The rotary limit switch is 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. Its shaft can be 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 1:15 to 1:1500 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. Each cam can be set with great accuracy thanks to the cam adjusting screws. Overall dimensions are suitable for assembly in narrow spaces.
The auxiliary switches are of the positive opening type.
Base can be equipped with cam sets with a maximum of 4 switches. The limit switch is available with direct control switches to operate directly on the motor.
The limit switch can be fitted with a flange for direct coupling to the motor. Different labels and colors are also available.
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 technopolymer material, suitably chosen to reduce the wear to a minimum and to maintain the accuracy of the couplings over time. Sintered bronze bushes are moulded into the base of the limit switch to optimize the shaft rotation and to prevent rubbing with plastic material.
Materials and components are wear resistant and protect the equipment against water and dust.