Siemens SINUMERIK 840D Function Manual page 776

S1: Spindles
18.4 Configurable gear adaptations
MD35010 $MA_GEAR_STEP_CHANGE_ENABLE
Bit
0
1
3
5
Requirement for a gear stage change
In principle, the gear stage change is only performed if the requested gear stage is not the same
as the active gear stage.
Parameter set selection during gear stage change
The servo parameter set is also changed over with the gear stage if:
MD35590 $MA_PARAMSET_CHANGE_ENABLE = 0 or 1
For further information, see Section "Parameter set selection during gear step change
(Page 789)".
776
Value Meaning
0 The spindle motor is attached to the spindle directly (1:1) or with a non-variable trans‐
mission ratio (basic setting).
The machine data of the first gear stage is effective.
1 Spindle motor with up to five gear stages.
The gear stage change takes place:
● In oscillation mode
● At indefinite change position
0 Meaning as in Bit 0 = 0.
1 Meaning as in Bit 0 = 1, however, the gear stage change takes place at the configured
spindle position.
The change position is set in machine data:
MD35012 $MA_GEAR_STEP_CHANGE_POSITION
The position is approached in the current gear stage before the gear stage change.
If Bit 1 is set, then Bit 0 is ignored!
1 The gear stage change dialog between NC and PLC is simulated.
1 The second gear stage data set is used while tapping with G331/G332 (see the following
paragraph "Second gear stage data set"). The bit must be set for the master spindle
used during the tapping.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA