Festo Контроллеры двигателя SFC-LAC - Manual (Page 219)

6. Diagnostics and error display
6−19
Festo GDCP−SFC−LACI−CO−EN en 0812NH
6.7 Warning Index pulse warning"
In the homing run to the proximity sensor, the drive initially
moves into the switching range of the sensor and then reĆ
verses. After the switching range is exited, the SFC−LACI
searches for the nearest index pulse. This applies as the homĆ
ing point.
Note
Material damage due to moved measuring reference
system
The following situation arises if the switching point of
the proximity sensor and the index pulse lie very close
to one another: Should the switching point move (e.g. due
to temperature influence) such that it then lies behind the
index pulse, then the SFC−LACI will use the index pulse
after that as a reference point. The entire measuring
reference system would then be offset by 2 mm in
DFME−...−LAS, in DNCE−...−LAS: by 5 mm.
Remedy:
1. Check the distance of the switching point to the index
pulse: see FCT, Homing" page, Homing" register
(or CI 2FFE/0Dh, see Appendix B).
2. Then move the proximity sensor a few tenths of a mm.
1
Switching range
of the proximity
sensor
2
Index pulses
(every 2 or 5Ămm)
3
Recommended
position: in the
centre between
two index pulses
REF
1
2
3