Table of Contents
GuardShield™ Safe 2 Safety Light Curtain User Manual
Type 2 applications up to safety category 2 (EN 954)/SIL2/SIL CL2
(EN 61508/EN 62061) and PLd (EN ISO 13849-1). This device is
suitable for:
• Point of operation protection (hand protection)
• Hazardous area protection
• Access protection
Access to the hazardous point must be allowed only through the
protective field. The machine/system is not allowed to start as long as
personnel are within the hazardous area. Refer to the "Examples of
Range of Use" on page 5 for an illustration of the protection modes.
Depending on the application, mechanical protection devices may be
required in addition to the safety light curtain.
Proper Use
The GuardShield Safe 2 safety light curtain must be used only as defined
in the "Range of Uses of the Device." It must be used only by qualified
personnel and only on the machine where it has been 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 shall become null
and void.
General Protective Notes and Protective Measures
Safety Notes
IMPORTANT
Please observe the following items in order
to ensure the proper and safe use of the
GuardShield Safe 2 safety light curtain.
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
• Use of Work Directive (2009/104/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 (e.g. on use, mounting, installation or integration into the
existing machine controller) must be observed.
The tests must be carried out by specialist personnel or specially qualified
and authorized personnel and must be recorded and documented to
ensure that the tests can be reconstructed and retraced at any time.
The installation instructions must be made available to the user of the
machine where the GuardShield Safe 2 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.
4
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.
Please read this section before mounting, installing and commissioning
the unit.
Special Features
• Integrated laser alignment
• Large range with a compact profile
30mm resolution: 0...18 m or 5...30 m
• Tolerant to dust and pollution
• Short-circuit protected semiconductor outputs
• Built-in-diagnostic LEDs
• Optical synchronization, no electrical cable needed between
transmitter and receiver
• Maintenance-free and cost effective
Principles of Operation
The GuardShield Safe 2 safety light curtain consists of a non-matched
pair of optic units, i.e., transmitter and receiver with the same protected
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 are
received and processed by the GuardShield Safe 2 receiver. The
synchronization of the timing of the emission and reception of infrared
light pulses is accomplished optically by the first beam adjacent to the
GuardShield Safe 2 status LEDs. This beam is referred to as the
synchronization beam. Because the GuardShield Safe 2 transmitter and
receiver are optically synchronized, no electrical connection is required
between the transmitter and receiver.
The GuardShield Safe 2 receiver has two safety outputs, Output Signal
Switching Devices (OSSDs). When the GuardShield Safe 2 transmitter
and receiver are properly powered and aligned, all OSSDs are current
sourcing +24V DC with a switching capacity of 300 mA. The two safety
OSSDs are cross monitored and short-circuit protected. Interruption of
the sensing field causes the receiver to switch the sourced current OFF
(0V DC).
Restoring the GuardShield Safe 2 sensing field causes all outputs
(OSSDs) to switch to the active high state (resume current sourcing
+24V DC with a switching capacity of 300 mA).
GuardShield Safe 2 operates in the guard only mode with automatic
restart. Other modes of operation e.g. PSDI mode (break mode),
muting, external relay monitoring (EDM) can be realized using external
safety devices.
The GuardShield Safe 2 safety light curtain consists of a transmitter and
a receiver.
Original instructions
R
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