Siemens SINUMERIK 840Di sl Commissioning Manual page 455

Encoder limit frequency
If the sensor limit frequency in the following machine data is exceeded, synchronization of
the spindle is lost and spindle functionality is reduced (thread, G95, G96):
● MD36300 $MA_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 $MA_ENC_FREQ_LIMIT_LOW (encoder limit frequency at which the encoder
The encoder limit frequency value must be such that the mechanical encoder speed limit is
not exceeded or else the synchronization from high speeds will be incorrect.
Figure 11-30 Ranges of spindle monitoring functions/speeds
References:
/FB1/ Function Manual - Basic Functions, S1 Spindles, Chapter "Spindle Monitoring"
Manual
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
is turned on again).
NC Commissioning with HMI Advanced
11.5 Axes and spindles
455