GB 30439.9-2014Safety requirements for industrial automation products-Part 9: Safety requirements for digit display instrument (English PDF)

3.1 Equipment and devices

3.1.1 Stationary equipment fixedequipment Fixed to the support member or an additional fixture at a specific location. [GB 4793.1-2007, the definition 3.1.1]

3.1.2 PERMANENTLY CONNECTED EQUIPMENT permanentlyconnectedequipment Only permanent connection method and tools to disconnect the electrical power supply connected equipment.

3.2 Parts and Accessories

3.2.1 Terminal terminal A component of the apparatus (device) connected to the outer conductor provided. [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.

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.

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. [IEV151-04-03]

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 1. The instantaneous value is not considered.

Note 2. The open circuit conditions and normal operating conditions are to be considered.

3.4 Test

3.4.1 Type test typetest For a particular design, in order to prove that the design and structure of this standard can meet one or more of the requirements of one or more devices Taiwan sample (or device components) tests carried out.

Note. This is IEV151-04-15 definition expanded to include both the design requirements and structural requirements. [GB 4793.1-2007, the definition 3.4.1]

3.4.2 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). [GB 4793.1-2007, the definition 3.4.2]

3.5 Security Terminology 3.5.1 (Parts) palpable accessible (ofapart)

6.2 When prescribed use standard test finger or test pin to the touch.

3.5.2 Dangerous hazard Potential source of harm.

3.5.3 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.

3.5.4 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.

3.5.5 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.

3.5.6 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.

3.5.7 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.

3.5.8 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.

3.5.9 Normal conditions normalcondition All protective measures to prevent dangerous conditions are intact.

3.5.10 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.

3.6 Insulation

3.6.1 Basic insulation basicinsulation Whose failure can cause a shock hazard insulation. [GB 4793.1-2007, the definition 3.6.1]

Note. The basic function of insulation can be used for insulation purposes.

3.6.2 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]

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

3.6.4 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]

3.6.5 Pollution polution It will lead dielectric strength or surface resistivity reduced solid, liquid or gaseous (ionized gas) additional foreign substances.

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

3.6.6.1 Pollution Level 1 polutiondegree

1 No pollution or only dry non-conductive pollution, the pollution has no adverse effect.

3.6.6.2 Pollution Level 2 polutiondegree

2 Normally only non-conductive pollution, but occasionally due to the cohesive effect and short conductive.

3.6.6.3 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.

3.6.6.4 Pollution degree 4 polutiondegree4 A conductive dust, rain or other wet conditions induced persisting conductive.

3.6.7 Clearance clearance The shortest distance between two conductive parts in the air.

3.6.8 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] The definition of the relevant product 3.7

3.7.1 Installed instruments Fixedly mounted on the dashboard or instrument plane use.

4.4 Test under single fault conditions

4.4.1 Overview It should be according to the following requirements.

a) Check the circuit diagram of the DRO and can usually determine whether the fault condition can cause dangerous and therefore whether it should be implemented;

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 9.1b) and c)];

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

4.4.2 Fault conditions imposed Fault conditions 4.4.2.1 ~

4.4.2.2 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 DRO should be able to apply the test 4.4.4.

4.4.2.1 Impedance protection

a) If the impedance protection is a combination of components to form, it should be shorted or open each component, choose one of the more disadvantaged.

b) If the impedance protection by basic insulation and current limiting pressure limiting device or a combination of the composition, the basic insulation and current limiting or pressure-limiting devices Both of which should bear a single fault condition, once applied to a fault condition. Basic insulation should be short-circuited, while the limit Flow or pressure-limiting devices should be shorted or open, choose one of the more disadvantaged.

c) The protective earthing terminal, if any, should be connected to earth. Functional ground terminal should be grounded or ungrounded. Protection from high impedance component integrity components of the composition need not be shorted or open (see

6.5.3 and 14.2).

4.4.2.2 Power Transformers Power transformer secondary winding should be in accordance with the provisions of 4.4.2.2.1 will be short-circuited, according to the provisions of 4.4.2.2.2 to overload. In one test damaged ...