Allen-Bradley 442L-SFZNMN, User Manual

Page: 41 / 108

Rockwell Automation Publication 442L-UM005B-EN-P - April 2017 41
Mounting Chapter 4
Protective Field Size
The protective field must be configured so the minimum distance (S) to the
hazardous area is maintained. This safety distance helps ensure that the
hazardous point can only be reached after the dangerous state of the machine
has been stopped completely.
Figure 15 - Minimum Distance S
The minimum distance S ( Figure 15 ) depends on the following:
• Approach speed of the body or parts of the body
• Stopping/run-down time of the machine or system
(The stopping/run-down time is shown in the machine documentation
or must be determined by taking a measurement.)
• Response time of the SafeZone Mini device
• Supplements for general measurement errors and any measurement
errors that are related to reflection
• Supplement for prevention of reaching over
• Height of the scan plane
• Possibly the time for switching between the monitoring cases
IMPORTANT You can operate the SafeZone Mini device in stationary horizontal operation
with 30, 40, 50, or 70 mm (1.2, 1.6, 2.0, or 2.8 in.) resolution. The resolution
gives the maximum protective field range for the SafeZone Mini device.
ATTENTION: Verify that a human leg can be detected with 70 mm (2.8 in.)
resolution.
As per EN ISO 13855, mount the scan planes for horizontal stationary
applications with 70 mm (2.8 in.) resolution at least 300 mm (11.8 in.) above
the floor (see
Height of Scan Plane on page 52 ).
Dangerous state
K x (1
M
+ 1
s
)
2
G
+ 2
R
+ O
S