20
SICK WSU 26/2 – WEU 26/2
8 008 692/9-12-99 Technical Description · WSU/WEU 26-2 © SICK AG · Safety Systems · Germany · All rights reserved
K1 to K4
Contactors or relays with positively-driven contacts
(not supplied)
Fu
Arc-suppression, essential
S
Command unit, e.g. pushbutton, key-operated switch etc.
Press button S to start, otherwise red LED on WEU remains lit.
x and y
Insert in safe machine controller to interrupt the hazardous
movement. For safety reasons, the two contact rows (x and y)
must be inserted separately into the controller (two-channel).
z
If, in exceptional cases, depending on the risk assessment, the
controller of the power-driven machinery is only of single-channel
design, contact row z can be used.
Fig. 22: Example of a connection with one WSU/WEU-26 system
k 1
k 2
k 3
k 4
K 1
K 2
K 3
K 4
k 1
k 2
k 3
k 1
k 2
k 3
S
k 4
k 1
k 2
k 3
k 4
k 1
k 2
k 3
k 4
k 4
F