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Figure 1: Components of the GuardShield Type 2
The upper and lower limit of the protective field is shown by markings
on the housings.
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 (18 m...30 mm (59.0 ft...1.18 in.)).
Examples of Range of Use
The GuardShield Type 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.
Additional measures may be necessary to
IMPORTANT
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).
The protective system must be tested for
IMPORTANT
proper operation after each and every
change to the configuration.
Guard Only
When in the guard only mode of operation, the light curtain operates as
an on/off device, meaning the OSSD outputs switch off/on according to
an obstruction or clearing of the detection field.
Start Interlock
The start interlock is designed to protect against the OSSD outputs from
switching to ON state after power up of the system with the protective
field unobstructed. A manual reset of the system is required for the
GuardShield Type 2 to enter the ON state.
This can be accomplished by one of two methods.
• Actuation of a momentary N.O. push button
• Interruption and restoration of the protective field within one
second.
GuardShield™ Type 2 Safety Light Curtain Installation Instructions
GuardShield Type 2 is factory ordered with this functionality. Indication
of this mode of operation is through illumination of a yellow LED on the
GuardShield Type 2 receiver.
Restart Interlock
The restart interlock mode of operation is designed to protect against the
OSSD outputs from switching to ON after interruption and clearance of
the protective field. A manual reset of the GuardShield Type 2 system is
required. Resetting of the system is accomplished through a momentary
N.O. push button or key switch. The restart interlock mode is indicated
by the illumination of a yellow LED on the GuardShield Type 2 receiver.
GuardShield Type 2 is factory ordered with this functionality.
Relay Monitoring (MPCE/EDM)
The relay monitoring function is an input signal to the GuardShield
Type 2 receiver and is used to monitor the state of the protected
machinery's primary control contactors or other final switching device.
Detection of unsafe conditions such as welded contacts, cause the
GuardShield Type 2 to enter a lockout condition (OSSDs OFF).
System Testing
The GuardShield Type 2 performs a complete system self-test at power
up and switches to the ON state if the system is properly aligned and the
protective field is unobstructed. If the start/restart interlock version is
used, a reset is required to switch to a "green" state.
External Test (Machine Test Signal)
A test cycle of the system can be triggered by an external test signal to the
GuardShield Type 2 transmitter. Supplying or removing a signal (+24V
DC) via a N.C. or N.O. switch at the test input deactivates the
transmitter for the duration of the test signal, simulating an interruption
of the protective sensing field.
Response Time
The response time of the GuardShield Type 2 safety light curtain
depends on the height of the protective field, the resolution and the
number of light beams as well as the coding of the system.
Resolution [mm
(in.)]
30 (1.18)
30 (1.18)
30 (1.18)
30 (1.18)
30 (1.18)
30 (1.18)
30 (1.18)
30 (1.18)
30 (1.18)
30 (1.18)
30 (1.18)
Original instructions
Protective
Height [mm
Number of
Response Time
(in.)]
Beams
w/o Coding
160 (6.3)
8
20 ms
320 (12.5)
16
20 ms
480 (18.8)
24
20 ms
640 (25.1)
32
20 ms
800 (31.4)
40
20 ms
960 (37.7)
48
20 ms
1120 (44.0)
56
20 ms
1280 (50.3)
64
20 ms
1440 (56.6)
72
20 ms
1600 (62.9)
80
20 ms
1760 (69.2)
88
20 ms
Response Time
w/Coding
30 ms
30 ms
30 ms
30 ms
30 ms
30 ms
30 ms
30 ms
30 ms
30 ms
30 ms
5
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