Siemens SINUMERIK 840D sl Programming Manual page 931

Differential speed
A speed difference results in speed control mode and active synchronous spindle coupling
through signed overlay of an FS speed because of LS movement and an FS speed because of
spindle programming:
● Synchronous spindle coupling with COUPONC
● S<FS>=<speed> [M<FS>=<direction of rotation>]
Note
Supplementary conditions
● Speed S... must also be reprogrammed with direction of rotation M3/M4.
● Overlay of a spindle speed (M<direction of rotation> S<FS>) through the LS
● The dynamic responses of the leading spindle have to be restricted to such an extent that
Additional information about differential speed, see:
Additional information
Function Manual Axes and Spindles
Velocity, acceleration: FA, ACC, OVRA, VELOLIMA
Axial velocity and acceleration of a following spindle can be programmed with:
● FA[SPI(S<n>)] or FA[S<n>] (axial velocity)
● ACC[SPI(S<n>)] or ACC[S<n>] (axial acceleration)
● OVRA[SPI(S<n>)] and OVRA[S<n>] (axial override)
● VELOLIMA[SPI(S<n>)] and VELOLIMA[S<n>] (increase and reduction of axial velocity
respectively)
With <n> = 1, 2, 3, ... (spindle number of the following spindles)
Further information
Feed control (Page 105)
Note
A reduction or increase of the maximum axial jerk has no effect with spindles.
Additional information about the dynamic performance of axes is provided in:
Additional information
Function Manual Axes and Spindles
Programmable block change behavior WAITC
WAITC can be used to define block change behavior, for example after a change to coupling
parameters or positioning actions, with a variety of synchronism conditions (coarse, fine,
IPOSTOP). If no synchronism conditions are specified, the block change behavior specified in
the COUPDEF definition will apply.
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
movement with synchronous spindle coupling COUPONC only becomes effective if the
overlay has been enabled.
when overlaying is applied to the following spindle, its dynamics limit values are not
exceeded.
Work preparation
3.16 Axis couplings
931