Siemens SINUMERIK 840D sl Function Manual page 1636

Detailed Description
2.1 Spindle modes
Phase 2
Case 1: Spindle not synchronized
When the spindle is synchronized, position control is activated.
The spindle rotates at the maximum speed stored in machine data:
MD35300 $MA_SPIND_POSCTRL_VELO
until the braking start point calculation identifies the point at which the programmed spindle
position can be approached accurately with the defined acceleration.
Case 2: Spindle synchronized
To reach the end point, the spindle is accelerated up to the speed defined in machine data:
MD35300 $MA_SPIND_POSCTRL_VELO.
This is not exceeded.
The braking start point calculation identifies when the programmed spindle position can be
approached accurately at the acceleration defined in machine data:
MD35210 $MA_GEAR_STEP_POSCTRL_ACCEL.
At the time identified by the braking start point calculation in phase 1, the spindle brakes to
standstill with the acceleration from machine data:
MD35210 $MA_GEAR_STEP_POSCTRL_ACCEL
.
Phase 3
At the point, which is determined by the braking start point in Phase 2, the spindle
decelerates to stillstand with the acceleration from the following machine data:
MD35210 $MA_GEAR_STEP_POSCTRL_ACCEL
.
Phase 3a:
When the SPOS command is activated the proximity of the end point is such that the spindle
can no longer be accelerated up to machine data:
MD35300 $MA_SPIND_POSCTRL_VELO.
The spindle is decelerated to standstill with the acceleration from the following machine data:
MD35210 $MA_GEAR_STEP_POSCTRL_ACCEL
.
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Basic logic functions: Spindles (S1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0