Festo DGE-25-ZR-RF Instrucciones De Utilizacion página 41

DGE−...−ZR−RF
Carry out these steps if you wish to use ALL position scanners:
S
M
Fig. 27
M = motor
X = interface with emergency stop circuit
Z = interface with controller
W = mechanical end position
S = safety limit or switching point of safety limit switch
H = switching point of hardware limit switch
R = reference point position
O positioning limits of software control
O/2 = centre of stroke
d = length of cam
h = stroke reserve
n = braking path 1
r = braking path 2
x = Distance of the reference point switch from the hardware limit switch next to the motor
Protecting the end position against uncon
trolled overrunning:
Use limit switches with normally−closed
S
function.
This will protect the product with a broken
limit switch cable against overrunning the
end position.
Festo DGE−...−ZR−RF 0405a English
H R
S x
W
n
r
d
h
O/2
O
X
d > x
S
W
d > h
n
r
h = n + r
h
Z
O
Fig. 28
41