Siemens SINUMERIK 840D sl Function Manual page 787

Resynchronize spindle 1/2 (DB31, ... DBX16.4 and 16.5)
The IS "Resynchronize spindle 1/2" (DB31, ... DBX16.4/16.5) are not locked. Any positional
offset is not compensated automatically by the coupling.
Invert M3/M4 (DB31, ... DBX17.6)
IS "Invert M3/M4" (DB31, ... DBX17.6) only inverts the additional programmed speed
component for the following spindle.
The motion component generated by the synchronous spindle coupling remains unaffected.
Spindle override (DB31, ... DBB19)
The "Spindle override" VDI interface (DB31, ... DBB19) only affects the additional programmed
speed component for the following spindle. If the spindle override switch is transferred to all
axial inputs, then any change in the spindle override value is applied twice to the following
spindle:
● once indirectly by a change in speed for the leading spindle and
● once in the programmed component of the following spindle.
The offset value can be adjusted accordingly in the PLC program.
Deselecting the coupling
If the coupling is deactivated, the following spindle continues to rotate at the speed
corresponding to the sum of both speed components. The motion transition upon coupling
deselection is at continuous speed.
With COUPOF , the spindle behaves as if it had been programmed with the speed and direction
transferred from the other spindle. In the example, this would be M4 S400.
When COUPOFS is programmed, the following spindle is decelerated to standstill from the
current speed.
Activate additional functions
The following spindle can also be a master spindle. In this case, it is capable of additional
functions.
● Rotational feedrate with G95, G96 and G97. With G96 S2=... the "constant cutting speed"
can be activated for the following spindle.
The speed dependent on the position of the transverse axis is the setpoint speed for the
speed interpolator of spindle 2 and is therefore included in the total speed of S2.
● Rigid tapping without compensating chuck with G331, G332.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
S3: Synchronous spindle
14.4 Points to note
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