Operation Manual
GuardShield Safe 4
As accessories two types of mirrors are available,
with different mounting plates and sizes. Detailed
information
is
available
from
ROCKWELL
AUTOMATION.
4. Principles of operation
The transmitter sends coded infrared light pulses to
the receiver, which evaluates them. If an object e.g.
a finger (14 mm) or a hand (30 mm) penetrates the
protective field, the fully redundant solid state Output
Signal Switching Devices OSSD of the receiver switch
off to stop the machine. As soon as the protective field
is cleared, both outputs switch on again (automatic
restart).
4.1. Mode of operation
GuardShield Safe 4 operates in the guard only mode
with automatic restart. Other modes of operation e.g.
PSDI mode (break mode), muting, external relay
monitoring can be realized using external safety
devices.
4.2. Intelligent Laser Alignment System ILAS
The ILAS is a most convenient feature to make
alignment a pleasure. The ILAS can be activated at
any time during installation or operation. It provides
the possibility to check if the sensor is still perfectly
aligned. In addition it indicates any vibrations at the
mounting base.
4.3. LED indicators
4.4. Perimeter systems
Perimeter systems are usually produced by means of
several single beam light barriers. But the flexibility
of the GuardShield Safe 4 system allows also the
production of vertical entry safeguarding according to
the standard EN 999. Such systems are composed of
active and passive elements in one compact profile.
The active length of each is 120 mm.
POWER
Transmitter
Power on
(orange)
POWER
Receiver
Power on
(orange)
Output active
(green)
Output inactive
(red)
OK
Normal operation
(green)
TEST
Test input
(red)
Optical
(IR light)
Optical
(IR light)
Figure 5: LED Indicators
7
The GuardShield Safe 4 PAC is a multiple beam
safety light curtain designed for perimeter or access
detection around hazardous machinery or equipment.
The Safe 4 PAC is offered in 2 or 3 beam configurations
with 360mm spacing between segments for a 2 beam
pair and 360mm spacing for 3 beam pairs. Both the 2
and 3 beam Safe 4 PACs have a 30 meter operating
range.
The clear front window of the Safe 4 PAC allows for
easy identification of the active sensing modules and
the Integrated Laser alignment system simplifies
the alignment of the Safe 4 PAC in long range and
complex applications.
The GuardShield Safe 4 PAC multi beam safety light
curtain may be used as an optical electronic fence;
detecting the presence of personnel as they pass
through the sensing field or for safe guarding access
to a hazardous area or machine process.
The protective field and the active elements
respectively, are clearly recognized as black surfaces
with the integrated optical lenses. The not monitored
areas (passive elements) are also clearly indicated as
yellow surfaces.
4.5. Muting
Muting of the GuardShield Safe 4 PAC is best
accomplished by connecting the Safe 4 PAC to an MSR
42 multi function safety module. The MSR 42 allows
two muting sensors to be connected for uni directional
muting. The muting sensors can be positioned on the
same side of the Safe 4 PAC in parallel for entry or
exit end muting of a machine process. The two muting
sensors may also be positioned in a crossed or X
configuration for bi directional muting.
Rockwell Automation offers a number of muting
solutions. Check with your local Rockwell Automation
office or Rockwell Automation authorized distributor for
muting application possibilities and muting application
notes.
