Standard No.:	GB/T 17454.2-2017
English Name:	Safety of machinery―Pressure-sensitive protective devices―Part 2:General principles for design and testing of pressure-sensitive edges and pressure-sensitive bars
Chinese Name:	机械安全 压敏保护装置 第2部分：压敏边和压敏棒的设计和试验通则
Chinese Classification:	J09    Hygiene, safety and labor protection
Professional Classification:	GB    National Standard
Issued by:	AQSIQ, SAC
Issued on:	2017-05-12
Implemented on:	2017-12-1
Status:	valid
Superseding:	GB/T 17454.2-2008 Safety of machinery - Pressure-sensitive protective devices - Part 2: General principles for the design and testing of pressure-sensitive edges and pressure-sensitive bars
Language:	English
File Format:	PDF
Word Count:	25000 words
Price(USD):	750.0
Delivery:	via email in 1 business day

1 Scope This part of GB/T 17454 establishes general principles and specifies requirements for the design and testing of pressure-sensitive edges and pressure-sensitive bars used as safeguards and not as actuating devices for normal operation. This part of GB/T 17454 is applicable to pressure-sensitive edges and pressure-sensitive bars, with or without an external reset facility, used to detect persons or body parts that can be exposed to hazards such as those caused by the moving parts of machines. It is not applicable to ——determining the suitability of a pressure-sensitive edge or pressure-sensitive bar for a particular safeguarding application; ——selection of an appropriate performance level (PL) for safety-related parts of control systems (SRP/CSs) other than to give minimum values; ——dimensioning or configuring of the effective sensing area of pressure-sensitive edges or pressure-sensitive bars in relation to any particular application; ——stopping devices according to GB 5226.1 used only for normal operation, including emergency stopping of machinery. Requirements for the information to be provided by the manufacturer are given to assist in the selection of a suitable pressure-sensitive edge or pressure-sensitive bar and its application. Additional requirements can be necessary where pressure-sensitive edges or pressure-sensitive bars are used in locations accessible to elderly or disabled people or children. 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 documents (including any amendments) applies. GB 5226.1-2008 Electrical safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 602041-1:2005, IDT) GB/T 7251.1-2013 Low-voltage switchgear and controlgear assemblies — Part 1: General rules (IEC 61439-1:2011, IDT) GB/T 15706-2012 Safety of machinery — General principles for design — Risk assessment and risk reduction (ISO 12100:2010, IDT) GB/T 16855.1-2008 Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design (ISO 13849-1:2006, IDT) GB/T 16935.1-2008 Insulation coordination for equipment within low-voltage systems — Part 1: Principles requirements and tests (IEC 60664-1:2007, IDT) ISO 4413 Hydraulic fluid power — General rules and safety requirements for systems and their components ISO 4414 Pneumatic fluid power — General rules and safety requirements for systems and their components ISO 13849-2 Safety of machinery — Safety-related parts of control systems — Part 2: Validation IEC 60068-2-6 Environmental testing — Part 2-6: Tests — Test Fc: Vibration (sinusoidal) IEC 60068-2-14 Environmental testing — Part 2-14: Tests — Test N: Change of temperature IEC 60068-2-27 Environmental testing — Part 2-27: Tests — Test Ea and guidance: Shock IEC 60068-2-78 Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state IEC 60529 Degrees of protection provided by enclosures (IP code) IEC 60947-5-1:2003 Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and switching elements — Electromechanical control circuit devices IEC 61000-4-2 Electro-magnetic compatibility (EMC) — Part 4-2: Testing and measuring techniques — Electrostatic discharge immunity test IEC 61000-4-3 Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques — Radiated, radio-frequency, electromagnetic field immunity test IEC 61000-4-4 Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement techniques — Electrical fast transient/burst immunity test IEC 61000-4-5 Electromagnetic compatibility (EMC) — Part 4-5: Testing and measurement techniques — Surge immunity test IEC 61000-4-6 Electromagnetic compatibility (EMC) — Part 4-6: Testing and measurement techniques — Immunity to conducted disturbances, induced by radio-frequency fields IEC 61000-6-2 Electro-magnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity forindustrial environments 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 15706 and GB/T 16855.1 and the following apply. 3.1 pressure-sensitive edge sensitive protective equipment of the “mechanically activated trip” type comprising a sensor (3.3) or sensors and a control unit and one or more output signal switching devices (3.5) intended to detect contact with a person or body part of a person and where the effective sensing surface (3.9) is deformed locally to actuate the sensor(s) Note 1: The sensor or sensors generate(s) a signal when pressure is applied to part of its surface. The control unit responds to the signal from the sensor and generates an output signal(s) to the control system of a machine. Note 2: The length of the sensor(s) is greater than the width. The cross-section throughout the pressure-sensitive area is constant and its width is usually within the range from 8 mm to 80 mm. Note 3: For the definition of sensitive protective equipment see GB/T 15706-2012, 3.28.5. 