[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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