Re: Servo Motor & Driver

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "weedytan" <weedytan@...>
wrote:>> Hi all,> > I was asked by a friend to look at a Taiwan made
ACRA Vertical NC Mill> (year 1996 or 1997) today wherein the
controller is dead and to find> out the feasibility of converting it
to a CNC using Mach3 or EMC. Here> are some details:> > 1) The servo
motor has a name plate that says: Special VR Motor made> by Servo
Products Co., Pasadena; Voltage - 350VDC; Torque - 115 in-lb>
(continuous); Current - 6 amp/phase; 3 phase; 3.2 Ohms/phase; 400 RPM

> 2) The servo driver board says ZD-6363 Rev I.
> 3) This is a 3-axis NC mill with 3 HP Induction Motor for the

spindle> controlled by a VFD.> 4) It wasn't in use for about 2 years
and it boot up Windows 98. After> which, it will not go into the
software controller.> > Since I am more used to Stepper tors/Drivers,
and totally ignorant> of Servo Motors, may I ask for some assistance
for the following:> > 1) How can I test without going thru the
controller if the servo > motors and/or servo drivers are still alive?

> 2) If the servo drivers are dead (most likely, as someone previously
> worked on it and gave up), what alternative servo driver can I use?
> 3) Is it advisable to use stepper motors/drivers to replace the

servo > motors/drivers in the same holding torque range? If not, and
if I need > to replace the servo motors as well, what newer model of
servo motors > and drivers can I use? Take note that the servo motor
has a continuous > torque of 115 in-lb (about 13 Nm or 1,840 oz-in).

> TIA for whatever info you can provide.> > WT>

I have one of this machine call supermax using servo2 control
Don't get mislead by the name "servo product" Actually the company
is called servo and don't have any actual servo product with them.
In the early days they made most of the power feed for Bridgeport
machines. "VR motor" is some kind of special stepper motor, When
travel rapid It roar louder that our normal stepper motor.
You will never going to use the motor and driver due to proprietary
parts.
Regards Jimsonchan