This standard specifies the classification and technical parameters of the electronic control equipment of cantilevered roadheaders. This standard applies to electronic control equipment of cantilevered roadheaders (hereinafter referred to as electronic control equipment). MT/T 682-1997 Series and parameters of electronic control equipment of cantilevered roadheaders MT/T682-1997 Standard download decompression password: www.bzxz.net

MT/T 682—1997
This standard refers to IEC947-1 (1988) in terms of technical indicators and is based on GB/T14048.1—93 "General Principles for Low-voltage Switchgear and Control Equipment"; the writing rules are in accordance with GB/T1.1—1993, and the flameproof and intrinsic safety performance conforms to my country's GB3836-83, and the safety performance conforms to my country's "Safety Regulations for Coal Mines".
The various technical parameters specified in this standard are the basic guarantee for the safe and reliable operation of cantilever roadheaders. From the date of entry into force of the standard, all types of cantilever roadheader electronic control equipment shall comply with the provisions of this standard. For non-localized electronic control equipment, in addition to complying with its adopted standards, it shall comply with the provisions of this standard in terms of flameproof and intrinsic safety performance. Appendix A of this standard is the appendix of the standard. This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. The drafting unit of this standard: Xuzhou Coal Mine Machinery Factory. The main drafter of this standard is Tao Xueyi.
This standard is interpreted by the Excavation Machinery Branch of the Coal Mine Special Equipment Standardization Committee. 298
1 Scope
Coal Industry Standard of the People's Republic of China
Series and parameters of electric control equipments for boom roadheaders This standard specifies the classification and technical parameters of electric control equipments for boom roadheaders. This standard applies to electric control equipments for boom roadheaders (hereinafter referred to as electric control equipment). 2 Referenced standards
MT/T 682--1997
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB3836.183 General requirements for explosion-proof electrical equipment for explosive atmospheres Explosion-proof electrical equipment for explosive atmospheres Flameproof electrical equipment "d" GB 3836. 2--83
Explosion-proof electrical equipment for explosive atmospheres Increased safety electrical equipment "e" GB 3836.3--83
Explosion-proof electrical equipment for explosive atmospheres Intrinsically safe circuits and electrical equipment "i" GB 3836. 4—83
GB/T14048.1—93 General provisions for low-voltage switchgear and controlgear MT154.2—1996 Method for compiling models of electrical control equipment for coal mining working faces MT 209--90
MT 210—90
MT 238--91
3 Symbols and codes
3.1 Symbolsbzxz.net
General technical requirements for electrical and electronic products for coal mine communication, detection and control Basic test methods for electrical and electronic products for coal mine communication, detection and control General technical conditions for cantilever roadheaders
The main symbols appearing in this standard are as follows: a) U.: rated working voltage;
b) U: rated insulation voltage;
c) I.: rated working current;
d) cost: power factor.
3.2 Codes
The codes for the use categories appearing in this standard are as follows: a) AC-3 starting and disconnection during operation of AC squirrel cage induction motors; b) AC-4 starting, reverse braking or reverse operation, and inching of AC squirrel cage induction motors. 4 Classification and naming
4.1 Classification
Approved by the Ministry of Coal Industry of the People's Republic of China on December 30, 1997 and implemented on June 1, 1998
4.1.1 By power
MT/T 682—1997
Electronic control equipment can be divided into the following categories according to the power of the cutting motor it controls: a) extra light; b) light; c) medium; d) heavy. The types and basic parameters of electronic control equipment are shown in Table 1. Table 1 Type and basic parameters Basic parameters Power of controllable cutting motor, kW Rated working voltage, V Rated frequency, Hz Arc extinguishing medium Maximum working slope (absolute value), (°) Protection Operation mode Rated working system 4.1.2 According to the explosion-proof category of control circuit 380, 660 Air, vacuum 90~110 660, 1140 Air, vacuum t||132～200
660,1140
Main circuit leakage lockout, control circuit leakage protection, motor overheat protection, overload protection, short circuit protection, phase failure protection
a) Manual operation main command operation box (flameproof type) Centralized control electric control box (explosion type); b) Manual operation main command operation box (intrinsic safety type) Centralized control electric control box (flameproof and intrinsic safety type) Electric control box is 8h working system
AC-3 load operation frequency is 300 level
Electronic control equipment can be divided into: a) intrinsic safety type;
b) explosion type.
4.1.3 According to arc extinguishing medium
Electrical control equipment can be divided into:
a) air;
b) vacuum;
c) air, vacuum.
4.2 Naming
The product models of the electric control box, main command operation box and other electric control equipment are specified by the enterprise standards, but shall comply with the provisions of MT154.2. 5 Technical parameters
5.1 Basic parameters
5.1.1 The basic parameters of the electric control equipment shall comply with the provisions of Table 1. 5.1.2 The overall dimensions and weight of the electric control equipment shall comply with the standards of each enterprise. 5.2 Working conditions
Electronic control equipment should operate normally under the following specified conditions: a) Ambient air temperature -5℃ ~ +40℃; b) The altitude of the installation site shall not exceed 2000m; c) The relative humidity of the ambient air shall not exceed 90% (+25C); d) An environment without gas or steam that destroys insulation; e) A place that can be prevented from dripping;
f) A place with significant vibration and impact;
MT/T 682-
—1997
g) The installation inclination with the horizontal plane shall not exceed 16%; h) In a mine containing explosive mixtures such as gas; i) Pollution level 3, installation category II. 5.3 Basic structure
Electrical control equipment consists of the following parts:
a) Electric control box;
b) Main command operation box;
c) Lighting lamp;
d) Buzzer;
e) Emergency stop button.
5.4 Structural performance
5.4.1 Flameproof and intrinsic safety performance
The flameproof shell material of the electric control equipment, the structural parameters of the flameproof joint surface, the protection level of the intrinsic safety shell, and the explosion-proof performance of the cable entry device, observation window, rubber parts, seals, connectors, etc. shall comply with the relevant provisions of GB3836.1~3836.4 respectively, and shall pass the inspection of the national designated explosion-proof inspection agency and obtain the explosion-proof certificate. 5.4.2 Electrical clearance and creepage distance
The electrical clearance and creepage distance in the main cavity of the electric control equipment shall comply with the provisions of 7.1.3.1 and 7.1.3.2 of GB/T14048.1; the electrical clearance and creepage distance in the wiring cavity shall comply with the provisions of Chapter 5 and Chapter 6 of GB3836.3. The electrical clearance and creepage distance of the intrinsically safe circuit shall comply with the relevant provisions of 4.6 of GB3836.4. 5.4.3 Mechanical interlocking
A reliable mechanical interlocking shall be provided between the isolating switch and the flameproof enclosure in the electric control box to ensure that the shell cover cannot be opened when the isolating switch is in the closed position. The shell fastened with bolts may be replaced by a warning sign, which shall be marked with the words "Open the cover after power off". 5.4.4 Indication
The electric control box shall be equipped with a position indicator to show the closed and open positions of the isolating switch contacts. 5.4.5 Grounding
The protective grounding of the electric control equipment shall comply with the provisions of Chapter 15 of GB3836.1. 5.4.6 Moisture and heat performance
The moisture and heat resistance of the electric control equipment shall comply with the provisions of Chapter 28 of GB3836.1, and the test cycle is 12 days. 5.5 Dielectric performance
5.5.1 Main circuit and control circuit
The main circuit and control circuit of the electric control equipment shall respectively withstand the AC 50Hz power frequency test voltage specified in Table 2 for 1 minute without breakdown and flashover.
Table 2 Power frequency withstand voltage
Rated insulation voltage U
60
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