Festo DMES Serie Instrucciones De Utilizacion página 29

DMES
Installation of external accessories
To protect the end positions against overrunning:
Check whether proximity sensors are necessary (hardware limit switches).
S
If proximity sensors are used as limit switches:
Use proximity sensors with normally closed function.
S
These protect a DMES with a fractured proximity sensor cable from
overrunning the end position.
If proximity sensors are used as reference switches:
Use proximity sensors that correspond to the input of the controller being
S
used.
If you are using magnetically−actuated proximity sensors:
Use the slots as shown in è Fig. 15.
S
Note that the magnet is situated asym
S
metrically on the inner slide (on the side
facing away from the motor).
Avoid external influence caused by mag
S
netic or ferrite parts in the vicinity of the
proximity sensors (minimum distance of
10 mm to the slot nuts).
For DMES−25: Only place proximity sen
S
sors in the lateral slots. The magnetic field
in the lower slot is very weak.
For DMES−40: Only place the proximity sensors SMT−8 (high response sensitiv
S
ity) in the lateral slots. The magnetic field in the upper slots is very strong
(danger of multiple switchings).
Festo DMES 0909c English
DMES−18
DMES−25
Fig. 15
29