RE: [CAD_CAM_EDM_DRO] Help retrofitting

Ubaidullah,

For each axis there is an entry called BIAS. This adds or subtracts a small
offset to the dac output.

FF2 can have a similar effect depending on amp configuration.


That being said I do not think a small offset would cause the system to
slowly creep.
This is a closed loop system....if any offset tried to cause a slow movement
the encoder would detect the error in motion and do whatever is required to
correct it.

Usually a creep like that would be caused by noise in the encoder line. Are
your encoders
wired in differential mode? They should be. For an encoder with index there
should be eight wires.
If no index there will be six wires. If there are fewer than this they are
being run single ended
and are very prone to noise. This can be corrected by fitting a simple
inexpensive quad differential
line driver near the encoder.

There are a few other possibilities, but I do not know enough about your
amplifier configuration
to speculate about them.

Les


Leslie M.Watts
L M Watts Furniture
Tiger Georgia
(706) 212-0242

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-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com]On Behalf Of Babar
Sent: Wednesday, May 04, 2005 5:28 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: RE: [CAD_CAM_EDM_DRO] Help retrofitting


Dear Les,

Can you please guide me where in ini I can enter the
Offset value?

Since I don't have the data /manual of the drive there
fore I don't know about the mode of operation of these
drives i.e either Velocity or Torque Mode

Best Regards

Ubaidullah Babar

--- Leslie Watts <leswatts@...> wrote:

> Hi Babar
>
> You can put in an offset in the .ini to counter this
> rotation,
> but you shouldn't have to. Are the amps running in
> velocity or torque mode?
>
> Les
>
> Leslie M.Watts
> L M Watts Furniture
> Tiger Georgia
> (706) 212-0242
>
> Main page:
> http://www.lmwatts.com
> Engineering:
> http://www.lmwatts.com/shop.html
> Cnc surplus for sale:
> http://www.lmwatts.com/forsale.html
> Carved signs:
> http://www.lmwatts.com/signwp.html
>
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com]On Behalf Of
> Babar
> Sent: Friday, April 29, 2005 2:47 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com;
> ubaid72@...
> Subject: [CAD_CAM_EDM_DRO] Help retrofitting
>
>
> Dear Friends,
>
> I am retrofitting a Bridgeport Milling with EMC and
> STG-II,
> The old controller is Heidenhain 151 and the DC
> servo
> Drives are Bosch Z15-1-240V.
>
> The problem I am facing is that when the drives are
> enable by STG II they start rotating due to some
> residual/offset voltage due to which EMC shows the
> following error and disables the drives.
>
> So I need to adjust the pots on Drive so that the
> motor does not rotate without any signal from STG
> II.
> But since I don't have the Manual of these drives I
> don't know how to adjust.
>
> Does anybody have some solution for this?
>
> regards
>
> Babar
>
>
>
>
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