Siemens Sinumerik 840DiE sl - Page 376

01/2007
11.5 Axes and spindles
11-376
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) -- 01/2007 Edition
Motor
Motor
encoder
Drive
Chuck
BERO
Power
connection
Motor encoder
cable
Gear
Toothed belt
Fig. 11-29 Synchronization using BERO
The spindle will be synchronized:
S after the NCK has booted, when the spindle is moved using a programming
command
S after a request to resynchronize from the PLC
NST DB31,... DBX16.4 (Resynchronize spindle 1)
NST DB31,...DBX16.5 (Resynchronize spindle 2)
S after each gear stage change when an indirect measuring system is used
MD31040: ENC_IS_DIRECT (direct measuring system) = 0
S when the encoder limit frequency falls below the programmed value after a
speed has been programmed which is above the encoder limit frequency.
Notice
S 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.
S 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 BERO signal connected to the drive module
must be used for synchronization.
The control then automatically resynchronizes the spindle after each gear
change. No manual intervention is required on the part of the user.
S In general, backlash, gearbox elasticity and reference cam hysteresis
reduce the accuracy achievable during synchronization.
Table 11-44 Synchronizing spindle: Machine data
Axis--specific ($MA_ ... )
34100 REFP_SET_POS Reference point value
34090 REFP_MOVE_DIST_CORR Reference point offset
34200 REFP_MODE Referencing mode
When is
synchronization
necessary?
Machine data
11
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CK Comm
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