Rockwell Automation 440L GuardShield Type 4 and Remote Teach User Manual - Manual (Page 8)

GuardShield™ Safety Light Curtain User Manual
6
R
Original instructions
possible to use a standard GuardShield Type 4 POC pair as the last
segment in a cascading system.
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 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.
Restart interlock is not available in GuardShield light curtains with
ArmorBlock Guard I/O connectivity.
GuardShield Laser Alignment
The laser light source in the Integrated Laser Alignment system of the
GuardShield light curtains is a Class 1, eye safe laser diode with a
wavelength of 670 nm.
This Class 1, 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.
Safety Functions
The GuardShield safety light curtain offers a variety of functions,
which are integral to the system.
Operating modes, functions and features of the GuardShield system
are activated through DIP switch settings.
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. The
GuardShield is shipped from the factory configured in Guard only
mode.
Start Interlock
The start interlock prevents 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 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.
Activation of this mode of operation and selection of the resetting
method is through DIP-switch settings. Indication of this mode of
operation is through illumination of a yellow LED on the GuardShield
receiver.
Start interlock is not available on middle and end segments of a
cascading GuardShield system, however, it is possible to configure this
operating mode in the host segment allowing the whole cascading
system to operate in this mode. Start interlock is not available in
GuardShield light curtains with ArmorBlock Guard I/O connectivity.
Restart Interlock
The restart interlock mode of operation prevents the OSSD outputs
from switching to ON after interruption and clearance of the
protective field. A manual reset of the GuardShield system is required.
Resetting of the system is accomplished through a momentary N.O.
push button or key switch. Configuration and activation of this mode
of operation is through DIP-switch settings. The restart interlock
mode is indicated by the illumination of a yellow LED on the
GuardShield receiver.
Restart interlock is not available on middle and end segments of a
cascading GuardShield system, however, it is possible to configure this
operating mode in the host segment allowing the whole cascading
system to operate in this mode.
Restart interlock is not available in GuardShield light curtains with
ArmorBlock Guard I/O connectivity.
Relay Monitoring (MPCE/EDM)
The relay monitoring function is an input signal to the GuardShield
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
to enter a lockout condition (OSSDs OFF). Activation of this mode of
operation is through DIP-switch setting in the GuardShield receiver.
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).
ATTENTION
Use of controls or adjustments or performance
of procedures other than those specified herein,
may result in hazardous radiation exposure.
IMPORTANT
The protective system must be tested for proper
operation after each and every change to the
configuration.