Safety Features - SICK T4000 Notice D'instructions

3
Chapter
Note
WARNING
154
© SICK AG • Industrial Safety Systems • Germany • Subject to change without notice
System description
If an internal error occurs in the evaluation unit, the
safety circuit is disconnected, the diagnostic output
(ERROR) is set to HIGH and the red ERROR LED
lights up.
The dwell time of an actuator inside and outside
the operating range must be at least 0.5 seconds,
otherwise the evaluation unit could enter the error
state so that the red ERROR LED lights up. Dis-
connecting the voltage supply returns the evalua-
tion unit to the operating state.
3.2

Safety features

The safety switch T4000 complies with the following
safety requirements
Up to Performance Level PL e as per
EN ISO 13849-1,
Proximity switch with self-monitoring, type PDF-M
in accordance with EN 60947-5-3.
The circuit in the evaluation unit is configured
using redundancy design techniques with self-
monitoring.
As a result, the safety guard remains active even
if a component fails.
When the safety guard is opened or closed, a
check is conducted in order to establish whether
the relays of the safety guard are opening and
closing correctly.
Safety switches perform personnel safety func-
tions. Incorrect installation or tampering may lead
to serious injury.
1)
At < 90.000 switching operations per year (see chapter 7.2.3 "Technical
data T4000-1RB.01").
1)
Operating Instructions
T4000
8009704/US09/2010-12-20