3.2 pressure-sensitive bar sensitive protective equipment of the “mechanically activated trip” type comprising a sensor (3.3) or sensors and a control unit and one or more output signal switching devices (3.5) intended to detect contact with a person or body part of a person and where the effective sensing surface (3.9) moves as a whole to actuate the sensor(s) Note 1: The sensor or sensors generate(s) a signal when pressure is applied to part of its surface. The control unit responds to the signal from the sensor and generates an output signal(s) to the control system of a machine. Note 2: The length of the sensor(s) is greater than the width. The cross-section throughout the pressure-sensitive area is constant and its width is usually within the range from 8 mm to 80 mm. Note 3: For the definition of sensitive protective equipment see GB/T 15706-2012, 3.28.5. 3.3 sensor part of the pressure-sensitive edge (3.1) or pressure-sensitive bar (3.2) which generates a signal in response to sufficient pressure applied to part of its surface Note: 3.3 to 3.5 define the functional components of a pressure-sensitive edge or pressure-sensitive bar. These functions can be integrated into a single assembly or can be contained in any number of separate assemblies (see Figure 1). For example, a simple pressure-sensitive edge or pressure-sensitive bar actuating a position switch can be considered to be the sensor, the control unit, and the output signal switching device. 3.4 control unit part of the pressure-sensitive edge (3.1) or pressure-sensitive bar (3.2) which responds to the condition of the sensor (3.3) and generates output signals to the machine control system Note: 3.3 to 3.5 define the functional components of a pressure-sensitive edge or pressure-sensitive bar. These functions can be integrated into a single assembly or can be contained in any number of separate assemblies (see Figure 1). For example, a simple pressure-sensitive edge or pressure-sensitive bar actuating a position switch can be considered to be the sensor, the control unit, and the output signal switching device. 3.5 output signal switching device part of the control unit of a pressure-sensitive edge (3.1) or pressure-sensitive bar (3.2) which is connected to the machine control system and transmits output signals Note: 3.3 to 3.5 define the functional components of a pressure-sensitive edge or pressure-sensitive bar. These functions can be integrated into a single assembly or can be contained in any number of separate assemblies (see Figure 1). For example, a simple pressure-sensitive edge or pressure-sensitive bar actuating a position switch can be considered to be the sensor, the control unit, and the output signal switching device. Key: 1——pressure-sensitive edge or pressure-sensitive bar; 2——sensor(s); 3——control unit*; 4——output signal switching device(s)*; 5——part of the machine control system for pressure-sensitive edge or pressure-sensitive bar output signal processing; a——actuating force; b——sensor output signal; c——ON state/OFF state signal; d——manual reset signal**; e——reset signal from machine control system (where appropriate); f——monitoring signals (optional); g——manual reset signal to machine control system***; h——machine control system(s); * Can be located within the machine control system or as part of the machine control system. ** Where appropriate, this may be used as an alternative to g. *** Where appropriate, this may be used as an alternative to d. Figure 1 Systematic sketch of pressure-sensitive edge or pressure-sensitive bar as applied to machine 3.6 ON state state in which the output circuit(s) of an output signal switching device (3.5) is complete and permits the flow of current or fluid 3.7 OFF state state in which the output circuit(s) of an output signal switching device (3.5) is broken and interrupts the flow of current or fluid 3.8 actuating force any force applied to the sensor (3.3) which causes an output signal switching device (3.5) to go to the OFF state (3.7) 3.9 effective sensing surface part of the surface of the sensor (3.3) or a combination of sensors within the effective sensing angle (3.12) and the effective sensing length (3.10) where the application of an actuating force (3.8) creates an OFF state (3.7) in the output signal switching device (3.5) Note: See, for example, Figures 2 and 3. 3.10 effective sensing length length of the effective sensing surface (3.9) 3.11 reference axis line in the direction of the length of the sensor (3.3), whose position in the cross-sectional view of the sensor is used to define the effective sensing surface (3.9) Note: See Figures 2 and 3. 3.12 effective sensing angle angle around the reference axis (3.11) which limits the effective sensing surface (3.9) along the effective sensing length (3.10) Note: See Figures 2 and 3. 3.13 reference direction direction of actuation, from a point on the effective sensing surface (3.9) towards the reference axis (3.11), which bisects the effective sensing angle (3.12) and is perpendicular to the reference axis Note: See Figures 2 and 3. 3.14 dead surface part of the surface area of the sensor (3.3) outside the effective sensing surface (3.9) Note: See Figures 2 and 3. 3.15 pre-travel distance travelled by an object moving in a direction perpendicular to the reference axis (3.11) and in the axis of the applied actuating force (3.8), measured from where this object touches the effective sensing surface (3.9) to where the output signal switching device(s) (3.5) changes to an OFF state (3.7) under specified conditions Note: See Figure 4. 3.16 working travel distance travelled by an object, moving in a direction perpendicular to the reference axis (3.11), from where this object touches the effective sensing surface (3.9), under specified conditions, to where a stated limit force is exerted on the object Note: See Figure 4. 3.17 overtravel difference between the working travel (3.16) and the pre-travel (3.15) when both are measured with the same object applied under the same conditions Note: See Figure 4. 3.18 force-travel relationship relationship between force applied perpendicular to the reference axis (3.11) and the distance travelled by a specified object perpendicular to the reference axis under specified conditions Note: See Figure 4.

