Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
3
GuardShield Type 4 and GuardShield Remote Teach
personnel are within the hazardous area. See the
for an illustration of the protective modes.
Depending on the application, mechanical protection devices can be
required and the safety light curtain.
Proper Use
The GuardShield safety light curtain must be used only as defined in the
Range of Uses of the Device on page 2
. It is only used by qualified
personnel and only on the machine that’s installed and initialized by
qualified personnel.
If the device is used for any other purposes or modified in any way,
warranty claims against Allen-Bradley/Guardmaster become null and
void.
General Protective Notes and Protective Measures
The national/international rules and regulations apply to the
installation, use, and periodic technical inspections of the safety light
curtain, in particular:
• Machine Directive 2006/42/EC
• Low Voltage Directive 2006/95/EC
• The work safety regulations/safety rules
• Other relevant health and safety regulations
Manufacturers and users of the machine with which the safety light
curtain is used are responsible for obtaining and observing all applicable
safety regulations and rules.
• The notices, in particular the test regulations of these
installation instructions (for example, on use, mounting,
installation, or integration into the existing machine controller)
must be observed.
• Specialist personnel or specially qualified and authorized
personnel conduct the tests and record/document the tests to
be sure that they can be reconstructed and retraced at any time.
• The installation instructions must be made available to the user
of the machine where the GuardShield safety light curtain is
installed. The machine operator is to be instructed in the use of
the device by specialist personnel and must be instructed to read
the installation instructions.
Examples of Range of Use
The GuardShield 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 anywhere 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 protective field.
• The restart button must be located outside the hazardous area.
This location removes the possibility of operation by a person
working inside the hazardous area.
• The statutory and local rules and regulations must be observed
when installing and using the device.
Restart interlock is not available in GuardShield light curtains with
ArmorBlock Guard I/O module connectivity.
Product Description
This section provides information on the special features and properties
of the safety light curtain. It describes the structure and functions of the
unit, in particular the different operating modes.
Special Features
• Start interlock
• Restart interlock
• Teachable fixed blanking
• One or two beam floating blanking
• External Device Monitoring (EDM)
• Machine test signal
• Beam coding
GuardShield Light Curtain Principle of Operation
The GuardShield safety light curtain consists of a non-matched pair of
optic units, for instance, transmitter and receiver (see
) with the same protective height and resolution. The transmitter
and receiver operate on +24V DC. The maximum distance between
transmitter and receiver is referred to as the protective field width or
range. The protective field height is the distance between the first and
last beam in the device.
The transmitter emits sequential pulses of infrared light, which the
GuardShield light curtain receives and processes. The first beam next to
the status indicators synchronizes optically the timing of emission and
reception of the infrared light pulses. This beam is referred to as the
synchronization beam. Because the GuardShield light curtain
transmitter and receiver are optically synchronized, no electrical
connection is required between the transmitter and receiver.
The GuardShield light curtain receiver has two safety outputs, Output
Signal Switching Devices (OSSDs) and one nonsafety auxiliary output.
When the GuardShield light curtain transmitter and receiver are
properly powered and aligned, all OSSDs are current so24V
DC with a switching capacity of 500 mA. The two safety OSSDs are
cross monitored and have short circuit protection. Interruption of the
sensing field causes the receiver to switch the sourced current OFF
(0V DC).
IMPORTANT
Observe the following items to be sure the proper and safe use
of the GuardShield safety light curtain.
IMPORTANT
Additional measures can be necessary to be sure that the ESPE
does not fail to danger when other forms of light radiation are
present in a particular application. For instance, with cableless
control devices on cranes, radiation from weld spatter, or
effects from strobe lights use.
IMPORTANT
Read this section before mounting, installing, and
commissioning the unit.
