Top rotary limit switch
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Top rotary limit switch is used to control the movement of industrial equipment. It operates as an auxiliary controller of an electrical motor 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 movements. A worm gear and a helical tooth gear combined with one or more pairs of straight tooth gears are used for transmission of movement from the input shaft to the output shaft.
Top is used on wind turbines to control the nacelle position or the pitch angle of the blades. The motor controlling the rotation of a wind turbine on the yaw axis (or blades around their longitudinal axis) transmits movement to the limit switch. A rotary encoder reads the rotation of the shaft, and its pulses are sent to a PLC which controls the position of the nacelle or blades. The movement of the shaft is also transmitted through a gear motor to a series of cam switches: Appropriate setting of the actuating points of the cams can signal up to four critical positions of the nacelle or blades.
Features
Revolution ratios ranging from 1:15 to 1:1500 are achieved by combining different gears between the input shaft and the output shaft, which are connected to the cams operating the switches. Each output of the limit switch can be set with a different revolution ratio to allow for diversified control of the industrial equipment to meet special requirements. Each cam can be set with great accuracy thanks to the adjusting screws. All switches are of the normally open type, thus suitable for safety functions.
Options
Top can be fitted with different combinations of actuators and motion sensors: Sets of cams and microswitches (max. 12), encoders or potentiometers (max. 3), Yankee 1 absolute encoder for sets of cams and microswitches (max. 3). It is possible to combine different encoders, potentiometers, sets of cams and microswitches, thus creating a device featuring redundancy and diversity.
Materials
Top features transmission and gear driving shafts made of AISI 303 stainless steel, worm gear transmission shaft rotating on ball bearings, as well as self-lubricating technopolymer gears and driving bushings. The base and cover of the rotary limit switch are made of electrostatic varnished die-cast aluminum. Materials and components are wear and saline fog resistant, and protect the equipment against moisture and dust.
Standards - Labelling - Certification
- Conformity to EU Directives:
2006/95/CE: Low Voltage Directive
2006/42/CE: Machinery Directive
- Conformity to standards:
EN 60204-1: Safety of machinery - Electrical equipment of machines
EN 60204-32: Safety of machinery - Electrical equipment of machines - Requirements for hoisting machines
EN 60947-1: Low-voltage switchgear and controlgear
EN 60947-5-1: Low-voltage switchgear and controlgear - Control circuit devices and switching elements - Electromechanical control circuit devices
EN 60529: Degrees of protection provided by enclosures
- Labelling and certification: CE
Basic technical specifications
- Saline fog resistant
- Storage ambient temperature: -40°C/+80°C
- Operational ambient temperature: -40°C/+80°C
- Protection degree: IP 66 / IP 67 / IP 69K
- Insulation category: Class II
- Maximum rotation speed: 800 rpm
- Cable entry: M20 cable clamp
- Labelling and certification: CE SIL 1 (U, c under consideration)
Technical specifications of microswitches
- Utilization category:
AC 15 / 250 V / max. 3 A
DC 13 / 60 V / max. 0.5 A
- Rated thermal current: Max. 10 A
- Rated insulation voltage: 300 V
- Service life: 1,500,000 operations
- Terminals acc. to: EN 50013
- Connections: Screw-type terminals
- Labelling and certification:
PRSL0100XX: CE (general purpose)
PRSL0110XX-PRSL0111XX: CE U (c under consideration)
- PRSL0100XX snap-action contact has 1NO+1NC change-over contact.
- PRSL0110XX snap-action contact has 1NO+1NC change-over contact with double break.
- PRSL0111XX slow-action contact has 1NC contact with double break.
All NC contacts are of the positive opening type.
Top is used on wind turbines to control the nacelle position or the pitch angle of the blades. The motor controlling the rotation of a wind turbine on the yaw axis (or blades around their longitudinal axis) transmits movement to the limit switch. A rotary encoder reads the rotation of the shaft, and its pulses are sent to a PLC which controls the position of the nacelle or blades. The movement of the shaft is also transmitted through a gear motor to a series of cam switches: Appropriate setting of the actuating points of the cams can signal up to four critical positions of the nacelle or blades.
Features
Revolution ratios ranging from 1:15 to 1:1500 are achieved by combining different gears between the input shaft and the output shaft, which are connected to the cams operating the switches. Each output of the limit switch can be set with a different revolution ratio to allow for diversified control of the industrial equipment to meet special requirements. Each cam can be set with great accuracy thanks to the adjusting screws. All switches are of the normally open type, thus suitable for safety functions.
Options
Top can be fitted with different combinations of actuators and motion sensors: Sets of cams and microswitches (max. 12), encoders or potentiometers (max. 3), Yankee 1 absolute encoder for sets of cams and microswitches (max. 3). It is possible to combine different encoders, potentiometers, sets of cams and microswitches, thus creating a device featuring redundancy and diversity.
Materials
Top features transmission and gear driving shafts made of AISI 303 stainless steel, worm gear transmission shaft rotating on ball bearings, as well as self-lubricating technopolymer gears and driving bushings. The base and cover of the rotary limit switch are made of electrostatic varnished die-cast aluminum. Materials and components are wear and saline fog resistant, and protect the equipment against moisture and dust.
Standards - Labelling - Certification
- Conformity to EU Directives:
2006/95/CE: Low Voltage Directive
2006/42/CE: Machinery Directive
- Conformity to standards:
EN 60204-1: Safety of machinery - Electrical equipment of machines
EN 60204-32: Safety of machinery - Electrical equipment of machines - Requirements for hoisting machines
EN 60947-1: Low-voltage switchgear and controlgear
EN 60947-5-1: Low-voltage switchgear and controlgear - Control circuit devices and switching elements - Electromechanical control circuit devices
EN 60529: Degrees of protection provided by enclosures
- Labelling and certification: CE
Basic technical specifications
- Saline fog resistant
- Storage ambient temperature: -40°C/+80°C
- Operational ambient temperature: -40°C/+80°C
- Protection degree: IP 66 / IP 67 / IP 69K
- Insulation category: Class II
- Maximum rotation speed: 800 rpm
- Cable entry: M20 cable clamp
- Labelling and certification: CE SIL 1 (U, c under consideration)
Technical specifications of microswitches
- Utilization category:
AC 15 / 250 V / max. 3 A
DC 13 / 60 V / max. 0.5 A
- Rated thermal current: Max. 10 A
- Rated insulation voltage: 300 V
- Service life: 1,500,000 operations
- Terminals acc. to: EN 50013
- Connections: Screw-type terminals
- Labelling and certification:
PRSL0100XX: CE (general purpose)
PRSL0110XX-PRSL0111XX: CE U (c under consideration)
- PRSL0100XX snap-action contact has 1NO+1NC change-over contact.
- PRSL0110XX snap-action contact has 1NO+1NC change-over contact with double break.
- PRSL0111XX slow-action contact has 1NC contact with double break.
All NC contacts are of the positive opening type.
