Control Dynamics; Opening The Gantry Grouping - Siemens SINUMERIK 840D sl Function Manual

3.2.5

Control dynamics

Use case
From the user perspective, a gantry grouping is exclusively traversed via the leading axis. The
NC generates the setpoints of the synchronous axes directly from the setpoints of the leading
axis in time synchronism and outputs these to them. To minimize the synchronous operation
differences, the control system dynamics of all axes of a gantry grouping must be set identical
(see Section "Start-up of gantry axes (Page 160)").
Note
Identical control dynamics must be set for all axes of a gantry grouping.
Disturbance characteristic
If faults occur, which cause an axis of the gantry to be stopped, then the complete gantry
grouping is always stopped.
3.2.6

Opening the gantry grouping

Description
The axis coupling within a gantry grouping can be opened (dissolved) using the following
machine data:
MD37140 $MA_GANTRY_BREAK_UP = 1 (invalidate gantry grouping)
No synchronous operation
If the gantry axes remain mechanically coupled, there is a risk of damage to the machine
when the leading or synchronous axes are traversed in this operating state!
When the setting becomes active, the axes of the gantry grouping can be individually traversed
in the JOG, AUTOMATIC and MDA modes.
The monitoring functions of the synchronism difference and/or the alarm and trip limits are not
active.
The NC/PLC interface signal "Gantry grouping is synchronized" is reset:
DB31, ... DBX101.5 = 0
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
CAUTION
G1: Gantry axes
3.2 "Gantry axes" function
149