Siemens SINUMERIK 840D sl Commissioning Manual page 181

Programmed Spindle speed limitations
The following functions can be used to specify a spindle speed limitation in an indexing
program.
● G25 S... (min. spindle speed)
● G26 S... (max. spindle speed)
The limitation is active in all operating modes.
The following function LIMS=... can be used to specify a spindle speed limit for G96
(constant cutting rate):
● LIMS=... (speed limitation (G96))
This limitation is only active when G96, G961 and G97 are active.
Encoder limit frequency
If the sensor frequency in the following machine data is exceeded, synchronization of the
spindle is lost and spindle functionality is reduced (thread, rotational feed, constant cutting
speed).
● MD36300 ENC_FREQ_LIMIT (encoder limit frequency)
The spindle will be re-synchronized automatically once the sensor frequency falls below the
value defined in the following machine data:
● MD36302 ENC_FREQ_LIMIT_LOW (encoder limit frequency at which the encoder is
Sensor frequency must be entered such that the sensor will not be destroyed mechanically
(e.g. by too high speed).
IBN CNC: NCK, PLC, drive
Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
turned on again).
10.6 Parameterization of spindle data
NCK start-up
181