GB 30439.4-2013Safety requirements for industrial automation products - Part 4: Safety requirements for control valve (English PDF)

3.2 Parts and Accessories

3.2.1 Terminal terminal A component of the apparatus (device) connected to the outer conductor provided. [IEV151-01-03, revised edition] [GB 4793.1-2007, the definition 3.2.1]

Note. The terminal can contain one or more contacts, so that the term also includes sockets, connectors and the like.

3.2.2 Functional ground terminal functionalearthterminal To a point directly measuring or control circuit, or directly with a shield portion is electrically connected, but also reservations To be used for any function other than safety purposes purpose a ground terminal. [GB 4793.1-2007, the definition 3.2.2]

Note. The measuring equipment, the terminal is often referred to as measuring ground terminal.

3.2.3 Protective Conductor Terminal protectiveconductorterminal For security purposes and conductive parts of equipment are connected, but also with a predetermined external terminal connected to protective earthing system. [GB 4793.1-2007, the definition 3.2.3]

3.2.4 Housing enclosure Protect the unit against certain external influences and prevent parts from any direct contact with the direction provided. [GB 4793.1-2007, the definition 3.2.4]

3.2.5 Baffle barrier Prevent parts from any direction normal close direct contact provided. [GB 4793.1-2007, the definition 3.2.5]

Note. The housing and bezel provides flame spread protection [see 9.2.1b)].

3.3 Electrical values

3.3.1 Rated (value) rated (value) Usually by the manufacturer for the components, apparatus, or device reaches a given magnitude of working status. [GB 4793.1-2007, the definition 3.3.1]

3.3.2 Rating rating A set of ratings and working conditions. [GB 4793.1-2007, the definition 3.3.2]

3.3.3 Operating voltage workingvoltage When the device is supplied at rated voltage, the insulation can occur any particular maximum RMS AC voltage or DC voltage values.

Note. transients are not considered.

Note. The open circuit conditions and normal operating conditions are to be considered. [GB 4793.1-2007, the definition 3.3.3]

3.4 Protection of extra-low voltage circuit Protective extra-low voltage circuits (PELV circuits) protectiveextra-lowvoltagecircuit (PELVcircuit) Under normal operating conditions and single fault conditions, the voltage does not exceed the value of the safety circuit, ground fault, except in other lines. PELV circuit similar to the protective earth connection SELV circuits.

3.5 safety extra-low voltage circuit Safety extra-low voltage circuit (SELV circuit) safetyextra-lowvoltagecircuit (SELVcircuit) Under normal conditions and single fault conditions, the voltage does not exceed the value of the safety circuit, comprising a ground fault in other circuits. NOTE. SELV circuit is not connected to the protective earth.

3.6 Test

3.6.1 Type test typetest For a particular design, in order to prove that the design and structure is able to meet one or more requirements of this part and of one or more devices Taiwan sample (or device components) tests carried out. [GB 4793.1-2007, the definition 3.4.1]

3.6.2 Routine tests routinetest After fabrication or manufacture to determine the means (equipment) meets a criterion and for each separate device (device) test (See Appendix F). [IEV151-04-16, revised edition] [GB 4793.1-2007, the definition 3.4.2]

3.7 Security Terminology 3.7.1 (Parts) palpable accessible (ofapart)

6.2 When prescribed use standard test finger or test pin to the touch. [GB 4793.1-2007, the definition 3.5.1]

3.7.2 Dangerous hazard Potential source of harm. [GB 4793.1-2007, the definition 3.5.2]

3.7.3 Hazardous live hazardouslive Electric shock or electrical burn make it under normal condition or single fault condition.

Note. The value of the normal conditions apply, see 6.3.1, for under a single fault condition is considered to be a higher number apply, see 6.3.2. [GB 4793.1-2007, the definition 3.5.3]

3.7.4 Power supply mains It is designed to make about the device connected thereto need for equipment to provide electricity for the purpose of low voltage power supply system.

Note. Some of the measurement circuit can measure the power grid and for purposes connected with.

3.7.5 The power supply circuit mainscircuit Intended to be connected to the power grid, providing power for the device circuitry.

Note. The measuring circuit and the use of induction powered from the mains power supply circuit circuit does not belong to the grid power supply circuit.

3.7.6 Protective impedance protectiveimpedance A combination of components, component or components of the basic insulation and current limiting or pressure-limiting device when it is connected to ACCESSIBLE conductive parts and dangerous Between live parts when the risk degree of protection impedance, structure and reliability under normal conditions and single fault conditions provided to achieve this standard Requirements. [GB 4793.1-2007, the definition 3.5.7]

3.7.7 Protection connection protectivebonding To make electrical ACCESSIBLE conductive parts or protective screen and for the external protection conductor is connected with electrical continuity and having carried connection. [GB 4793.1-2007, the definition 3.5.8]

3.7.8 Normal use normaluse Operation according to instructions or intended use by the apparent instructions, including standby. NOTE. In most cases, the normal use also refers to normal conditions, because the use of manual warns users not to use the device under abnormal conditions. [GB 4793.1-2007, the definition 3.5.9]

3.7.9 Normal conditions normalcondition All protective measures to prevent dangerous conditions are intact. [GB 4793.1-2007, the definition 3.5.10]

3.7.10 Single fault condition singlefaultcondition Protective measures to prevent the risk of a failure condition occurs or is likely to cause some dangerous and a fault condition.

