Machine data
2.4 Axis-specific machine data
Parameter Manual
248
Operating Instructions, 08/2013, 6FC5397-8EP40-0BA0
Description:
1) For incremental measuring systems:
This is the velocity at which the axis travels during the time between ini-
tial detection of the reference cam and synchronization with the first zero
mark (phase 2).
Traversing direction: Opposite to the direction specified for the cam search
(MD34010 $MA_REFP_CAM_DIR_IS_MINUS)
If MD34050 $MA_REFP_SEARCH_MARKER_REVERSE (direction reversal on reference
cam) is enabled, then if the axis is synchronized with a rising reference cam
signal edge on the cam, the axis traverses at the velocity defined in MD34020
$MA_REFP_VELO_SEARCH_CAM.
2) Indirect measuring system with BERO on the load-side (preferred for spin-
dles):
At this velocity, a search is made for the zero mark associated with the BERO
(zero mark selection per VDI signal). The zero mark is accepted if the actual
velocity lies within the tolerance range defined in MD35150
$MA_SPIND_DES_VELO_TOL as a deviation from the velocity specified in MD34040
$MA_REFP_VELO_SEARCH_MARKER[n].
3) For linear measuring systems with distance-coded reference marks:
The axis crosses the two reference marks at this velocity. The maximum veloc-
ity must be low enough to ensure that the time required to travel the small-
est possible reference mark distance [(x(minimum)] on the linear measuring
system is longer than one position controller cycle.
The formula
Basic dist. Meas.length
[x(minimum)] [mm] = ----------- * Grad.cycle - --------------
2 Basic dist.
with Basic distance [multiple of graduation cycle]
Graduation cycle [mm]
Measuring length [mm] yields:
x(minimum) [mm]
max. velocity [m/s] = ---------------------------------
Position controller cycle [ms]
This limiting value consideration also applies to the other measuring sys-
tems.
Traversing direction:
• as defined in MD34010 $MA_REFP_CAM_DIR_IS_MINUS;
• if the axis is already positioned on the cam, the axis is traversed in
the opposite direction
34040 REFP_VELO_SEARCH_MARKER A03, A11, A04 G1,R1,S1
mm/min, rev/
min
Creep velocity DOUBLE Reset
-
- 1 300.00, 300.00,
300.00, 300.00...
(0./ 0.) (1.e300/ 1.e300) 2/2
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