MT/T 680-1997 English PDF

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MT/T 680-1997: General technical condition of intrinsically safe portable microcomputer for mining

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Basic data

Standard ID: MT/T 680-1997 (MT/T680-1997)
Description (Translated English): General technical condition of intrinsically safe portable microcomputer for mining
Sector / Industry: Coal Industry Standard (Recommended)
Classification of Chinese Standard: D98
Classification of International Standard: 73.100.99
Word Count Estimation: 9,957
Date of Issue: 12/30/1997
Date of Implementation: 6/1/1998
Quoted Standard: GB 191-1990; GB 3836.1-1983; GB 3836.4-1983; GB/T 4942.2-1993; GB/T 5080.7-1986; GB/T 9813-1988; GB/T 13384-1992; MT 209-1990; MT 210-1990
Summary: This standard specifies the technical requirements for non-coal control intrinsically safe portable microcomputer, test methods, inspection rules, marking, packaging, transport and storage. This standard applies to the use of coal mine intrinsically safe portable microcomputer (hereinafter referred to as the computer).

MT/T 6:

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
General technical condition of intrinsically safe portable microcomputer for mining People's Republic of China Coal Industry Standard Intrinsically safe portable microcomputer for mining General technical conditions 1997-12-30 Approved.1998-06-01 Implementation Approved by the Ministry of Coal Industry of the People's Republic of China

Contents

1 Scope 1 2 Normative references 1 3 Technical requirements 1 4 Test method 3 5 Inspection rules 4 6 Marking, packaging, transportation, storage 5

Foreword

This standard strictly complies with GB 3836 "Explosion-proof electrical equipment for explosive environments" series standards and issued by the Ministry of Coal Industry in terms of explosion-proof safety. The "Coal Mine Safety Regulations" (1992 edition), technically in accordance with GB 9813-88 "General Specifications for Micro Digital Electronic Computers", MT 209-90 "Common Technical Requirements for Electrical and Electronic Products for Coal Mine Communication, Detection and Control", MT 210-90 "Mine Communication, Detection, Control Use basic test methods of electrical and electronic products "and other coordination. This standard is proposed by the Department of Science and Education of the Ministry of Coal Industry. This standard is under the jurisdiction of the Standardization Technical Committee for Special Equipment for Coal Mine of the Ministry of Coal Industry. This standard was drafted. Xi'an Branch of China Coal Research Institute. The main drafters of this standard. Jia Shengmao, Zhang Zhongli, Feng Hong. This standard entrusts the Xi'an Branch of the General Research Institute of Coal Science to be responsible for interpretation. Intrinsically safe portable microcomputer for mining General technical conditions

1 Scope

This standard specifies the technical requirements, test methods, inspection rules, signs, Packaging, transportation and storage. This standard applies to intrinsically safe portable microcomputers (hereinafter referred to as microcomputers) used in coal mines.

2 Reference standards

The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. When this standard was published, the editions shown were all Is effective. All standards will be revised, and all parties using this standard should explore the possibility of using the latest versions of the following standards. GB 191-90 Packing, storage and transportation icon GB 3836.1-83 General requirements for explosion-proof electrical equipment for explosive environments GB 3836.4-83 Explosion-proof electrical equipment for explosive environments Intrinsically safe circuits and electrical equipment "i" GB/T 4942.2-93 protection rating for low-voltage electrical enclosures GB/T 5080.7-86 Equipment reliability test Validation test of failure and mean time between failures under the assumption of constant failure rate Program GB/T 9813-88 General specifications for micro digital computers GB/T 13384-92 General technical requirements for packaging of mechanical and electrical products MT 209-90 General technical requirements for electric and electronic products for communication, detection and control in coal mines MT 210-90 Basic test method for electric and electronic products for communication, detection and control in coal mines

