6 Assi
nin
Parameters to the Control and the PLC Pro
ram
6
03.96
6.9 Axes and spindles
6-147
Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
To synchronize the spindle, it must always be rotary via a programming com-
mand (e.g. M3, M4, SPOS). It is not sufficient to enter a spindle speed via the
directional keys of the appropriate axis on the machine control panel.
MD 34100: REFP_SET_POS (reference point value, zero mark position)
The position of the reference signal during synchronization is entered in this
MD.
MD 34090: REFP_MOVE_DIST_CORR (reference point offset, zero mark off-
set)
The zero mark offset resulting from the synchronization process is entered here.
MD 34200: ENC_REFP_MODE (position measuring system type)
IS “Resynchronize spindle 1, 2” (DB31, ... DBX16.4 or 16.5)
IS “Referenced/synchronized 1, 2” (DB31, ... DBX60.4 or 60.5)
Motor
Motor
encoder
SIMODRIVE 611D MSD module
Chuck
BERO
Power con-
nection
Motor en-
coder cable
Gearing
Toothed belt
Fig. 6-23 Synchronization via an external reference signal (BERO)
Note
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 re-synchronizes the
spindle position after every gear stage changeover. The user need not take any
further measures in this respect. The attainable accuracy is impaired by
backlash, elasticity in the gearing and the Bero signal hysteresis, during the
synchronization progress.
If a Bero is used, MD 34200: ENC_REFP_MODE must be set to 2.
Machine data and
interface signals
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