Rockwell Automation 442L SafeZone Singlezone & Multizone Safety Laser Scanner - Manual (Page 26)

R
SafeZone™ Safety Laser Scanner User Manual
24 10000073050, July 2011
Original instructions
Figure 29: Safety distance to the hazardous area
The safety distance as defined in EN 999 and EN 294 depends
on:
• 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 safety laser scanner
• Reach or approach speed
• Resolution of the SafeZone safety laser scanner
Calculation of the safety distance S:
² First, calculate S using the following formula:
S = 2000 x (T M + T S ) + 8 x (d - 14 mm) [mm]
Where...
² If the result S is ≤ 500 mm, then use the determined value as the safety
distance.
² If the result S > 500 mm, you may be able to reduce the safety
distance using the following calculation:
S = 1600 x (T
M
+ T
S
) + 8 x (d - 14 mm) [mm]
² If the new value S is > 500 mm, then use the newly calculated value as
the minimum safety distance.
² If the new value S is ≤ 500 mm, then use 500 mm as the minimum safety
distance.
Response time of the SafeZone safety laser scanner
The response time T
S
of the SafeZone safety laser scanner depends
on
• The resolution used
• The multiple sampling used
See Section 11.2 “OSSD response times” on page 42.
4.4 Mobile applications
If the dangerous state is produced by a vehicle (e.g. AGV or fork lift), the
hazardous area that is produced by the movement of the vehicle is
protected by the SafeZone safety laser scanner.
For a horizontally mounted mobile application, determine:
• Protective safety field length
• Protective safety field width
• Height of the scan plane
• Restart configuration
• Methods of preventing unprotected areas
4.4.1 Protective safety field length
You must configure the protective safety field such that a safety distance to
the vehicle is maintained. This ensures that a vehicle monitored by the
SafeZone safety laser scanner comes to a stop before a person or object is
reached.
= Safety distance (mm)
= Stopping/run-down time of the machine or system
= Response time of the SafeZone safety laser scanner
= Resolutions of the SafeZone safety laser scanner (mm)
IMPORTANT The reach/approach speed is already
included in the formula.
Contour of the floor and
side walls as reference
IMPORTANT The SafeZone safety laser scanner may
only be used to protect vehicles
powered by electric motor.
Due to the movement of the SafeZone
safety laser scanner in a mobile
application, a resolution of 70 mm is
sufficient for the detection of people.
In the following calculations only take
into account the velocity of the vehicle,
not the speed of the person walking.
This is based on an understanding that
the person will recognize the danger
and stand still.
If the application is to protect vehicles
from collisions, then it will be necessary
to establish guidelines. These are
application specific and can therefore
not be described within this manual.
Contact the relevant authorities and
clarify the guidelines that must be
taken into account with regard to your
application.