Siemens SINUMERIK 802D sl Function Manual page 352

Spindle (S1)
20.3 Synchronization
● In JOG mode the spindle is started in speed control mode with the direction keys and
Value acceptance
When synchronizing the spindle, the associated reference point from MD34100
REFP_SET_POS[0] (default value = 0) is transferred and a possible shift of the reference
point. These shifts (machine data) act irrespective of the connected measurement system
and are described in Chapter "Reference Point Approach (R1)".
Maximum encoder frequency exceeded
If the spindle speed reaches a speed (large S value programmed), which exceeds the
maximum encoder limit frequency MD36300 ENC_FREQ_LIMIT (the maximum mechanical
speed limit of the encoder must not be exceeded), the synchronization is lost. The spindle
continues to rotate, but with reduced functionality.
If a speed is then reached that is below the encoder limit frequency in MD36302
ENC_FREQ_LIMIT_LOW (% value of MD36300), the spindle automatically synchronizes
with the next zero mark signal. You can achieve this by programming a lower S value,
changing the spindle speed override switch, etc.
Re-synchronizing
In the following case, however, the position measuring system must be re-synchronized:
the position measurement encoder is on the motor, a BERO (distance sensor for
synchronization signals) is mounted to the spindle and the gear stage is changed. The
synchronization is triggered internally when the spindle is rotating in the new gear stage.
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synchronizes with the next zero mark of the position measurement system or the BERO
signal.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0