Siemens SINUMERIK 802D sl Function Manual page 95

Loss of synchronization
The gantry grouping becomes desynchronized (V390x 5005 = 0) if:
● The gantry axes were in "Follow-up" mode
● The reference position of a gantry axis is lost, e.g. during "Parking" (no measuring system
● A gantry axis is re-referenced (V390x 0000 = 0)
● The gantry grouping was separated (MD37140 = 1)
In cases where the gantry grouping has lost synchronization during operation as the result of
a disturbance, then the gantry synchronization process can be restarted directly by means of
IS "Start gantry synchronization" (condition: V390x 0000 = 1 for all axes in the gantry
grouping). In this case, the synchronizing axes traverse the current actual position of the
leading axis in the decoupled state.
If an EMERGENCY OFF occurs while a gantry grouping is moving, and is then rescinded,
and both axes have drifted apart less than the standstill tolerance of the following axis, then
the gantry grouping will automatically synchronize. It no longer needs to go in the BA REF.
Reference point selection
To ensure that the shortest possible paths are traversed when the gantry axes are
referenced, the reference point values for the leading and synchronized axes should be the
same (MD34100).
Allowance for deviations in distance between the zero mark and the reference point must be
made for specific axes via the machine data:
● MD34080 REFP_MOVE_DIST (reference point distance)
● MD34090 REFP_MOVE_DIST_CORR (reference point offset/absolute offset)
Referencing direction selection
The zero mark leveling function of the following axis can be defined using the following
machine data:
MD37150 GANTRY_FUNCTION_MASK bit 1
Bit
1
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
active)
Value Meaning
0 The zero mark leveling function of the following axis is similar to
MD34010 REFP_CAM_DIR_IS_MINUS.
1 The zero mark leveling function of the master axis is the same as the slave axis
6.3 Referencing and synchronizing gantry axes
Gantry axes (G1)
95