SICK WTT12-S Instrucciones De Funcionamiento página 27

8.3 Thorough check during commissioning
9 Regular thorough checks
8029123/2024/01/15 | SICK
Subject to change without notice
"Object between sensor and reference" safety function – LED is off/digital
°
output LOW
"Absence of reference" safety function – LED is on/digital output ACTIVE
°
• If the teach-in fails, the LED flashes quickly (8 Hz) for 5 seconds
The sensor and its configuration must be checked before commissioning – this is
always necessary if the sensor has been newly taught-in to the reference surface.
The thorough check is intended to ensure that the sensor performs its task in the
safety function correctly – the prerequisite is a successful teach-in in accordance with
section 8.2.
WARNING RISK OF INEFFECTIVENESS OF THE PROTECTIVE DEVICE!
When commissioning the device or subsequently modifying the parameters, the effec‐
tiveness of the protective device in the application must be reviewed and documented.
For a safety-related use of the device, this may in certain circumstances include a
comprehensive safety assessment.
Table 7: Thorough check during commissioning
Safety function
"Object between sensor and
reference"
"Absence of reference"
At regular intervals the user must demonstrate that the measures taken still fulfill
the protective purpose, and that the protective device still functions correctly in the
application during the service life.
Thorough checks and tests are required in this regard:
• Upon commissioning (e.g., initial commissioning, recommissioning)
• After changes and extraordinary events (e.g., conversion, change of parameters,
modification, retrofitting and equipment, damage, repair, ...)
•
At regular intervals (e.g., recurring thorough checks intended to ensure that a
safety-related function and/or safety function still functions correctly in the appli‐
cation)
These thorough checks must be documented clearly and comprehensibly.
Determination of the time intervals for thorough checks at regular intervals must be
decided and established by the manufacturer of the machine and/or by the operating
entity depending on the specific application, place of application and influencing fac‐
tors prevailing there (e.g., dirt, demand rate, EMC, ...).
OPERATING INSTRUCTIONS
Test procedure
Move object into the specified
object area
Remove object
Switch test input to active
Switch test input to inactive
View of surface behind the ref‐
erence surface or object (e.g.,
step/opening to be detected)
View back to reference sur‐
face or object
Switch test input to active
Switch test input to inactive
O P E R A T I N G I N S T R U C T I O N S | WTT12-S
Expected result
Q switches to ACTIVE, LED on
Q switches to INACTIVE, LED off
Q switches to ACTIVE, LED on
Sensor is ready for operation
Q switches to INACTIVE, LED off
Q switches to ACTIVE, LED on
Q switches to INACTIVE, LED off
Sensor is ready for operation
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