Reference Point Approach (R1)
18.2 Referencing with incremental measuring systems
Turning, Milling, Nibbling
320 Function Manual, 11/2012, 6FC5397-1CP10-5BA0
Reference cam adjustment
The reference cam must be calibrated exactly. The following factors influence the response
time of the control when detecting the reference cam ("Reference point approach delay"
interface signal):
● Switching accuracy of the reference cam switch
● Delay of the reference cam switch (NC contact)
● Delay at the PLC input
● PLC cycle time
● Internal processing time
Practice has shown that the signal edge of the reference cam, which is required for
synchronizing, is aligned between two synchronized pulses (zero marks). This can be
achieved by:
● Set MD34080 REFP_MOVE_DIST = MD34090 REFP_MOVE_DIST_CORR = MD 34100
REFP_SET_POS = 0
● Reference axis
● In JOG mode, traverse the axis to half the path length between the two zero marks. This
path is independent of the pitch of the leadscrew S and the gear ratio n (e.g. S=10
mm/rev, n=1:1 produces a path of 5 mm).
● Calibrate the cam switch so that switching is done at exactly this position (IS "Reference
point approach delay" (V380x 1000.7))
● Alternatively, the value of MD34092 REFP_CAM_SHIFT can be changed instead of
moving the cam switch.
WARNING
If the reference cam is not calibrated precisely, an incorrect synchronizing pulse (zero
mark) may be evaluated. In this case, the control assumes an incorrect machine zero
and moves the axes to incorrect positions. Software limit switches act on incorrect
positions and are therefore not able to protect the machine.
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