Transcription of The Basics of Limit Switches - Electrical and Industrial
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The Basics of Limit Switches - Electrical and Industrial
The Basics of Limit Switches 2 Table of Contents Typical Limit Switch Features and Benefits of Limit Limitations of Limit Limit Switch Limit Switch Actuator/Operating Switch Standard Industrial Actuators and Operating Rotary Lever Typical Plunger Type Electrical Poles, Snap Action vs. Slow Electrical Polarity Single Pole-Double Double Pole-Double Indicating Low Energy Surface Mount Manifold Mounting Side Mounting Special Purpose Limit Neutral Position Two Step Gravity Return Guard Cam Design Lever Arm Plunger Type Wobble Stick and Cat Mounting 3 4 4 4 5-7 5 5 5 5 6 8-9 8 8 9 10-1 2 10 10 10 11 11 12 12 12 13-1 4 13 14 14 15-1 6 15 15 15 16 17-1 8 17 18 18 19 20-2 2 3 Presence Sensing is the act of detecting the presence or absence of an object with a contact or non-contact sensing device.
industrial applications. The term limit switch is derived from the operation of the device it-self. As an object (or target) makes contact with the operator of the switch, it eventually moves the actuator to the "limit" where the elec-trical contacts change state. Through this mechanical action, electrical contacts are either
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