Re: [CAD_CAM_EDM_DRO] Need to upgrade controls

In a message dated 7/14/2004 5:25:35 PM Eastern Daylight Time,
terrygh@... writes:

Hello all, I hope some of you can help me with this project.
I have two YCI cnc mills circa 1980 using Bandit controls,
with level 3 firmware. I would like to upgrade both controls to
something newer, these machines both have 400 oz-in servo motors
rated at 80 vdc with tach feedback and resolves. I would like to
retain the servo motors, the power supply and the driver boards. The
reason being the tach feedback which is, 3vdc per 1000 rpm, is
connected to the driver board for a closed loop torque feedback.
From reading the setup information for the driver board it seems that
the driver signal voltage is +/- 10vdc.
The resolves are connected to the Bandit resolver logic board
and are driven off the back of the servo motors. The resolver
information I have is, Summit Engineering Corp., Bozeman Mt., 2500hz,
rotor phase 1 output 5.0 volts, stator 2 phase input 12 volts. These
will probably have to be upgraded to new encoders that will work with
the new control software
Both mills have 3 phase 220vac Dana Condor spindle drives that are
controlled via the Bandit. This drive uses an analog input signal
for speed control and relay logic for spindle direction. I would
also like to retain these spindle drives if possible.
I have all the prints for the Bandit control, the set up
procedure for the driver boards, along with prints for the Condor VFD.
I would like to control these machines with my notebook
computer it has parallel, serial and usb2 ports.
If anyone has any information which would help me upgrade
these machines I sure would appreciate it.

Thanks Terry Huntington



Terry:

I know you want to spend as little as possible but what price range are you
looking to work within? Take a look at Fagor Controls. They have them for a
few thousand dollars each that should handle what you have except for the
resolvers since not too many people use those anymore with DC servos. Almost
all of the off the shelf proprietary controls like Fagor, Fanuc, NUM, etc.
will drive your spindle, no problem and will also drive the DC servo motor
drives. Pretty much the standard for servo control, AC or DC is +/- 10 Vdc.

However, there are other, less expensive options but not quite as reliable,
if you are using this machine on a day to day 8 to 12 hours per day production
type of operation. For that I would recommend going with one of the proven
controls.

Hope this helps some.

Randy Abernathy
4626 Old Stilesboro Road NW
Acworth, GA 30101-4066
Phone / Fax: 770-974-5295
Cell: 678-772-4113
E-mail: Cnc002@...

I furnish technical support, repair, and other related services for your
industrial woodworking machinery. My background as Senior Service Engineer for
the SCMI Group for nearly fifteen years with factory training, combines with
my extensive background in electronics, mechanics, pneumatics, electrical and
CNC machinery to offer you needed support for your machinery.


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