6.6.3
Detection signal generation conditions
When the sensor is mounted on moving parts, it will detect static objects as moving
objects.
The sensor will trigger a detection signal if the following conditions are met:
l
The RCS (Radar Cross-Section) of static objects is greater than or equal to the RCS of
a human body
l
The relative speed between the objects and the sensor is greater than the minimum
speed necessary for detection.
6.6.4
Prevention of unexpected restart
As for static installations, when the moving part where the sensor is installed is arrested
because of a detection, the system will switch to restart prevention safety function and
the sensor will detect the presence of static people (see
). Static objects are then automatically filtered out and no longer
detected.
The restart of the moving vehicle or moving part of the machinery in the presence of
static objects can be prevented using the following methods:
l
Static object detection option enabled (see
Restart prevention function: static object
).
l
Anti-masking function: if the function is enabled, an error will occur when the static
object will be close enough to limit the detection of the sensor.
Note
: if the anti-masking function is active when the sensor is moving also, this could
generate false alarms since the environment change during movement could be
detected as tampering.
l
Manual restart: the restart is triggered externally and only once the static object is
removed from the trajectory of the moving vehicle or moving part.
l
Application logic on PLC/control that permanently stops the moving part if multiple
stops occur immediately after the restart of the part. If the vehicle or the part stops
very quickly after the restart, this probably means that there is a static obstacle.
Once the moving part is stopped, the sensor does not detect the object anymore and
therefore the part moves but it stops again as soon as it detects the object again.
6.6.5
Recommendations for positioning the sensor
When the sensor is moving, the floor should be treated as a static object. The sensor
must be positioned so that the floor is excluded from the sensor's detection area.
Below are some recommendations for the sensor positioning:
l
as low as possible, but not below 30 cm (11.8 in) above the ground
l
with a suggested inclination of 10°
6 SENSOR POSITION
8027489/2022-03-01 | SICK
Subject to change without notice
O P E R A T I N G I N S T R U C T I O N S | safeRS3
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