Product Description; System Design; Mode Of Operation - SICK WSU26-2 Instrucciones De Servicio

Operating Instructions
WSU/WEU 26/2
3

Product Description

8 008 631/P134/20-12-04 © SICK AG • Safety Systems • Germany • All rights reserved
Product Description
3.1

System design

The WSU/WEU Photoelectric Safety Switch comprises the follo-
wing components:
! WSU Sender unit
! WEU Receiver unit
3.2

Mode of Operation

The WSU/WEU 26/2 Photoelectric Safety Switch consists of
one sender unit and one receiver unit. The WSU sender unit
emits a light beam, which is picked up by the WEU receiver
unit.
An interruption in the light beam by an object causes the out-
put relay to de-energize, which stops the machine.
The sender and receiver units are equipped with LEDs for func-
tion monitoring. Their function as a diagnostic element is set
out in Section 6 Commissioning.
Indicator diodes on the device signal the various operating mo-
des (see Section 6.2 Fault Diagnosis). However, the informati-
on that they display is not relevant to safety status. The
indicator diodes also serve as error diagnostic systems (see
Section 6.2 Fault Diagnosis).
GB
Chapter 3
151