Note. If a single fault condition will inevitably lead to another single fault conditions, such a two failures are considered a single fault condition. [GB 4793.1-2007, the definition 3.5.11]

3.8 Insulation

3.8.1 Basic insulation basicinsulation Whose failure can cause a shock hazard insulation.

Note. The basic function of insulation can be used for insulation purposes. [GB 4793.1-2007, the definition 3.6.1]

3.8.2 Additional insulation supplementaryinsulation Independent insulation applied in addition to basic insulation, in order to ensure that when once the basic insulation failure can still prevent electric shock. [GB 4793.1-2007, the definition 3.6.2]

3.8.3 Double insulation doubleinsulation Constituted by the basic insulation and supplementary insulation. [GB 4793.1-2007, the definition 3.6.3]

3.8.4 Reinforced insulation reinforcedinsulation Its ability to provide protection against electric shock is not less than double insulation insulation, it can not as a separate image into several layers of additional insulation or basic insulation Insulation test line configuration. [GB 4793.1-2007, the definition 3.6.4]

3.8.5 Pollution polution It will lead dielectric strength or surface resistivity reduced solid, liquid or gaseous (ionized gas) additional foreign substances. [GB 4793.1-2007, the definition 3.6.5]

3.8.6 Pollution degree polutiondegree To assess the level of contamination and the separation distance specified below microenvironment.

Note 1. The build-up of foreign matter and moisture can cause conductive insulator contamination.

Note 2. The minimum clearances for pollution degree Pollution Degree 2 and 3 are given based on experience rather than raw data. [GB 4793.1-2007, the definition 3.6.6]

3.8.6.1 Pollution Level 1 polutiondegree

1 No pollution or only dry non-conductive pollution, the pollution has no adverse effect. [GB 4793.1-2007, the definition 3.6.6.1]

3.8.6.2 Pollution Level 2 polutiondegree

2 Normally only non-conductive pollution, but occasionally due to the cohesive effect and short conductive. [GB 4793.1-2007, the definition 3.6.6.3]

3.8.6.3 Pollution Level 3 polutiondegree

3 Conductive pollution or dry non-conductive pollution due to the unifying role and become conductive.

Note. In this condition, the device is usually to prevent exposure to direct sunlight, rain, strong wind pressure, but it need not control the temperature or humidity. [GB 4793.1-2007, the definition 3.6.6.3]

3.8.7 Clearance clearance The shortest distance between two conductive parts in the air. [GB 4793.1-2007, the definition 3.6.7]

3.8.8 Creepage distance creepagedistance The shortest distance between two conductive parts along the surface of insulating material. [GB 4793.1-2007, the definition 3.6.8]

3.9 and associated product definition

3.9.1 Valve valve Embedded control fluid flow with a pressure closure member seal housing assembly.

3.9.2 Control valve [valve] controlvalve Process control system with the power to change the operating fluid flow means, by the implementing agencies and valves, actuators in accordance with a control signal Changing the position of the valve closure member.

3.9.3 Electric actuator electricalactuator The use of electric power source as the executing agency.

3.9.4 Pneumatic actuator pneumaticactuator The use of pressurized gas as a power source of the actuator.

3.9.5 Locator positioner A valve or actuator associated with mechanical, automatically adjusts the output pressure to the actuator to ensure that the valve position and the input signal with accurate Predetermined position controller relations.

3.9.6 Electrical converters electro-pneumaticconvertor Converter will convert standard DC signal into an electric meter standard pneumatic pressure signal.

4.4 Test under single fault conditions

4.4.1 Overview It should be according to the following requirements.

a) Check the control valve and its circuit diagram is usually able to determine whether there may be dangerous and therefore whether it should be applied to fault condition;

b) In addition to proof of a specific fault conditions likely to cause danger, the test shall be made by the fault, or select Check Verify compliance provisions of an alternative method to replace the fault test [see 9b) and 9c)];

c) the control valve should work under reference test conditions (see 4.3) the most unfavorable combination of conditions, for different faults, which combined strip Member can vary, these combined conditions should be recorded during each test.

4.4.2 Fault conditions imposed Fault conditions 4.4.2.1 ~

4.4.2.8 should include provisions for fault conditions. These fault conditions can only be applied to one and should press Sequentially applied in any convenient order, can not be applied more than one fault at the same time, the results unless it is applied to a fault caused by a fault. After each applied once the fault condition, the control valve or component should pass the applicable test 4.4.4.

4.4.2.1 Protective conductor Protective conductor should be disconnected, but permanent connection control valve or comply with GB/T 11918 ~ GB/T 11919 of the connector Except the control valve.

Note. The pneumatic actuator as a control valve subassembly, this requirement does not apply.

4.4.2.2 short-time or intermittent operation of the control valve or component If the single fault conditions may cause these control valves or parts of continuous work, it should make it work continuously. Each individual Parts including motors, relays and other electromagnetic devices.

Note. The pneumatic actuator as a control valve subassembly, this requirement does not apply.

4.4.2.3 Motor Motor should stop it or prevent it from starting when fully energized and choose one of the more disadvantaged.

Note. The pneumatic actuator as a control valve subassembly, this requirement does not apply.

4.4.2.4 Capacitors Motor auxiliary winding circuit capacitor (except for self-healing capacitors) should be short-circuited.

Note. The pneumatic actuator as a control valve subassembly, this requirement does not apply.

4.4.2.5 Power Transformers The secondary winding of the power transformer should be required to 4.4.2.5.1 will be short-circuited, according to the provisions of 4.4.2.5...