Siemens SINUMERIK 802D sl Function Manual page 319

Referencing type
Without reference cam (MD34000
REFP_CAM_IS_ACTIVE = 0)
V - reference point approach velocity (MD34020 REFP_VELO_SEARCH_CAM)
C
V - reference point creep velocity (MD34040 REFP_VELO_SEARCH_MARKER)
M
V - reference point positioning velocity (MD34070 REFP_VELO_POS)
P
R - reference point offset (MD34080 REFP_MOVE_DIST + MD34090 REFP_MOVE_DIST_CORR)
V
R - reference point coordinate (MD34100 REFP_SET_POS)
K
What is the minimum length of a reference cam?
Example of case: Synchronizing pulse before cam, reference coordinate before
synchronizing pulse = synchronizing pulse search with falling cam edge.
The reference cam must be long enough, so that when the cam is approached with the
reference point approach velocity, the braking operation ends at the cam (the axis comes to
a standstill at the cam), and the cam is exited in the opposite direction with the reference
point creep velocity (exit with constant velocity).
To calculate the minimum length of the cam, the larger of the two velocities must be inserted
into the formula:
If the machine axis does not come to a halt at the reference cam (interface signal "Reference
point approach delay" (V380x 1000.7) is reset), alarm 20001 is output. Alarm 20001 can
occur if the reference cam is too short and the machine axis travels over it when decelerating
in phase 1.
If the reference cam extends to the end of travel of the axis, an inadmissible starting point for
referencing (after the cam) can be excluded.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
Synchronizing pulse
(zero mark, BERO)
Synchronizing pulse on cam, reference
coordinate after synchronizing pulse on cam =
with reversal:
(MD34050
REFP_SEARCH_MARKER_REVERSE = 1)
Reference coordinate after synchronizing
pulse
18.2 Referencing with incremental measuring systems
Reference Point Approach (R1)
Motion sequence
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