Allen-Bradley 442L-SFZNMN, User Manual

Page: 49 / 108

Rockwell Automation Publication 442L-UM005B-EN-P - April 2017 49
Mounting Chapter 4
Calculate the Protective Field Length S
L
See EN ISO 13855. Calculate the necessary protective field length SL with the
formula:
S
L
= S
A
+ Z
G
+ Z
R
+ Z
F
+ Z
B
Calculate the Stopping Distance S
A
The stopping distance comprises the braking distance for the vehicle, the
distance covered during the response time of the safety laser scanner, and the
response time of the vehicle controller.
Figure 20 - Stopping Distance
Variable Description
S
A
Stopping distance
Z
G
General safety supplement of the SafeZone Mini device = 100 mm (3.94 in.)
Z
R
Supplement for any reflection-related measurement error of the SafeZone Mini device
Z
F
Supplement for any lack of ground clearance of the vehicle
Z
B
Supplement for the reduction in the braking performance of the vehicle to be found in the related
vehicle documentation
IMPORTANT
Consider that the braking distance for a vehicle is not linear with increasing
velocity, but increases in a square function.
SafeZone Mini
S
AnF
S
AnS
S
Br