3.1.2 Examples: Inappropriate Applications
Do not use EZ-SCREEN LPM in the following applications:
•
With any machine that cannot be stopped immediately after a stop signal is issued, such as single-stroke (or full-
revolution) clutched machinery
• With any machine with inadequate or inconsistent machine response time and stopping performance
• With any machine that ejects materials or component parts through the defined area
•
In any environment that is likely to adversely affect photoelectric sensing efficiency. For example, corrosive
chemicals or fluids or unusually severe levels of smoke or dust, if not controlled, may degrade sensing efficiency
• As a tripping device to initiate or reinitiate machine motion (PSDI applications), unless the machine and its control
system fully comply with the relevant standard or regulation (see OSHA 29CFR1910.217, ANSI/NFPA 79, ANSI
B11.19, ISO 12100, IEC 60204-1, IEC 61496-1, or other appropriate standard)
If an EZ-SCREEN LPM is installed for use as a perimeter guard (where a pass-through hazard may exist, see
Reducing or
Eliminating Pass-Through Hazards
(p. 21)), the dangerous machine motion can be initiated by normal means only after the
safeguarded area is clear of individuals and the EZ-SCREEN LPM has been manually reset.
3.1.3 Control Reliability: Redundancy and Self-Checking
Redundancy requires that EZ-SCREEN LPM circuit components be backed up to the extent that, if the failure of a single
component will prevent effective machine stopping action when needed, that component must have a redundant
counterpart which will perform the same function. The EZ-SCREEN LPM is designed with redundant microprocessors.
Redundancy must be maintained whenever the EZ-SCREEN LPM is in operation. Because a redundant system is no longer
redundant after a component has failed, EZ-SCREEN LPM is designed to monitor itself continuously. A component failure
detected by or within the self-checking system causes a stop signal to be sent to the guarded machine and puts the EZ-
SCREEN LPM into a Lockout condition.
A recovery from this type of Lockout condition requires:
• Replacement of the failed component (to restore redundancy)
• The appropriate reset procedure
The Diagnostic Display is used to diagnose causes of a Lockout condition. See
Troubleshooting
(p. 76).
3.2 Features
• A two-piece optoelectronic safeguarding device with integrated muting
function
•
Eight different pre-defined muting configuration options, including Bypass,
Mute-Dependent Override, Mute Enable, and Mute-Cycle time extension (4
seconds) for "L"-style cell exit applications
•
Mute Lamp and Status Outputs to EZ-LIGHT
®
(or other indicating devices)
with RD cordsets and accessory end-cap mounting bracket
• Creates a screen of synchronized, modulated infrared sensing beams that
extend from end-to-end of the housing (no "dead" zone)
• Low-profile
compact package for smaller production machines, robust for
large power presses
• 14 mm or 25 mm resolution; defined areas from 410 to 1250 mm (16.1 in to
49.2 in)
•
100 mm to 7 m (4 in to 23 ft) sensing range
• Reduced resolution and fixed blanking is easily configured.
• Zone and Status indicators plus digital display to indicate number of beams
blocked, detailed diagnostics
•
FMEA tested to ensure control reliability
• Highly immune to EMI, RFI, ambient light, weld flash, and strobe light
•
External device monitoring
• Vibration-tolerant, factory burned-in emitter and receiver circuitry for
toughness and dependability
• Selectable Aux/Fault output option to monitor the state of the OSSDs or
monitor receiver lockouts
• Selectable emitter test option simulates a "blocked" condition
• Safety PLC input compatible (per OSSD specifications)
EZ-SCREEN Low-Profile System with Integral Muting
10 www.bannerengineering.com - Tel: + 1 888 373 6767
To Next Page
Loading...