Load Limiter – Crane Anti-Collision – Electronic Crane Scale 

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Rotary Limit Switches

Base Rotary Limit Switch

Product description

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 1:10 to 1:150 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.

Overall dimensions are suitable for assembly in narrow spaces.  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 the wear to a minimum and to maintain the accuracy of the couplings over time.

Sintered bronze bushes are molded into the base of the limit switch to optimize the shaft rotation and to prevent rubbing with plastic material.

Each cam can be set with great accuracy thanks to the cam adjusting screws. The auxiliary switches are of the positive opening type. The limit switch is available with direct control switches to operate directly on the motor. Materials and components are wear resistant and protect the equipment against water and dust. The limit switch can be customized with labels and colors.

Base is an electromechanical device for low-voltage control circuits (EN 60947-1, EN 60947-5-1) to be used as electrical equipment of machines (EN 60204-1) in compliance with the fundamental requirements of the Low Voltage Directive 2006/95/CE and of the Machine Directive 2006/42/CE.

General Technical Specifications

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  • Conformity to Community Directives: 2006/95/CE 2006/42/CERotary Limit Switch
  • Conformity to Standards:  EN 60204-1 EN 60947-1 EN 60947-5-1 EN 60529
  • Storage ambient temperature: -40°C/+80°C
  • Operational ambient temperature: -40°C/+80°C
  • Protection degree:
    • IP 42
    • IP 67 (Tightening gasket)
  • Insulation category: Class II
  • Maximum rotation speed: 800 rev./min.
  • Cable entry: Cable clamp M16
  • Markings and homologations:

    CE

Technical Specifications of the Microswitches

  • Utilisation category: AC 15

  • Rated operational current: 3 A
  • Rated operational voltage: 250 V
  • Rated thermal current: 10 A
  • Rated insulation voltage: 300 V~
  • Mechanical life: 1×106 operations
  • Terminal referencing: According to EN 50013
  •  Connections: 6.3 mm Faston taps
  • Markings and homologations:

CE & uLc

Rotary Switch Features

 

GF4C Rotary Limit Switch

  • GF4C Rotary Limit SwitchThe 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. 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 1:969, 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 thermoplastic material, suitably chosen to reduce the wear to a minimum and to maintain the accuracy of the couplings over time. Sintered bronze bushes are molded into the base of the limit switch to optimize the shaft rotation and to prevent rubbing with plastic material.
  • 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. It is available with direct control switches for operating directly on the motor. The cam-switch sets can be substituted for potentiometers 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 diversifi ed control of the machinery to meet special requirements.
  • Materials and components are wear resistant and protect the equipment against water and dust. The limit switch is available with a fl ange for direct coupling to the motor and it can be customized with labels and colours according to the customer’s requirementsRotary Limit Switch Specifications.

GF4C Dimensions

GF4C DrawingsGF4C Spare PartsGF4C Spare PartsGF4C Request FormGF4C Use and Maintenance

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