Festo DGE-ZR-RF Serie Instrucciones De Utilizacion página 49

DGE− −ZR−RF
The following then applies:
A braking path of length n remains between the response point of the
hardware limit switch and the response point of the safety limit switch
(è also Fig. 25).
The response ranges of the safety limit switch and the hardware limit switch
overlap. In this way you can avoid undefined operating states when the axis
is switched on.
In spite of the defined end position (S) being overrun, the safety limit
switches remain actuated up to the mechanical end position (W).
REF
HW
SS
Fig. 31
REF = reference point switch
HW = hardware limit switch
SS
Fasten the reference point switch (if necessary) between the hardware limit
S
switches under the following condition:
There must be a point at which both the reference point switch as well as the hard
ware limit switch near the motor respond simultaneously (x < d, è Fig. 25).
Checking the functions
1. Push the slide into a mechanical end position.
2. Check whether the safety limit switches and the reference point switches
function correctly and whether the switching lug is seated free of play.
Repeat points 1 to 2 in the other end position.
Festo DGE− −ZR−RF 0906d English
H
R
x
S
W
n
r
O
= safety limit switch
O/2
H
S
W
n
r
O
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