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Rotary Limit Switch

Rotary Limit Switch

Top is a rotary limit switch used to control the movement of industrial machinery. It operates as an auxiliary controller of electrical motors through a power interface, such as a contactor or PLC. Suitable for heavy duty, its shaft is connected to the motor and, after a set number of revolutions, the cams operate the switches, thus starting the predetermined movement. A worm gear and a helical toothed gear combined with one or more pairs of straight toothed gears are used for the transmission of the movement from the input shaft to the output shaft.

Revolution ratios ranging from 1:1 to 1:9400 result from the use of different combinations of gear wheels between the input shaft and the output shaft, which is connected to the cams operating the switches.

Transmission and gear driving shafts are made of stainless steel to prevent oxidation and wear. The gear wheels and the driving bushes are made of self-lubricating techno-polymer material, suitably chosen to reduce wear to a minimum and to maintain the accuracy of the couplings over time.

The base and the cover of the rotary limit switch are made of die-cast aluminium with 20 micron nickel-plating for the standard version and 60 micron for the offshore version (on request). The base features high resistance and has ball bearings optimising the shaft rotation and preventing rubbing.

Materials and components are wear resistant (the offshore version is also saline fog resistant) and protect the equipment against water and dust.

Each cam can be set with great accuracy thanks to the cam adjusting screws. The auxiliary switches are of a positive opening type, thus suitable for safety functions.

The rotary limit switch can be fitted with potentiometers and encoders suitable for the connection to electronic equipment. Each output of the limit switch can be set with a different revolution ratio to allow for a diversified control of the machinery to meet special requirements.

The limit switch is available with a flange for direct coupling to the motor, and it can be customized with labels and colors.