3 Technical requirements

3.1 General requirements The microcomputer shall be manufactured in accordance with the requirements of this standard and according to the drawings and documents approved by the prescribed procedures. 3.2 Environmental conditions 3.2.1 The microcomputer should work normally under the following conditions. --- Ambient temperature. generally 0 ~ 4 ℃, if other temperature grades are selected, it should meet the requirements of 4.2 in MT 209; --- Average relative humidity. not more than 95% (25 ℃); --- Atmospheric pressure. 80 ~ 106kPa; --- Where there are explosive mixtures in coal mines, but no corrosive gases that damage the insulation; --- Environment without strong vibration and shock. 3.2.2 The worst storage and transportation conditions that a microcomputer can withstand are. --- High temperature. 60 ℃; --- Low temperature. stipulated by product standards, but not higher than -10 ℃; --- Average relative humidity. 95% (25 ℃); --- Vibration. acceleration 20m/s2; --- Impact. The peak acceleration is 500m/s2. 3.3 Explosion-proof type The microcomputer should be an intrinsically safe type for mining, marked "iⅠ" 3.4 Composition Microcomputer is generally composed of intrinsically safe power supply, microprocessor, memory, input and output interface, system bus, keyboard, display and other parts composition. 3.5 Electrical performance 3.5.1 The technical specifications of the microcomputer shall be specified in the product standard, and generally shall include the following items. --- CPU model, frequency; --- Memory capacity; --- bus type; --- monitor type, color, resolution, size; ---Interface Type; --- Working voltage, working current, etc. 3.5.2 The technical parameters of explosion-proof power supply shall be specified in the product standard, and generally shall include. --- Battery model, capacity and number of cells; --- rated output voltage; --- rated output current; --- the highest open circuit voltage; --- Maximum output current. 3.5.3 When using a rechargeable battery pack for power supply, it shall have the functions of preventing overcharge and overdischarge. 3.5.4 The microcomputer should have a self-test function. 3.5.5 The minimum working time of the whole machine shall be specified in the product standard, and generally shall not be less than 2h. 3.6 Appearance and structure 3.6.1 The shell of the microcomputer shall not be scratched, sunken, deformed or cracked. 3.6.2 Reliable installation of components and reasonable cooperation. 3.6.3 All screws and nuts must be tightened to prevent them from falling off automatically. 3.6.4 All metal parts shall be rust-proofed. 3.6.5 The electrical clearance and creepage distance as well as components and parts shall comply with the relevant provisions of GB 3836.4. 3.6.6 The magnesium content of the aluminum parts used in the enclosure is not more than 0.5%. 3.6.7 Nameplates and signs shall be complete, firm, obvious, clear and beautiful. 3.7 Process requirements The debugged circuit board must be cleaned, and the front and back sides should be coated with three-proof paint at least twice, and the covering layer should be firm and reliable. When using multiple power sources, each power circuit must be arranged separately. Battery packs, current limiting resistors, power boards, etc. should be glue sealed. Adhesive seals shall meet the requirements of GB 3836.4. 3.8 Shell protection The enclosure protection level should not be lower than IP54. 3.9 Electrical safety 3.9.1 The insulation resistance between the live circuit and the enclosure or ground shall comply with the provisions of 11.1 in MT 209. 3.9.2 Between the live circuit and the shell or the ground, it shall withstand twice the intrinsically safe circuit voltage, but not less than 500V power frequency withstand voltage test, and no Flashover and breakdown. 3.10 Surface temperature Under normal or specified fault conditions, the surface temperature of components, wires, and casings must not be greater than 150 ° C. 3.11 Surface insulation resistance When the shell is made of insulating material, its surface insulation resistance must not be greater than 1 × 109Ω. 3.12 Work stability The power-on work shall not be less than 2d, and its electrical performance shall meet the requirements of product standards. 3.13 Environmental adaptability requirements 3.13.1 The microcomputer should be able to pass the high-temperature and low-temperature work tests performed under the conditions specified in Table 1.The electrical performance and appearance of the microcomputer should conform to the product. Provision of standards. Table 1 Test item test temperature, ℃ test time, h recovery time, h High temperature working test maximum working environment temperature 2- High temperature storage test 60 16 2 Low temperature working test minimum working environment temperature 2- Low temperature storage test Minimum storage ambient temperature 16 2 3.13.2 The microcomputer should be able to pass the high-temperature storage and low-temperature storage tests performed under the conditions specified in Table 1. Meet the requirements of product standards. 3.13.3 The microcomputer shall be able to pass the alternating humidity and heat test at 4 ° C and 6d. Its electrical safety, electrical performance and appearance shall meet the requirements of the product standard. Regulations. 3.13.4 The microcomputer should be able to pass the vibration and shock tests in accordance with the requirements of 4.5 in MT 209 in non-working state, and its electrical performance and appearance Should meet the requirements of product standards. 3.13.5 The microcomputer shall pass the drop test 4 times from a height of 1m freely. After the test, there shall be no deformation and damage affecting the explosion-proof performance. And the electrical performance should meet the requirements of product standards. 3.13.6 The packed microcomputer should be able to pass the simulated transport test in accordance with the requirements of 4.5.2 of MT 209. Deformation and damage, the electrical performance and appearance of the microcomputer inside the box should meet the requirements of product standards. 3.14 Explosion-proof requirements 3.14.1 The microcomputer should be able to meet the relevant regulations of GB 3836.1 and GB 3836.4, pass the prescribed tests, and pass the national explosion-proof inspection department. Passed the examination and inspection, and obtained the explosion-proof certificate and the approval certificate of the Ministry of Coal Industry Safety Mark 3.14.2 The connection of the microcomputer with other equipment in the well must pass the explosion-proof inspection. 3.15 Reliability The MT BF of the computer should not be less than.2000h.

