Siemens SINUMERIK 840D sl Function Manual page 346

M3: Coupled axes
8.4 Electronic gear (EG)
Synchronization abort with EGONSYN and EGONSYNE
1. The EGONSYN/EGONSYNE command is aborted under the following conditions and
changed to an EGON command:
● RESET
● Axis switches to tracking
The defined synchronization positions are ignored. Synchronous traverse monitoring still takes
synchronized positions into account.
Aborting position synchronization generates alarm 16774.
The alarm may be suppressed with the following machine data:
MD11410 $MN_SUPPRESS_ALARM_MASK Bit31 = 1
Synchronous monitoring
The synchronism of the gearbox is monitored in each interpolator clock cycle on the basis of
the actual values of the following and leading axes. For this purpose, the actual values of the
axes are computed according to the rule of motion of the coupling. The synchronism
difference is the difference between the actual value of the following axis and the value
calculated from the leading axis actual values according to the rule of motion. The synchronism
difference can be queried from the part program (see below).
Changes in the synchronism difference
The mass inertia of the axis systems during acceleration can cause dynamic fluctuations in
the synchronism difference. The synchronism difference is checked continuously and the
tolerance values in the machine data used to produce interface signals.
The synchronism difference is compared with the following machine data:
MD37200 $MA_COUPLE_POS_TOL_COARSE
MD37210 $MA_COUPLE_POS_TOL_FINE
Depending on the result of this comparison, the following signals are set:
NST "Synchronous travel fine" DB31, ... DBX98.0
NST "synchronous traverse coarse" DB31, ... DBX98.1
Difference > .. TOL_COARSE
As long as the synchronism difference is greater than the following machine data, the gearbox
is not synchronized and neither IS "Coarse synchronism" DB 31, ... DBX 98.1 nor IS "Fine
synchronism" DB 31, ... DBX 98.0 is active:
MD37200 $MN_COUPLE_POS_TOL_COARSE
Instead, the following interface signal is displayed:
NST "synchronization running" DB31, ... DBX99.4
346
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions