Allen-Bradley 442L-SFZNMN, Руководство пользователя

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44 Rockwell Automation Publication 442L-UM005B-EN-P - April 2017
Chapter 4 Mounting
Scan Plane Height (70 mm [2.8 in.] Resolution)
Due to the radial sampling of the protective field, the optical resolution is
lower the further away you get from the safety laser scanner.
Figure 17 - Relationship between Resolution and Protective Field Mounting Height
If you choose a resolution of 70 mm (2.8 in.) in the SCD software for
hazardous area protection, a human leg may, in certain circumstances, not be
detected (for example, scan to left and right of the bone - A in Figure 17 ).
If you mount the SafeZone Mini device higher, the scan plane is at calf height
and the leg is also detected with an object resolution of 70 mm (2.8 in.) (B in
Figure 17 ).
Stationary Application in
Vertical Operation for Access
Protection
Access protection can be used when the access to the machine can be defined
by physical means. For access protection, the SafeZone Mini device detects the
entry of an entire body.
• To achieve adequate access protection, a response time of ≤90 ms and a
resolution of 150 mm (5.91 in.) or finer are required.
• To help protect the protective device against inadvertent adjustment or
manipulation, you must use the contour of the surroundings as a
reference for the SafeZone Mini device (see Use the Contour as a
Reference on page 35 ).
Minimum Distance
For access protection, a minimum distance (S) must be maintained between
protective field and hazardous area. This safety distance helps ensure that the
hazardous point can only be reached after the dangerous state of the machine
has been stopped completely.
A B