Rockwell Automation 442L-SFZNMN SafeZone Mini Safety Laser Scanner User Manual User Manual
Page 33
Rockwell Automation Publication 10000337275 Ver 01—October 2014
31
Chapter 5
Mounting
Fig. 20: Stopping distance
Note
Take into account that the braking distance for a vehicle is not linear with increasing velocity, but increases in a square
function.
Fig. 21: Stopping distance as
a function of the vehicle velocity
How to calculate the stopping distance S
A
:
Calculate the stopping distance S
A
using the formula:
S
A
= S
Br
+ S
AnF
+ S
AnS
Where …
S
Br
= Braking distance, to be found in the vehicle documentation
S
AnF
= Distance covered during the response time of the vehicle controller, to be found in the vehicle documentation
S
AnS
= Distance covered during the response time of the safety laser scanner
Distance covered during the response time of the safety laser scanner
The distance covered during the response time of the safety laser scanner depends on …
•
The response time of the safety laser scanner.
•
The maximum velocity of the vehicle in your mobile application.
The response time T
S
of the SafeZone Mini depends on …
•
The basic response time of the SafeZone Mini.
•
The multiple sampling set.
See Chapter 12, “OSSD response times” on page 55
How to calculate the distance S
AnS
covered during the response time of the safety
laser scanner:
Calculate the distance S
AnS
using the formula:
S
AnS
= T
S
× V
max
Where …
T
S
= Response time of the safety laser scanner
V
max
= Maximum velocity of the vehicle from the related vehicle documentation
SafeZone Mini
S
AnF
S
AnS
S
Br
Stopping distance
Stopping distance +
safety supplements
Necessary protective
field length
Speed