1 General Requirements
The provisions of the general rules in IEC 60947-1 are applicable to this part, where specifically called for. General rules clauses and subclauses thus applicable, as well as tables, figures and annexes, are identified by references to IEC 60947-1, e.g. subclause 7.1.9.3 of IEC 60947-1:2007 + A1:2010 or Annex C of IEC 60947-1:2007 + A1:2010.
Clauses 1 to 8 contain the general requirements. Specific requirements for the various types of proximity switches are given in Annex A.
Integral connectors for plug-in proximity switches are given in Annex D. Various symbols for proximity switches are given in Annex F.
1.1 Scope and Object
This part applies to inductive and capacitive proximity switches that sense the presence of metallic and/or non-metallic objects, ultrasonic proximity switches that sense the presence of sound reflecting objects, photoelectric proximity switches that sense the presence of objects and non-mechanical magnetic proximity switches that sense the presence of objects with a magnetic field.
These proximity switches are self-contained, have semiconductor switching elements(s) and are intended to be connected to circuits, the rated voltage of which does not exceed 250 V 50 Hz/60 Hz a.c. or 300 V d.c. This Standard is not intended to cover proximity switches with analogue outputs.
The object of this part is to state for proximity switches:
— definitions;
— classification;
— characteristics;
— product information;
— normal service, mounting and transport conditions;
— constructional and performance requirements;
— tests to verify rated characteristics.
1.2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2423.4-2008 Environmental Testing for Electric and Electronic Products — Part 2: Test method — Test Db: Damp Heat, Cyclic (12h + 12h Cycle) (IEC 60068-2-30:2005, IDT)
GB/T 2423.22-2012 Environmental Testing for Electric and Electronic Products — Part 2: Test Methods Test N: Change of Temperature (IEC 60068-2-14:2009, IDT)
GB 4824-2013 Industrial, Scientific and Medical (ISM) Radio-frequency Equipment — Electromagnetic Disturbance Characteristics — Limits and Methods of Measurement (CISPR 11: 2010, IDT)
GB/T 17045-2006 Protection Against Electric Shock — Common Aspects for Installation and Equipment (IEC 61140:2001, IDT)
GB 17625.1-2012 Electromagnetic Compatibility — Limits — Limits for Harmonic Current Emissions (Equipment Input Current ≤ 16A Per Phase) (IEC 61000-3-2:2009, IDT)
GB/T 17626.4-2008 Electromagnetic Compatibility — Testing and Measurement Techniques — Electrical Fast Transient/Burst Immunity Test (IEC 61000-1-4:2004, IDT)
GB/T 17626.11-2008 Electromagnetic Compatibility — Testing and Measurement Techniques — Voltage Dips, Short Interruptions and Voltage Variations Immunity Tests (IEC 6100-4-11:2004, IDT)
IEC 60050(441):1984 International Electrotechnical Vocabulary(IEV) — Chapter 441: Switchgear, Controlgear and Fuses
IEC 60050(441):1984/A1:2000 Amendment 1, 2000
IEC 60068-2-6:2007 Environmental Testing — Part 2-6: Tests Test Fc: Vibration (Sinusoidal)
IEC 60068-2-27:200 Environmental testing — Part 2-27: Tests — Test Ea and Guidance: Shock
IEC 60364 (all parts) Low-voltage Electrical Installations
IEC 60947-1:2007 Low-voltage Switchgear and Controlgear — Part 1: General Rules
IEC 60947-1:2007/A1:2010 Amendment 1, 2010
IEC 61000-3-3:2008 Electromagnetic Compatibility(EMC) — Part3-3: Limits — Limitation of Voltage Changes, Voltage Fluctuations and Flicker in Public Low-voltage Supply Systems, for Equipment with Rated Current ≤16 A Per Phase and not Subject to Conditional Connection
Foreword III
1 General Requirements
1.1 Scope and Object
1.2 Normative References
2 Terms and Definitions
2.1 Basic Definitions
2.2 Parts of a Proximity Switch
2.3 Operation of a Proximity Switch
2.4 Switching Element Characteristics
3 Classification
3.1 Classification According to Sensing Means
3.2 Classification According to the Mechanical Installation
3.3 Classification According to the Construction Form and Size
3.4 Classification According to Switching Element Function
3.5 Classification According to Type of Output
3.6 Classification According to Method of Connection
4 Characteristics
4.1 Summary of Characteristics
4.2 Operating Conditions
4.3 Rated and Limiting Values for the Proximity Switch and Switching Elements
4.4 Utilization Categories for the Switching Element
5 Product Information
5.1 Nature of Information — Identification
5.2 Marking
5.3 Instructions for Installation, Operation and Maintenance
6 Normal Service, Mounting and Transport Conditions
6.1 Normal Service Conditions
6.2 Conditions During Transport and Storage
6.3 Mounting
7 Constructional and Performance Requirements
7.1 Constructional Requirements
7.2 Performance Requirements
7.3 Physical Dimensions
7.4 Shock and Vibration
8 Tests
8.1 Kinds of Tests
8.2 Compliance with Constructional Requirements
8.3 Performances
8.4 Testing of Operating Distances
8.5 Testing for the Frequency of Operating Cycles
8.6 Verification of the Electromagnetic Compatibility
8.7 Test Results and Test Report
Annex A (Informative) Typical Dimensions and Operating Distances of Proximity Switches
Annex B (Normative) Class II Proximity Switches Insulated by Encapsulation — Requirements and Tests
Annex C (Normative) Additional Requirements for Proximity Switches with Integrally Connected Cables
Annex D (Normative) Integral Connectors for Plug-in Proximity Switches
Annex E (Normative) Additional Requirements for Proximity Switches Suitable for Use in Strong Magnetic Fields
Annex F (Informative) Symbols for Proximity Switches
Figure 1 Sensing Range and Operating Range of Photoelectric Proximity Switches
Figure 2 Ultrasonic Proximity Switch Operating Distances
Figure 3 Relationship between Operating Distances of Inductive and Capacitive Proximity Switches
Figure 4 Relationship between Operating Distances of Ultrasonic Proximity Switches
Figure 5 Method of Measuring the Operating Distance (8.3.2.1 and 8.4.1)
Figure 6 Test Circuit for the Verification of Time Delay Before Availability
Figure 7 Signal Output Across Load in Figure 6
Figure 8 Test Circuit for the Verification of Minimum Operational Current OFF-state current, Voltage Drop and Independent Snap Action
Figure 9 Test Circuit for the Verification of Making and Breaking Capability
Figure 10 Short-circuit Testing
Figure 11 Testing of the Sensing Range
Figure 12 Methods for Measuring the Operating Frequency of Inductive, capacitive and Non-mechanical Magnetic Proximity Switches (if applicable)
Figure 13 Methods for measuring the operating frequency f, ultrasonic proximity switch
Figure 14 Output Signal of Direct Current Proximity Switch During the Measurement of Operating Frequency f
Figure 15 Measurement Means for Turn-on Time ton and Turn-off Time toff
Figure 16 Turn-on Time ton Measurement
Figure 17 Turn-off Time toff Measurement
Table 1 Classification of Proximity Switches
Table 2 Utilization Categories for Switching Elements
Table 3 Connection and Wiring Identification
Table 4 Verification of Making and Breaking Capacities of Switching Elements Under Normal Conditions Corresponding to the Utilization Categories
Table 5 Verification of Making and Breaking Capacities of Switching Elements Under Abnormal Conditions Corresponding to the Utilization Categories
Table 6 Acceptance Criteria
Table 7 Immunity Tests
Table 8 Test Voltages