Short-Circuit Monitoring; Overvoltage Protection (Fuse) - SICK WSU26-2 Instrucciones De Servicio

Operating Instructions
WSU/WEU 26/2
WARNING
8 008 631/P134/20-12-04 © SICK AG • Safety Systems • Germany • All rights reserved
Electrical Installation
4.3

Short-circuit monitoring

The cables from the output contacts are not monitored by the
WEU for short circuits.
Suitable measures
Suitable steps should be taken for monitoring short circuits.
These could be
! Short-circuit safe (protected) routing of cables from the WEU
to the contact elements
! Screening output cables individually and connect screening
to 0 V
! Incorporating both contacts to differing voltage levels
! Using relay(s) at the outputs where the pull in voltage must
be greater than U
4.4

Overvoltage protection (fuse)

A fuse must be provided for the control circuit. The fuse rating
must correspond to the maximum current draw of the output
relay.
/2.
V
GB
Chapter 4
155