Chapter 5 Operating Instructions
WSU/WEU263
22 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8013338/YTA4/2016-03-24
Subject to change without notice
Electrical installation
5 Electrical installation
5.1 Important information for the installation
Switch the entire machine/system off line!
The machine/system could inadvertently start up while you are connecting the devices.
Ensure that the entire machine/system is disconnected during the electrical installation.
• The WSU/WEU26@3 single-beam photoelectric safety switch meets the interference
suppression requirements (EMC) for industrial use (interference suppression class A).
When used in residential areas it can cause interference.
• A safety extra-low voltage SELV/PELV must be used to supply power to the
WSU/WEU26@3 devices.
• The external voltage supply must bridge a brief mains failure of 20 ms (EN 60204).
Suitable power supplies are available as accessories from SICK.
• Prior to opening the cover (see chapter 10.4 “Dimensional drawings”) all cables for the
supply voltage and the relay connections must be electrically isolated.
• Only open the device with appropriate protection against ESD, i.e. pay attention to
earthing. In the device only touch the connection terminals, not the other parts of the
electronics. All work on the open device is only allowed to be undertaken by qualified
safety personnel.
• If the cover is open, the device does not provide any protective function.
• The connecting cables must be laid directly to the terminal strip.
• After mounting, the firm seating of the connecting cables in the connection terminals
must be checked.
• Observe torque figure for the protective conductor connection (“PE”) (see chapter 5.2
“System connection”, Tab. 9/Tab. 10, Fig. 14/Fig. 15).
• On the installation of another PG connector, it is necessary to comply with the torque
data for the PG connector (see chapter 10.4 “Dimensional drawings”).
• Prior to screwing in place the cover, the seal must be checked for contamination and
damage. Fasten the cover to the related torque (see chapter 10.4 “Dimensional
drawings”).
• After opening the cover, the complete commissioning function test must be performed
(see chapter 6 “Commissioning”).
WARNING
Notes:
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