Siemens SINUMERIK 840Di Function Manual page 1518

Detailed Description
2.1 Spindle modes
Fig. 2-2
Note
The speed from machine data:
MD36302 $MA_ENC_FREQ_LOW
must be greater than the position-control activation speed
(MD35300 $MA_SPIND_POSCTRL_VELO).
Phase 1
Possible positioning from Phase 1a:
The spindle is rotating at a higher speed than the encoder limit frequency. The spindle is not
synchronized.
Possible positioning from Phase 1b:
The spindle is rotating at a lower speed than the encoder limit frequency. The spindle is
synchronized.
Note
If position control is active, the speed can only amount to 90% of the maximum speed of the
spindle or the encoder limit frequency (10% control reserve required).
2-14
Positioning from rotation
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Spindles (S1)