Start-Up Of Gantry Axes - Siemens SINUMERIK 840D sl Function Manual

2.4

Start-up of gantry axes

General information
Owing to the forced coupling which is normally present between leading and synchronized
gantry axes, the gantry axis grouping must be started up as if it were an axis unit. For this
reason, the axial machine data for the leading and synchronized axes must always be defined
and entered jointly.
If the synchronized axis is being overloaded by the leading axis due to reduced dynamics, this
is acknowledged with alarm 10656.
Special points to be noted with regard to starting up gantry axes are described below.
Axis traversing direction
As part of the start-up procedure, a check must be made to ensure that the direction of
rotation of the motor corresponds to the desired traversing direction of the axis. Correct by
means of axial machine data:
MD32100 $MA_AX_MOTION_DIR (traversing direction)
Activation of the axis grouping
MD37100 $MA_GANTRY_AXIS_TYPE (gantry axis definition)
This machine data is determined for the following gantry axis:
• To which gantry grouping (1, 2 or 3) the axis must be assigned,
• Whether it is to act as the leading axis (single-decade MD value only) or as a synchronized
axis.
Note
Please make sure that a gantry grouping specified as cross-channel or cross-NCU does
not clash with gantry grouping numbers already assigned. In this case the gantry
grouping numbers must be clearly assigned cross-channel and cross-NCU. If this is not
the case, alarm 10651 is output with reason 40XX. XX is the gantry grouping causing the
clash.
For start-up purposes, all axes in a gantry grouping must be declared either as linear axes or
as rotary axes:
MD30300 $MA_IS_ROT_AX (rotary axis/spindle)
Table 2-1
MD37100 $MA_GANTRY_AXIS_TYPE
0
1
11
2
12
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Examples for defining the gantry axis grouping
2.4 Start-up of gantry axes
Gantry axis
None
Leading axis
Synchronous axis
Leading axis
Synchronous axis
G1: Gantry axes
Gantry grouping
-
1
1
2
2
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