Vaughan Ph'D. B.Eng. M0VAU

Managing Director

Vaughan Industries Ltd, reg in UK no 2561068

Water Care Technology Ltd, reg in UK no 4129351

Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288

RSGB DRM111(Cornwall)

_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Jon Elson
Sent: 01 April 2007 18:03
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] High Voltage servo cards



Mark Vaughan wrote:

> Hi Guys
>
> I'd like to ask what other HIGH VOLTAGE servo cards are some of you are
> using.
>
> I've just lost another Rutex which has gone noisy, grunchy motor control,
> and gaining steps, change the card and it's OK so must be a bad card.
>
> The PID control on the Rutex is brilliant, but they suffer from noise,

which

> I've just about got a handle on, and seems have a few other weaknesses.

Well, please excuse me for tooting my own horn here, but my PWM
servo amplifiers can run at voltages well above what a Gecko can
handle. I haven't run them much over 120 V yet, but the design
was made for up to 160 V with plenty of margin left. What
voltage and current do you need?

My servo amps have output filters in them, so the motor wires do
not radiate interference that could contaminate encoder signals.
That has never been a problem when using my amps. These filters
also reduce circulating high-frequency currents, allowing the
motors and the amps themselves to run a lot cooler.

See <http://jelinux. <http://jelinux.pico-systems.com/pwmservo.html>
pico-systems.com/pwmservo.html> for more info.

These are not step/direction servos like Gecko and Rutex, so
they need a controller capable of generating the PWM signals.
See <http://jelinux. <http://jelinux.pico-systems.com/univpwm.html>
pico-systems.com/univpwm.html> for info on
my controller for these amps.

Jon





[Non-text portions of this message have been removed]