Limit Switch Lever or Weight Operated – Operation, Design & Specifications
Lever (and weight operated)type Limit Switch LLS operates the control change-over contacts of the motor of moving equipment when a cam moving with loads actuates the lever (or, the weight rests on a surface of the limit switch. This to turn the cars on a square shaft and operate the NO/NC change over contact elements.
Operation of Lever or Weight Operated Limit Switch
A two (or more)contact elements are operated by respective rotating cams, which are suitable fixed on a square camshaft turned by a lever (or weight). The contacts operate at + 15° from the central neutral position.
Design of Lever or Weight Operated Limit Switches
The aluminum die-cast body, lever, and cover of the limit switch are finished by powder coating treatment. The camshaft is mounted in the housing on molded Nylon bushes (bearing) are fixed through the front & rear walls.
- Body Material Powder-coated aluminum diecast.
- Degree of protection IP-55 IS 13947 part 1.
- Mounting position Floor mounting.
- Cable Entries Twins, ¾” BS conduit.
- No. of contact 2/3/4.
- Contact Silver-cadmium.
- Wire Connection Screwed Terminals.
- Rated Voltage 500 V ac.
- Thermal Test Current 10A.
The Operating mechanism can be offered in two executions.
- Roller Operating a Lever
Limit Switches are used for E.O.T. Cranes, Wagon shunting devices, elevators, travel mechanisms, or such linearly moving mechanisms to prevent over-travel. The position of operating lever is up-down and can be changed in steps of 90 at the site.
2. Lever Actuated by a Dead Weight
Limit Switches are used to prevent over hoist motion with weight. A counterweight is provided. The same is lifted with wire rope to prevent Over hoist position.
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