Rockwell Automation 440L GuardShield PAC Type 4 Safety Light Curtain - Manual (Page 13)

GuardShield™ PAC Safety Light Curtain Installation Instructions
11
Original instructions
How to Calculate the Safety Distance S
According to EN ISO 13855 and EN ISO 13857:
® First, calculate S using the following formula:
S = 1600 × (Ts + Tr) + C
Where …
Ts = stopping/run-down time of the machine
+ response time of the protective device [s]
Tr = response time of the GuardShield PAC
S = safety distance [mm]
C = safety supplement
S = 1600 x (0.250 + 0.020) + 850 mm
S = 1600 x (0.270) + 850 mm
S = 432 + 850 mm
S = 1282 mm
Minimum Distance from Reflecting Surfaces
The infrared light from the sender may be reflected off of shiny
surfaces and be received by the system’s receiver. If this condition
occurs, it can result in an object not being detected when it enters
the GuardShield PAC’s sensing field.
All reflecting surfaces and objects (e.g. material bins) must
therefore be located at a minimum distance a from the protective
field of the system. The minimum distance a depends on the
distance D between sender and receiver.
Figure 8: Minimum distance from reflecting surfaces
How to Determine the Minimum Distance from the
Reflecting Surfaces:
® Determine the distance D [m] sender-receiver
® Read the minimum distance a [mm] from the graph:
Figure 9: Graph, minimum distance from reflecting surfaces
a
Distance D (meters)
The effective aperture angle for the GuardShield PAC system is +/-
2.5° at a mounting distance of > 3.0 m (9.8 ft). Calculate the
minimum distance to reflecting surfaces depending on the
distance between the transmitter and the receiver, using an
aperture angle of +/- 2.5°, or take the appropriate value from the
following table:
Note: Note: formula: a = tan 2.5° x D [mm]
a = minimum distance to reflecting surfaces
D = distance between transmitter and receiver
Installation and Mounting
This section describes the preparation, selection and installation
of the GuardShield PAC safety light curtain.
The GuardShield PAC safety light curtain is suitable for most
operating environments (IP65 environmental rating). Proper
safety distance must be observed.
Determine if the machinery, on which the GuardShield PAC is to
be mounted, meets the requirements as specified in the
beginning of this manual, i.e., machinery must be able to be
stopped anywhere in its stroke or cycle, consistently and
repeatedly.
The GuardShield PAC must be mounted at the proper distance
from the point of operation hazard. This distance is referred to as
the Safety Distance.
ANSI/RIA 15.06 requires that the first beam of the GuardShield
PAC be mounted at 300 mm (12 in.) off of the floor in vertical
applications. The protective height of the GuardShield PAC three
beam is 820 mm. The combination of 300 mm (12 in.) and 820
mm equals 1120 mm which meets the ANSI/RIA 15.06
requirements of a “reach over” application. This requires that the
depth penetration factor (Dpf ) be 48 in. when performing the
safety distance calculation.
Distance Between Transmitter and Receiver
(Range L) [m (ft)]
Minimum Distance
a [mm (in.)]
0.2 to 3.0 (0.65 to 9.8) 135 (5.31)
4.0 (13.1) 175 (6.88)
5.0 (16.4) 220 (8.66)
6.0 (19.6) 265 (10.43)
7.0 (22.9) 310 (12.2)
10.0 (32.8) 440 (17.32)
16.0 (52.4) 700 (27.55)
IMPORTANT
The installation of the GuardShield PAC safety
light curtain must adhere to the ANSI
standard B11.19/E4.2.3.3.6, which requires
that a presence sensing device shall prevent
the operator or others from reasonably
reaching over, around, or under the sensing
field into the hazardous area. Auxiliary
safeguarding may be required in conjunction
with the GuardShield PAC to meet this
requirement.