Siemens SINUMERIK 804D sl Commissioning Manual page 151

• IS: DB31, ... DBX4.7/DBX4.6 ("Traversing keys plus/minus")
• 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 a predetermined maximum distance from the initial position
Phase 2: Synchronizing to the encoder zero marker
The following machine data and interface signals are relevant:
• MD34040 REFP_VELO_SEARCH_MARKER (creep velocity)
• MD34050 REFP_SEARCH_MARKER_REVERSE (direction reversal to reference cam)
• MD34060 REFP_MAX_MARKER_DIST (maximum distance from cam to reference mark)
Properties of phase 2:
• Feed override (the feed override switch) is not active.
• Feed stop (channel-specific and axis-specific) is active.
• Alarm 20005 "Reference point approach canceled"
• NC-Stop/NC-Start is inactive.
• If the machine axis travels as from exiting the reference cam:
CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0
toward the reference cam defined in
– MD34030 REFP_MAX_CAM_DIST (max. distance to the reference cam) without
reaching the reference cam
– IS: DB31, ... DBX12.7 ("Reference point approach delayed") = 0 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 marker 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 "one encoder revolution in each
case.
Danger for man and machine exists.
If a feed override of 0% is selected via the feed override switch, the traverse movement is
stopped.
On a feed stop, the traverse movement is stopped and the alarm displayed:
NCK start-up
10.5 Parameterize axis data
151