Differential Speed Between Leading And Following Spindles - Siemens SINUMERIK 840D sl Function Manual

S3: Synchronous spindle
14.4 Special features of synchronous mode
Traverse keys for JOG (DB31, ... DBX4.6 and 4.7)
The "plus and minus traversing keys" for JOG are not disabled in the control for the FS in
synchronous operation, i.e. the FS executes a superimposed motion if one of these keys is
pressed.
Note
If superimposed traversing movements are to be precluded, they must be locked out by
measures in the PLC user program.
NC Stop axes plus spindles (DB21, ... DBX7.4)
"NC Stop axes plus spindles" in synchronous operation decelerates the coupled spindles in
accordance with the selected dynamic response. They continue to operate in synchronous
mode.
NC Start (DB21, ... DBX7.1)
See section "Configuration of the behavior with NC start".
Note
NC Start after NC Stop does not deselect synchronous operation.
14.4.4

Differential speed between leading and following spindles

When does a differential speed occur?
A differential speed develops, e.g. with turning machine applications, when two spindles are
opposite each other. Through the signed addition of two speed sources, a speed component
is derived from the leading spindle via the coupling factor. In addition to this, it is possible to
program the following for the following spindle:
● speed with S... and
● direction of rotation with M3, M4 or M5
The spindles can normally be synchronized by a coupling factor with the value '-1'. This sign
reversal then results in a differential speed for the following spindle as compared to an
additional programmed speed. This typical behavior in relation to the NC is illustrated in the
following diagram.
910
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions