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SCHNEIDER ELECTRIC
Catalogue:Screw limit switches XRBA and XR2

Catalogue:Screw limit switches XRBA and XR2

Product catalog summary

Screw Limit Switches Overview

Introduction
This document serves as a comprehensive guide on screw limit switches, focusing on the XRBA and XR2 models, which are used in industrial applications to monitor object movement.

Standard Duty Screw Limit Switches (XRBA)

Functions: Used for position control in hoisting equipment and liquid level control in pumping systems.
Operation: Features an input drive shaft, reduction gear, and adjustable cams to actuate contact blocks.
Environment: Complies with IEC/EN 60947-5-1 standards, with a protective treatment and operational temperature range of -25°C to +70°C.
Mechanical Characteristics: Offers various reduction gear ratios and a mechanical durability of 15 million drive shaft revolutions.
Electrical Characteristics: Equipped with single-pole C/O snap action contacts and a conventional thermal current of 10 A.

Heavy Duty Screw Limit Switches (XR2)

Presentation: Designed for demanding applications with higher contact numbers and thermal current ratings.
Characteristics: Similar to XRBA but with enhanced specifications for heavy-duty use.

Differential Drive Units

Presentation and References: Offers additional options for mounting and dimensions.

Selection Guide and Examples

Selection Example: Provides a detailed example of selecting a screw limit switch for monitoring machine part movement, including calculations for reduction gear ratios and cam arrangements.
Liquid Level Control: Includes a table for selecting reduction ratios and chain sprocket sizes based on liquid level changes.

Ordering Information

Order Form: Instructions for completing the order form, specifying the number of contacts, reduction gear ratio, and potentiometer adaptation.

References and Dimensions

Includes detailed references for components and replacement parts, along with dimensional drawings.

Specifications

Conformity to standards: IEC/EN 60947-5-1.
Protective treatment: Standard version “TC”, special version “TH” on request.
Ambient temperature: Storage -40 to +70°C, Operation -25 to +70°C.
Shock resistance: 50 gn (11 ms), Vibration resistance: > 5 gn (10-55 Hz).
Degree of protection: IP 54.
Materials: Aluminium alloy body housing, insulated cover for XR2AA; sheet steel enclosure for XR2AB and XR2BB.

Mechanical Characteristics

Maximum number of turns of threaded shaft: 6.
Threaded shaft screw pitch: 4 mm.
Operating finger radius: 40 mm.
Tripping point repeat accuracy: 0.02%.
Mechanical durability: 10 million drive shaft revolutions.

Electrical Characteristics

Type of contacts: XR2A (single-pole C/O, snap action), XR2B (single-pole N/C or N/O, snap action).
Rated operational characteristics: AC-15, A300 (Ue = 240 V, Ie = 3 A), DC-13, Q300 (Ue = 250 V, Ie = 0.27 A).
Rated insulation voltage: Ui = 500 V (IEC/EN 60947-1), Ui = 600 V (CSA C 22-2 n° 14).
Short-circuit protection: XR2A (10 A cartridge fuse type gG), XR2B (20 A cartridge fuse type gG).

Operation
The switches use a variable composition 2-pinion primary gearbox allowing multiple reduction ratios between the input drive shaft and the threaded shaft. The finger actuators follow a helical path to operate the contacts, with a clutch to prevent damage at the end of travel.

Applications
XR2 screw limit switches are used for position control in hoisting equipment, liquid level control in pumping systems, and monitoring speed differences in differential drive units.

Accessories and Components
The document lists various accessories such as chain sprockets, contact blocks, and differential units, with specifications and ordering references.

Specifications
The document details specifications for chain sprockets and screw limit switches, including bore diameter, teeth numbers, and chain pitch.

Dimensions and Mounting
Dimensions for different XR2 contact models are provided, with variations affecting dimensions c, c1, and G. Mounting details for liquid level control applications are included.

Procedures and Recommendations
The document stresses the importance of risk analysis and testing for specific applications, advising users to ensure product suitability and reliability.

Additional Information
References to additional pages for further details are provided, along with a disclaimer about the general nature of the information and user responsibility for verifying product suitability.

Design and Contact Information
The document is designed by Schneider Electric, with contact information for their head office in France and a website link for further resources.

Catalog excerpts

Screw limit switches

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Screw limit switches XRBA and XR2 Selection guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2 ■ Screw limit switches for standard duty: XRBA □ Presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4 □ Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5 □ References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6 □ Order form . . . . . . . . . . . . . . . . . . . . . . . ....

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Catalogue:Screw limit switches XRBA and XR2-4

Selection guide Screw limit switches Standard duty a or c (Ithe = 10 A) Heavy duty a or c (Ithe = 10 A) Conventional thermal current (Ithe) Single-pole C/O, snap action Single-pole C/O, snap action Reduction gear ratio XRBA4: IP 55 conforming to IEC/EN 60529, IP 557 conforming to NF C 20-010 XRBA6: IP 55 conforming to IEC/EN 60529, IP 555 conforming to NF C 20-010 Cable entry 1 tapped entry for n° 9 cable gland Clamping capacity 5 to 8 mm 1 tapped entry for n° 16 cable gland Clamping capacity 10 to 14 mm 2 tapped entries for n° 13 cable gland Clamping capacity 9 to 12 mm Stainless steel input...

