Rockwell Automation 445L GuardShield Safe 2 and Safe 2 PAC Safety Light Curtains User Manual - Manual (Page 7)

R
GuardShield™ Safe 2 Safety Light Curtain User Manual
5
Original instructions
Figure 1: Components of the GuardShield Safe 2
The protective field and the active elements respectively, are clearly
recognized as black surfaces with the integrated optical lenses.
The width of the protective field is derived from the length of the light
path between sender and receiver and must not exceed the maximum
rated width of the protective field
• 0…18 m (59.1 ft) for 30 mm (1.18 in.) resolution, or
• 5…30 m (16.4…98.4 ft) for Safe 2 PAC
Perimeter Systems (PAC)
Perimeter systems are usually produced by means of several single-beam
light barriers. But the flexibility of the GuardShield Safe 2 system allows
also the production of vertical entry safeguarding according to the
standard EN ISO 13855 [2010]. Such systems are composed of active
and passive elements in one compact profile. The element length of each
is 120 mm (variations are given in the appendix).
The protective field and the active elements respectively, are clearly
recognized as black surfaces with the integrated optical lenses. The areas
not monitored (passive elements) are also clearly indicated as yellow
surfaces.
Figure 2: Perimeter systems (2- and 3-beams) according to EN ISO 13855 (2010)
Examples of Range of Use
The GuardShield Safe 2 safety light curtain operates as a proper
protective device only if the following conditions are met:
• The control of the machine must be electrical.
• The controlled machine must be able to be stopped any where in
the machines stroke or cycle.
• The transmitter and receiver must be mounted such that access to
the hazard is only through the light curtain’s protective field.
• The restart button must be located outside the hazardous area
such that it cannot be operated by a person working inside the
hazardous area.
• The statutory and local rules and regulations must be observed
when installing and using the device.
GuardShield Safe 2 Laser Alignment
The laser light source in the Integrated Laser Alignment system of the
GuardShield Safe 2 light curtains is a Class 2, eye safe laser diode with a
wavelength of 630 nm.
This Class 2, eye safe laser is switched from a low output power state to a
high output power state (and back again) by means of control circuitry
which detects reflected laser light from a temporary blockage of the
emitted laser light. This is most commonly accomplished by a person’s
finger placed over the laser overlay window. There is also an automatic
shutdown feature that switches the laser diode from the high power state
to the low power state if there is no finger or other interruption detected
for a period of five minutes.
During the high output mode of operation, the laser is pulsed at a rate of
approximately 2 Hz in order to facilitate finger detection in high ambient
light conditions.
Transmitter Receiver
300
900
Reference plane (e.g. ground)
0
300
1100
Reference plane (e.g. ground)
0
700
IMPORTANT
Additional measures may be necessary to
ensure that the ESPE does not fail to danger
when other forms of light radiation are
present in a particular application (i.e., use of
cableless control devices on cranes, radiation
from weld spatter or effects from strobe
lights).