4 Test method

4.1 Test conditions Unless otherwise specified in the environmental test or relevant standards, the test shall be performed in the following environmental conditions. --- Temperature. 15 ~ 35 ℃; --- Relative humidity. 45% to 75%; --- Atmospheric pressure. 86 ~ 106kPa. 4.2 Appearance, structure and process inspection In accordance with the relevant provisions of Chapter 5 of MT 210. 4.3 Electrical performance test 4.3.1 The electrical performance test of the microcomputer shall be carried out according to the requirements in 5.3 of GB/T 9813. 4.3.2 The electrical performance of the power supply is tested with instruments such as voltmeters, ammeters, variable resistors. All instruments used should be calibrated, their accuracy is not Below 5 ‰. Specific test methods are specified by product standards. 4.4 Shell protection performance test According to the provisions of Chapters 7 and 8 of GB/T 4942.2. 4.5 Insulation resistance measurement In accordance with the provisions of Chapter 7 of MT 210. 4.6 Power frequency withstand voltage test In accordance with the provisions of Chapter 8 of MT 210. 4.7 Surface temperature measurement In accordance with MT 210 Chapter 11. 4.8 Surface insulation resistance measurement In accordance with the provisions of Chapter 22 of MT 210. 4.9 Work stability test The microcomputer is in working condition, and the running time should meet the requirements of product standards. During the test, replace the battery or Charge, check the electrical performance at the beginning and end of each continuous running working time. 4.10 Low temperature working test In accordance with the provisions of Chapter 23 of MT 210. 4.11 High temperature work test In accordance with the provisions of Chapter 23 of MT 210. 4.12 Low temperature storage test In accordance with the provisions of Chapter 24 of MT 210. 4.13 High temperature storage test In accordance with the provisions of Chapter 24 of MT 210. 4.14 Alternating Humidity Test According to 28.2.1 of MT 210. 4.15 Vibration test In accordance with the provisions of Chapter 25 of MT 210. 4.16 Impact test In accordance with the provisions of Chapter 26 of MT 210. 4.17 Drop test According to the provisions of MT 2.2 15.2.2. 4.18 Transport test In accordance with the provisions of Chapter 27 of MT 210. 4.19 Reliability test According to the provisions of GB/T 5080.7, if there are no other standards, it is recommended to use a timing censoring test scheme, fault criteria and The crediting method is carried out in accordance with the provisions of Appendix B in GB/T 9813, and only the number of related faults is counted. 4.20 Explosion-proof inspection The national explosion-proof inspection agency shall carry out according to the relevant regulations of GB 3836.1 and GB 3836.4.

