Product category:
Machine Safety Components
News Release from: Rockwell Automation (Allen-Bradley Guardmaster ) | Subject: Lifeline 4
Edited by the Engineeringtalk Editorial
Team on 20 September 2004
Lifeline to long-distance safety
Robust, reliable and cost effective emergency stop provision over extended distances up to 125m is provided by Allen Bradley Guardmaster's new, extended span, Lifeline 4 system.
Robust, reliable and cost effective emergency stop provision over extended distances up to 125m is provided by Allen Bradley Guardmaster's new, extended span, Lifeline 4 system The rope-operated system helps to reduce the number of emergency stops required on extensive plant layouts, providing OEMs and users with an ideal method of achieving operator protection along exposed conveyors and around awkward machinery
This article was originally published on Engineeringtalk on 13 Apr 2001 at 8.00am (UK)
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Ensure rope emergency stop systems work correctly!
Recent research by safety equipment manufacturer, Guardmaster, into the use and installation of rope systems has revealed that some installations could result in a loss of the basic safety function
Rope operated stop switch ideal for conveyors
The combination of Guardmaster's Lifeline 4 rope operated emergency stop switch and universal rope tensioner system solves the problem of setting-up and maintaining protection along exposed conveyors
Designed primarily for use on conveyor lines in the mining, quarrying, food and materials handling industries, the extended span, Lifeline 4 system meets the stringent requirements of EN418 "Safety of machinery - emergency stop equipment", and also conform to EN292, ISO13850, EN60947-5-1, EN60947-5-5 and BS5304.
The system offers users the benefit of four sets of contacts, providing maximum flexibility for auxiliary output, and the choice of two popular conduit entry and entry size options, M20 and 0.5in NPT.
Enclosed within a heavy duty, weatherproof metal case, which is sealed against water and dust ingress (to IP66), the Lifeline 4 switching devices are built to withstand operation in harsh conditions.
Further reading
Safety switches preserve productivity
The SensaGuard will shut down a machine if a failure occurs before there is a demand on the safety device, which improves machine operator safety.
Safety interlock switch adds escape release
Improved safety provision for machine operators is provided by Allen-Bradley Guardmaster's introduction of a new escape release facility for its TLS-GD2 safety interlock switch.
They can be actuated from any position along the wire/rope length providing a constant access emergency stop facility.
This extends even to extreme ends of the rope span, courtesy of a mushroom- headed emergency stop button mounted directly on the Lifeline 4 switch body.
Employing the extended span Lifeline 4 with Guardmaster's unique LRTS tensioning system both simplifies and significantly speeds up the installation of rope operated emergency stop systems.
No special skills or tools are required, yet installations can be set up and operational in minutes.
The effectiveness of these systems can then be maintained - even at maximum span - thanks to a rope status indicator, which is integrated into the body of the Lifeline 4 emergency stop switch.
When correctly installed, a pair of Lifeline 4 switches will serve a safety grab wire of up to 125m in length.
This large span helps to reduce the number of emergency stops required on extensive plant layouts.
It also provides a tripping facility for effecting machine shutdowns and lockouts if an operator should fall or is pushed against the wire rope.
In both cases switching is positive and immediate in response to a definite deflection, and is also largely free of "nuisance tripping", following an extensive testing programme of the Lifeline 4 and the LRTS against the effects of vibration.
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