What are limit switch arms and actuators used for?
Limit switches are used to detect the physical presence or position of objects in industrial environments. Replacing a worn-out actuator or lever arm helps extend the life and improve the accuracy of your limit switches. Choose adjustable or fixed lengths when you shop for limit switch arms and actuators at Grainger.
What can a limit switch be used for?
They are used for control of a machine, as safety interlocks, or to count objects passing a point. Standardized limit switches are industrial control components manufactured with a variety of operator types, including lever, roller plunger, and whisker type. Limit switches may be directly mechanically operated by the motion of the operating lever.
What is the limit switch on a crane?
Load limit switch used on hoist and trolley.Traveling limit switch control the travel of the working machine, while the limit switch control the position of the working machine, and often the terminal position or limit position. Limit switches on crane usually cut the power to the drive motor when the crane moves beyond the travel limit.
Where is the limit switch on a hoist?
The stopper is installed on the lifting motor junction box for upper and lower limit protection of the hoisting mechanism. Its working principle is as follows: the wire rope guide board pushes the guide rod and then drives the fire limit switch to cut off the power of the lifting motor.
How is limit switch used on Crane and hoist?
Traveling limit switch used both on crane and hoist or trolley. Load limit switch used on hoist and trolley.Traveling limit switch control the travel of the working machine, while the limit switch control the position of the working machine, and often the terminal position or limit position.
What are the limitations of a limit switch?
Limitations of Limit Switches Generally restricted to equipment operating at relatively low speeds. Must make direct contact with target. Moving mechanical parts will wear out. Limit Switch Terminology . Pretravel — the distance or angle that the actuator must go through to trip the contacts
How is an actuator attached to a limit switch?
In some limit switches, the actuator is attached to an operating head which translates a rotary, linear, or perpendicular motion to open or close the electrical contacts of the switch. Switch Body The component containing the electrical contact mechanism. Receptacle/Terminals
When do you need to replace a control arm?
Control arm replacement may also be necessary if the ball joint is worn, because some ball joints cannot be serviced separately. However, even when the bushings and ball joints can be replaced, control arm assemblies that come fitted with these parts can be a boon to repair work.