5 Inspection rules

5.1 General provisions The product must pass the inspections specified in this standard and product standards during the shaping and production process, and obtain the qualification issued by the designated unit. certificate. 5.2 Factory inspection 5.2.1 Each product must undergo factory inspection, and qualified products shall be issued with a product certificate. 5.2.2 The test items are carried out according to the factory inspection contents listed in Table 2. Table 2 Test head technical requirements Quality characteristics Category test method Factory inspection Type inspection Appearance, structure, process 3.6, 3.7 C 4.2 ○ ○ Electrical performance 3.5 A 4.3 ○ ○ Housing protection 3.8 B 4.4-○ High temperature operation 3.13.1 B 4.11-○ High temperature storage 3.13.2 B 4.13-○ Low temperature operation 3.13.1 B 4.10-○ Low temperature storage 3.13.2 B 4.12-○ Damp heat 3.13.3 B 4.14-○ Vibration 3.13.4 B 4.15-○ Impact 3.13.4 B 4.16-○ Transport 3.13.6 B 4.18-○ Drop 3.13.5 B 4.17-○ Power frequency withstand voltage 3.9.2 A 4.6 ○ ○ Insulation resistance 3.9.1 A 4.5 ○ ○ Surface temperature 3.10 A 4.7-○ Surface insulation resistance 3.11 A 4.8-○ Working stability 3.12 B 4.9 ○ ○ Explosion-proof performance 3.14 A 4.20-○ Reliability 3.15 B 4.19-○ Note. "○" indicates the test items that need to be performed. 5.2.3 All indicators of factory inspection must meet the requirements of product standards, and those who have unqualified items shall not leave the factory. 5.3 Type inspection 5.3.1 Type inspection should be carried out in one of the following situations. --- When new products are trial-formed or old products are transferred to production; --- After formal production, such as major changes in structure, materials, and technology may affect product performance; --- When production resumes after one year of suspension; --- Every 3 years during normal production (except for explosion-proof performance); --- When product quality is unstable; --- When the national product quality inspection agency requests a type inspection. 5.3.2 The test items are carried out in accordance with the type inspection content listed in Table 2. 5.1.3 For type inspection, one or two samples shall be taken from the products that pass the factory inspection. 5.3.4 Type inspection decision rules. --- For a category A project, if there is one unqualified item, the batch is judged as unqualified; --- For B-type items, if there is one unqualified item, the sampling inspection shall be doubled. If there is still one unqualified item, the batch shall be judged as unqualified; --- For C projects, if there are 3 unqualified items, the batch will be judged as unqualified. 6 Marking, packaging, transportation, storage 6.1 Signs 6.1.1 Clear and permanent signs "Ex" and safety signs "MA" shall be provided at obvious places of the cabinet. 6.1.2 The microcomputer shall be provided with a nameplate, which shall include. --- product name, model; --- manufacturer name; --- There should be an "Ex" sign at the top right; --- Explosion-proof mark; --- Explosion-proof certificate number and safety mark permit number; --- Technical parameters of the power supply. battery model, working voltage, rated current, maximum open circuit voltage, maximum output current, etc .; --- Factory date and product number. 6.1.3 The pictograms for packaging, storage and transportation shall comply with the provisions of GB 191. 6.2 Packaging 6.2.1 The packaging of the microcomputer should meet the requirements of GB/T 13384, and the specific packaging method is specified by the product standard. 6.2.2 Documents should be included with the box. Random files include. --- Certificate of conformity; ---user's manual; ---Packing List; --- Random spare parts and accessories list; --- Other technical documents specified by the product standard. 6.3 Transport 6.3.1 The packaged microcomputer can be applied to various transportation modes such as water transportation, land transportation and air transportation under the condition of avoiding direct rain and snow. but The ambient temperature during transportation must not exceed the maximum and minimum storage temperatures specified in the product standards. 6.3.2 During transportation, avoid severe vibration and prevent falling. 6.4 Storage The product standards for microcomputers should specify the environmental conditions for storage. When long-term storage may damage components, the inspection period should be specified. ......

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