Limit Switch

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limit switch

[′lim·ət ‚swich]
(electricity)
A switch designed to cut off power automatically at or near the limit of travel of a moving object controlled by electrical means.

Limit Switch

 

(or end switch), an electrical device used in switching control circuits of electrical machine drives or their elements at certain points of their motion.

Limit switches are actuated by the motion of the mechanism itself, usually at the end of its travel or at a predetermined point on the path of its motion. For example, in hoisting machinery a limit switch disconnects the motor and applies the brake upon approaching the end point, thus protecting the mechanism from damage. Limit switches may be of the contact or contactless type. According to their design they are classified as pressure (push-button), lever, shaft, and rotary switches.

limit switch

An electric switch, operated by a power-driven machine or by the movement of the car which it drives, which alters or controls the electric circuit associated with the machine, e.g., a switch which slows down and stops an elevator car or dumbwaiter car automatically at or near the top or bottom terminal landing; operates independently of the device which normally controls movement of the car.
References in periodicals archive ?
The units can be used in high production or periodic lifting/positioning applications and incorporate user-friendly, direct acting upper and lower limit switches that can be set in seconds.
That plate would compress the springs onto four limit switches wired to a safety mat control unit, which would stop the molding machine immediately.
Limit switches can take a beating during travel and then they stop working.
The optional microelectric actuator determines accurate positioning without limit switches or supply.
There are two limit switches, zero limit trip switches and the count limit trip switch.
Emerson Process Management has expanded its Smart Wireless solutions family with the release of the Fisher[R] 4320 Wireless Position Monitor with On/Off Control Output Option, which changes the economics of automating discrete valves as an alternative to solenoids and limit switches.
For safety, the saws are equipped with a safety enclosure monitored by limit switches.
The THLS-8000 provides a far superior level of performance than existing electro-mechanical type high limit switches at a competitive price.
Products have IP 66 sealing against dust and heavy seas, internal limit switches, and optional potentiometer feedback.
The Vibracon LVL-B Series vibration limit switches are insensitive to material build-up, external vibration and flow noise, and have no mechanical moving parts for reliable, maintenance-free level sensing.
Options include control and monitoring of sequential valve gates and limit switches that indicate position (open/closed) of the gates.