Testing - SICK WSU26-2 Instrucciones De Servicio

Operating Instructions
WSU/WEU 26/2
WARNING
WARNING
8 008 631/P134/20-12-04 © SICK AG • Safety Systems • Germany • All rights reserved
Electrical Installation
Use normally-open outputs!
In new factories, both normally-open outputs must be indepen-
dently supplied to two contact elements (e.g. contractors, re-
lays). The normally-closed output should be used only for
functions that are not directly safety-related.
In general, the normally-open contacts
should be used. However, in older
factories a normally-open / normally-
closed combination was selected.
This no longer conforms to present-
day safety requirements. Should the
WSU/WEU be installed in old factories,
both normally-open contacts should
be connected in series to the
normally-closed contact as a second
channel.
4.1

Testing

This enables a check to be made on the contact elements con-
nected. In the process, operation of the normally-closed con-
tacts will de-activate the sender. Testing is initiated during a
minimum open time (see Section 9 Technical Data).
Testing must be undertaken via machinery control in the safe
phase (e.g. a safe movement). If the test is unsuccessful, the
power-driven machine - initiated by the WEU - will receive a de-
energize signal from the machinery control system.
Use the testing function as described!
The test input must be used exclusively as described.
Chapter 4
4 5 6 7 8 9
K1 K2
Installation in old facto-
ries
GB
153