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• Automation Today
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UPDATE #9

• Summary

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In this issue:

• Economic new compact I/O modules offer ease-of-use
• Softstarter with integrated I/O offers diagnostic and control capability
• Software bundle helps users to manage processes effectively
• Ethernet processor added to PLC-5 controller family
• Add more flexibility and reliability
• Breakers and contactors ready for export to China
• Getting tough with power integrity
• Mini contactors and relays enhance modular control system range
• Broader Terminal Blocks offering allows better solutions
• Data collector for multiple applications suits all users
• New condition-monitoring modules expand predictive maintenance offering
• Fixed-time relay offers low-cost solution
• Extended operator protection for harsh environments
• Miniature proximity sensors are ideal where space is limited
• Flexible, cost effective, closed-loop speed and positional control
• Minotaur MRS300 Modular Monitoring Safety Relays

Greater safety for machine operators

Improved safety provision for machine operators is now available thanks to the introduction of the new Allen-Bradley Guardmaster rear manual release facility for the TLS-GD2 safety interlock switch from Rockwell Automation. The rear manual release provides an easily accessible means of escape for an operator within a guarded area, in the event that a machine is accidentally switched on while its guard door is closed.

Mounted on the underside of the switch, the release is designed to be accessible within a walk-in guarded area. In the event of an emergency condition, it is actuated via a large push-button, which stops the machine and manually unlocks the TLS-GD2 actuator. The machine remains in this condition until the button is released. Power is then restored and the actuator locked, unless, of course, it has already been removed from the switch.

The position of TLS-GD2 manual release means that it is freely accessible and guarding does not have to be specially designed to accommodate it. In addition, by offering four possible actuator entry positions and three possible conduit entries, it is easily integrated into most types of guarding systems. It is designed with a stainless steel actuator entry which protects the switch against poor guard alignment and wear; has onboard locked/unlocked status indication and optional manual key release functions; and provides the highest holding force in its class – at 2,000N.

The TLS- GD2 locks a machine guard door shut until an electrical signal – from a PLC or Allen-Bradley Guardmaster relay timer, for example – allows release. When securely closed, the locking mechanism has been designed to withstand forces in excess of 2,000N. Moreover, with its 100% solenoid rating, the TLS -GD2 will not burn out or reach excessive temperatures. Also, unlike most other locking switches, its unique design means that the force exerted is not directly applied to the solenoid – giving the switch extended life.

Underlining its quality of construction, the TLS-GD2 solenoid lock incorporates monitoring and positive-guided safety contacts (one safety and one auxiliary). These break the safety circuit when the lock is energised (i.e. to release), and provide indication of the switch state. The subsequent removal of the actuator operates two further positive operating safety contacts and an auxiliary or monitoring circuit. This means that the TLS-GD2 can offer OEMs and end-user a total of five available output contacts to monitor guard position, lock engagement and solenoid condition in either dual- or single-channel safety control systems.

The TLS-GD2 manual release version is available in three switching capacities 24, 110 and 230V. In applications that require additional security the safety switch can be used in conjunction with PLCs and relay timers and monitoring relays from Rockwell Automation.