Siemens SINUMERIK 840Di sl Commissioning Manual page 452

NC Commissioning with HMI Advanced
11.5 Axes and spindles
Figure 11-29 Synchronization using BERO
When is synchronization necessary?
The spindle will be synchronized:
● after the NC has powered up when the spindle is moved using a programming command
● after a request for resynchronization by the PLC
● after each gear stage change for an indirect measuring system
● when the encoder limit frequency falls below the programmed value after a speed has
452
IS DB31,... DBX16.4 (resynchronize spindle 1)
IS DB31,... DBX16.5 (resynchronize spindle 2)
MD31040 $MA_ENC_IS_DIRECT (direct measuring system) = 0
been programmed which is above the encoder limit frequency.
NOTICE
The following is to be taken into account:
• To synchronize the spindle, it must always be rotated using a programming
command (e.g. M3, M4, SPOS). The specification of a spindle speed using the
direction keys of the machine control panel is not sufficient.
• If the spindle encoder is not mounted directly on the spindle and there are speed-
transforming gears between the encoder and spindle (e.g. encoder mounted on
motor), then a reference cam signal connected to the drive module must be used for
synchronization.
The control system then automatically resynchronizes the spindle after each gear
stage change. The user does not have to contribute anything here.
• In general, backlash, gearbox elasticity and reference cam hysteresis reduce the
accuracy achievable during synchronization.
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Manual