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Difference between revisions of "Safety Guard Locking Switches"
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Safety Guard Locking Switches (view source)
Revision as of 22:59, 21 December 2012
, 22:59, 21 December 2012no edit summary
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This | [[File:Safety guard locking switches.jpg|thumb|right|Safety Guard Locking Switches]] | ||
[[File:Safety guard lock switch1.jpg|thumb|right|Safety Guard Locking Switches]] | |||
'''Safety Guard Locking Switches''' are used to protect hazardous areas where a danger is not immediately removed after a stop request. On many machines removal of power of the motor or actuator will not necessarily cause a reliable and immediate stopping of the dangerous motion. | |||
Gates protected with safety guard locking switches are usually opened on exception basis. For example: to clear a jam or to regularly maintain the machine. This type of switch should not be used for frequent access during normal operation of the machine. | |||
Safety guard locking switches use a solenoid to activate a lock which blocks or releases the tongue from the switch. | |||
==Different types of safety guard locking switches== | |||
===Power to Lock=== | |||
When power is applied to the solenoid, the tongue is locked in the switch. When power is removed, the lock is released allowing the tongue to be extracted from the switch. | |||
===Power to Release=== | |||
When power is applied to the solenoid the lock is released allowing the tongue to be extracted from the switch. When power is removed, the tongue is locked in the switch. | |||
==Applications== | |||
* high inertia rotating machines | |||
* fast rotating machines | |||
* machines where high pressure needs to be released from pneumatic valves. | |||