Siemens SINUMERIK 840Di sl - Page 433

NC Commissioning with HMI Advanced
11.5 Axes and spindles
Manual
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
433
● IS DB31, ... DBX12.7 ("Reference point approach delay")
● IS DB31, ... DBX60.4, DBX60.5 ("Referenced/synchronized 1, 2")
Properties of phase 1:
● The feedrate override (feedrate switch) is active.
● The feed stop (channelspecific and axisspecific) is active.
● The machine axis can be stopped and restarted with NC-stop/NC-start.
● If the machine axis travels from the starting position in the direction of the reference cam
by a distance defined in MD34030 $MA_REFP_MAX_CAM_DIST (maximum distance to
reference cam) without reaching the reference cam (IS DB31,... DBX12.7 ("delay in
reference point travel") = 0), then the axis stops and Alarm 20000 "Reference cam not
reached" is output.
WARNING
If the reference cam is not calibrated exactly, it is possible that a wrong zero mark is
evaluated after the reference cam has been left. As a result, the control system will take
a wrong machine zero.
Software limit switches, protection areas and work area limits will thus also be active for
the wrong positions. The difference is equivalent to ± 1 encoder revolution in each case.
Danger for man and machine exists!
Phase 2: Synchronizing to the encoder zero mark
The following machine data and interface signals are relevant:
● MD34040 $MA_REFP_VELO_SEARCH_MARKER (creep velocity)
● MD34050 $MA_REFP_SEARCH_MARKER_REVERSE (direction reversal on reference
cam)
● MD34060 $MA_REFP_MAX_MARKER_DIST (Maximum distance from cam to reference
mark)
Properties of phase 2:
● Feed override (the feed override switch) is not active.
If a feed override of 0% is selected via the feed override switch, the traverse movement is
stopped.
● Feed stop (channel-specific and axis-specific) is active.
On a feed stop, the traverse movement is stopped and the following alarm displayed:
– Alarm 20005 "Reference point approach canceled"
● NC-Stop/NC-Start is inactive.
● If the machine axis travels, after leaving the reference cam (IS DB31, ...DBX12.7 ("Delay
in reference point travel") = 0), a maximum distance parameterized in machine data
MD34060 $MA_REFP_MAX_MARKER_DIST (max. distance from reference mark)
without detecting the zero mark, the machine axis stops and the following alarm is
displayed:
– Alarm 20002 "Zero mark missing"