Foreword i Introduction iv 1 Scope 2 Normative references 3 Terms and definitions 4 Requirements for design and testing 4.1 Effective sensing surface 4.2 Actuating force for testing 4.3 Pre-travel 4.4 Working travel 4.5 Overtravel 4.6 Force–travel relationships 4.7 Minimum operating speed 4.8 Number of operations 4.9 Sensor output 4.10 Response of output signal switching device to actuating force 4.11 Reset function 4.12 Environmental conditions 4.13 Power supply variations 4.14 Electrical equipment 4.15 Hydraulic equipment 4.16 Pneumatic equipment 4.17 Enclosure 4.18 Additional coverings for sensors 4.19 Access 4.20 Performance levels and categories for SRP/CS in accordance with GB/T 16855.1 4.21 Adjustments 4.22 Sensor fixing and mechanical strength 4.23 Recovery after deformation 4.24 Connections 4.25 Sharp corners, sharp edges and rough surfaces 4.26 Mechanical features 4.27 Inhibition and blocking 5 Marking 6 Information for selection and use 6.1 General 6.2 Essential data for the selection of suitable pressure-sensitive edge or pressure-sensitive bar 6.3 Information for use 7 Verification of requirements 7.1 General 7.2 Test samples 7.3 Test pieces 7.4 Test No. 1 — Safety-related data for selection, installation, commissioning, operation and maintenance of suitable pressure-sensitive edges or pressure-sensitive bars 7.5 Test No. 2 — Mounting orientations of sensors 7.6 Test No. 3 — Actuating force 7.7 Test No. 4 — Force–travel relationship(s) 7.8 Test No. 5 — Number of operations 7.9 Test No. 6 — Output state of sensor and output signal switching device 7.10 Test No. 7 — Response of output signal switching device to actuating force, reset and state of power supply 7.11 Test No. 8 — Environmental conditions 7.12 Test No. 9 — Power supply variation 7.13 Test No. 10 — Electrical, hydraulic and pneumatic equipment 7.14 Test No. 11 — Enclosure 7.15 Test No. 12 — Additional coverings for sensors 7.16 Test No. 13 — Access 7.17 Test No. 14 — Performance Level (PL) according to GB/T 16855.1 7.18 Test No. 15 — Adjustments 7.19 Test No. 16 — Sensor fixing and mechanical strength 7.20 Test No. 17 — Recovery after deformation 7.21 Test No. 18 — Connections 7.22 Test No. 19 — Sharp corners, sharp edges and rough surfaces 7.23 Test No. 20 — Mechanical features 7.24 Test No. 21 — Inhibition and blocking 7.25 Test No. 22 — Marking 7.26 Test No. 23 — Information for selection and use Annex A (Normative) Timing diagrams for pressure-sensitive edges/bars with/without reset Annex B (Informative) Operating speed, force and travel — Explanatory remarks and recommendations Annex C (Informative) Device selection guidance for machinery manufacturer/user Annex D (Informative) Design guidance Annex E (Informative) Application guidance Annex F (Informative) Guidance on commissioning and testing after installation Annex G (Informative) General considerations for systems meeting GB/T 16855.1, category 2 Bibliography