SICK WEU26-3 User Manual

Chapter 3 Operating Instructions
WSU/WEU263
10 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8013338/YTA4/2016-03-24
Subject to change without notice
Product description
3 Product description
T
his chapter provides information on the special features, the operating principle, the
structure and the function of the WSU/WEU26@3 devices.
 Please read this chapter before mounting, installing and commissioning the
WSU/WEU26@3 devices.
3.1 Special features
• relay outputs
• rugged type of construction
• high operating range up to 70 m
• front screen heating
3.2 Operating principle of the device
The single-beam photoelectric safety switch consists of a WSU26-3 sender unit and a
WEU26-3 receiver. The sender unit WSU26-3 emits a beam of light that is received by the
receiver unit WEU26-3.
RW
WSU26-3 WEU26-3
If the light beam is interrupted by an object, a switching command is triggered. The
machine or plant controller that evaluates this message must then bring the dangerous
movement to a halt.
Sender and receiver units are equipped with LEDs for the operational check. Their function
as diagnostic elements is described in chapter 6 “Commissioning”.
The diagnostics LEDs are used for fault diagnosis (see chapter 8 “Fault diagnosis”).
The WSU/WEU26@3 devices are not equipped with an internal restart interlock.
F
ig.
1
:
Key data for the
WSU/WEU26&3 devices
0.5 ... 20 m
15 ... 70 m
Light path between se
nder and receiver

SICK WEU26-3 Specifications

General

Brand	SICK
Model	WEU26-3
Category	Security Sensors
Language	English