Festo Электроцилиндр User Manual
Page 106
6
Diagnostics
106
Festo – GDCP-CMMO-ST-EA-SY-EN – 1301a – English
6.4.5
Malfunction “Index pulse too close on proximity sensor” (2E
h
)
In the homing run to the proximity sensor with index search, the drive initially moves into the switching
range of the sensor and then reverses. After the switching range is exited, the controller searches for
the nearest index pulse. This applies as the homing 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: If the switching point moves (e.g. due to
temperature influence) so that it lies behind the index pulse, then the controller will use
the index pulse after that as a reference point. The entire measuring reference system
could then be shifted, for example, by a rotary drive by a full motor revolution.
1. Check the distance of the switching point to the index pulse:
FCT, “Project output” window,
“Homing” tab.
2. Then move the proximity sensor a few tenths of a mm up to several millimetres (depending on axis
type).
REF
1
2
3
1 Switching range of the proximity sensor
2 Index pulse
3 Recommended position: centrally between
two index pulses