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Catalogue:Screw limit switches XRBA and XR2-5

Heavy duty a or c (Ithe = 10 A) Heavy duty a or c (Ithe = 20 A) Single-pole C/O, snap action Single-pole N/C or N/O, with snap action mechanism Removable gland plate Removable gland plate Sheet steel enclosure Sheet steel enclosure

Open the catalog to page 5

Catalogue:Screw limit switches XRBA and XR2-6

Screw limit switches Standard duty, XRBA Functions These switches are designed to monitor the movement of an object via an input drive shaft coupled to the actuator. Detection of position is ensured by a system of independently adjustable cams which actuate the electrical contact blocks. They are usually used for applications where it is either impossible or impractical to mount standard type position sensors that are actuated directly by the moving object. Main applications: b position control of moving parts of hoisting or materials handling equipment (winches, travelling cranes, gantries,...

Open the catalog to page 6

Catalogue:Screw limit switches XRBA and XR2-7

Screw limit switches Standard duty, XRBA Conformity to standards Protective treatment Standard version Special version Shock resistance Vibration resistance XRBA4pppp: IP 55 conforming to IEC/EN 60529, IP 557 conforming to NF C 20-010 XRBA6pppp: IP 55 conforming to IEC/EN 60529, IP 555 conforming to NF C 20-010 Stainless steel input shaft. Aluminium alloy body housing. Aluminium alloy cover for XRBA4pppp Polyphenylene oxide cover for XRBA6pppp 1 tapped entry for n° 9 cable gland (clamping capacity 5 to 8 mm) and 1 tapped entry for n° 16 cable gland (clamping capacity 10 to 14 mm) Cable entry...

Open the catalog to page 7

Catalogue:Screw limit switches XRBA and XR2-8

Screw limit switches Standard duty, XRBA Screw limit switches Description Basic reference, to be completed (1) XRBA4pppp Screw limit switches (with bare drive shaft) N° 9 plastic, clamping capacity 5 to 8 mm Other Ohmic values Chain sprockets 12.7 mm pitch, for switch input drive shaft Cable glands N° 16 plastic, clamping capacity 10 to 14 mm Contact block Short roller lever actuator 1 C/O snap action contact Separate components and replacement parts XRBA4pppp DE9PL109041 Chains (12.7 mm pitch) conforming to standard NF E 26-101, chromium plated, with joining link (3) XRBZ91p Potentiometers Type...

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Catalogue:Screw limit switches XRBA and XR2-9

Order form Screw limit switches (specimen suitable for photocopying) Standard duty, XRBA Customer Company Schneider Electric Sales Ofce - Subsidiary Co. Delivery date To use this order form: b State the number of identical screw limit switches required b Complete the basic reference with the 5 digits indicating the various switch options b Mark the required cam arrangement on the drawing below. For examples showing completion of the basic reference, refer to pages 8 and 9. Number of identical switches Basic reference, to be completed Reduction gear ratio Drive shaft position Ohmic value of potentiometer...

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Catalogue:Screw limit switches XRBA and XR2-10

Screw limit switches Screw limit switch selection example Standard duty, XRBA Application: monitoring the movement of a machine part Example: Monitoring the movement of a machine part from A to F (AF = 7.5 m) with potentiometer linked display. Chain sprocket on switch input drive shaft: 16 teeth on 12.7 mm pitch. Point A Point B Points C and D Point E Point F Stop position, direction F V A Slow-down position, direction F V A Specic points Slow-down position, direction A V F Stop position, direction A V F Selection of switch and completion of basic reference b Number of contacts: 6 positions to...

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Catalogue:Screw limit switches XRBA and XR2-11

Screw limit switches Screw limit switch selection example Standard duty, XRBA Potentiometer rotation angle Example: Controlling a change in liquid level of 5.30 m Selection of reduction gear ratio From the above table, select the value immediately superior to 5.30 m, i.e. 5.50 m b Case n° 1: without potentiometer. Recommended solution: v Reduction gear ratio: 46/1, chain sprocket with 12 teeth on 12.7 mm (0.0127 m) pitch. v Cam rotation angle: 5.30 × 360 282× 5.30 ° or, by calculation: 12 × 0.0127 using above table: = 272 = 272° 5.50 46 v Completion of basic switch reference: Case n° 2: with...

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Catalogue:Screw limit switches XRBA and XR2-12

Screw limit switches Heavy duty, XR2 Functions These switches are designed to monitor the movement of an object via an input drive shaft coupled to the actuator. Detection of position is ensured by a system of adjustable ngers which actuate the electrical contact blocks. They are usually used for applications where it is either impossible or impractical to mount standard type position sensors that are actuated directly by the moving object. Main applications: b position control of moving parts of hoisting or materials handling equipment (winches, travelling cranes, gantries, cranes, rotary excavators,...

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Catalogue:Screw limit switches XRBA and XR2-13

Screw limit switches Conformity to standards Protective treatment Standard version Special version Shock resistance Vibration resistance XR2AA: Aluminium alloy body housing, insulated cover XR2AB and XR2BB: Sheet steel enclosure XR2AA: 2 tapped entries for n° 13 cable gland (clamping capacity 9 to 12 mm) XR2AB and XR2BB: Removable gland plate Cable entry Maximum number of turns of threaded shaft Threaded shaft screw pitch Operating nger radius Length of developed helical travel Contact actuators differential snap-over angle (measured at nger) Tripping point repeat accuracy Number of turns of...

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