Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB5863-91
AC Drive Steel Cord Belt Conveyor
Electrical Control Equipment
Published on October 24, 1991
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on October 1, 1992
Mechanical Industry Standard of the People's Republic of China
Electrical Control Equipment of AC Drive Steel Cord Belt Conveyor JB5863-91
This standard is formulated with reference to the International Electrotechnical Commission IEC439-1 "Low Voltage Switchgear and Control Equipment Devices". 1 Subject Content and Scope of Application
This standard formulates the general requirements for the electrical control equipment (hereinafter referred to as the electrical control equipment) of AC asynchronous motor driven steel cord belt conveyor. It is used as a reference when formulating the technical conditions or standards of the corresponding products. (Regarding various types of products. The requirements they have should be supplemented when formulating technical conditions)
This standard is applicable to the design, production, use and maintenance of electronic control equipment using magnetic control cabinets, tables and boxes in stator and rotor circuits in single-machine and multi-machine transmission systems with an AC rated frequency of 50Hz, a rated voltage of 6kV and below, and a rated capacity of 630kW and below for each motor. 2 Reference standards
GB1497
GB1984
GB1985
GB2681
GB2682
GB3797
GB4208
GB4720
JB3084
JB3085
JB3752
3 Terms
Rated voltage;
Insulation coordination and high voltage test technology for high-voltage power transmission and transformation equipment; Rated current of electrical equipment:
Basic standards for low-voltage electrical appliances ;
AC high voltage circuit breaker;
AC high voltage disconnector;
Wire color in complete electrical equipment:
Color of indicator lights and buttons in complete electrical equipment, basic size series of panels, racks and cabinets; Part II of electric control equipment: Classification of enclosure protection level of electric control equipment equipped with electronic devices;
Electrical control equipment Part I: Low voltage electrical equipment and electric control equipment; Technical requirements for high voltage switch cabinets;
Product packaging and transportation regulations for electric drive control stations; Packaging and transportation regulations for electric drive devices equipped with electronic devices; Method for compiling product models of electric control equipment.
For the terms used in this standard, except for those specified in this standard, please refer to the provisions of relevant standards of GB4720 and GB1497. 3.1 Deviation
The belt of a steel cord belt conveyor (hereinafter referred to as conveyor) deviates from its normal working position. 3.2 Slippage
Relative sliding of the conveyor belt and the transmission roller 3.3 Tearing
The phenomenon of the conveyor belt being torn longitudinally. 3.4 Belt Breakage
Approved by the Ministry of Machinery and Electronics Industry on October 24, 1991 and implemented on October 1, 1992
The phenomenon of the conveyor belt being broken horizontally. 3.5 Reversal
The phenomenon of the conveyor running in the opposite direction to the specified direction. 4 Product Classification
4.1 Classification by the rated voltage of the main traction motor a. High-voltage motor electronic control equipment;
b. Low-voltage motor electronic control equipment.
4.2 Classification by the number of main traction motors
a. Single-machine traction electronic control equipment;
b. Double-machine traction electronic control equipment;
c. Three-machine traction electronic control equipment;
d. Four-machine traction electronic control equipment.
4.3 Classification by main traction motor typewwW.bzxz.Net
a. Wound-type motor traction electronic control equipment; b. Squirrel cage motor traction electronic control equipment. 4.4 Classification by electronic control equipment structure
a. Desktop electronic control equipment:
b. Box-type electronic control equipment;
c. General cabinet-type electronic control equipment;
d. Drip-proof electronic control equipment;
e. Dust-proof and drip-proof electronic control equipment.
4.5 Other classifications
JB5863-91
Other classifications of products can be negotiated by the manufacturer and the user. Classification based on control mode, main traction motor capacity, tensioning mode, etc. 4.6 Naming of product models
The product model consists of five parts: category representative A, series code K, variety number, specification number and additional code. Its meaning is as follows: A
Additional code: G——Fixed tension
Z——Automatic tension
Specification code: See Table 1
Variety number: An——Without electric brake (A can be omitted) B—With electric brake
Series design number. 1, 2, 3.*, indicating the 1st, 2nd, 3rd...design. (1 can be omitted)
Series characteristic code, indicating electric control equipment
Category code, indicating specification code of AC transmission steel rope core belt conveyor
First digit
Second digit
Third digit
Fourth digit
1 Single-machine drag
2 Double-machine drag
3 Three-machine drag
4 Four-machine drag
D Low voltage
G High voltage
O Squirrel cage motor
JB5863-91
1 Wound-rotor motor with additional frequency-sensitive rheostat start 2--Second-stage switching rotor additional 5-Wound-rotor motor with five-level switching rotor and additional resistance 6-Wound-rotor motor with six-level switching rotor and additional resistance 0-Direct start
1-Reduced voltage start
2-Rotor rated current 250A
3-Rotor rated current 315A (300A)
4-Rotor rated current 400A
5-Rotor rated current 500A
6-Rotor rated current 630A (600A)
8-Rotor rated current 800A (750A)
Note: The series models of the cabinets, boxes and platforms of the same set of electric control equipment should be consistent. The models of each single cabinet, box and platform can be simplified and compiled separately according to the provisions of JB3752. Technical requirements
Use conditions
5.1.1 Environmental conditions shall not exceed the following provisions: The maximum temperature of the surrounding air shall not exceed 1040℃. And the average temperature within 24 hours shall not exceed +35℃. The minimum temperature shall not be lower than a.
-10℃:
The altitude of the installation site shall not exceed 2000m. However, for electronic control equipment containing electronic devices used at an altitude of more than 1000m but less than 2000m, the reduction of dielectric strength and the weakening of air cooling effect should be considered, so the agreement and requirements between the manufacturer and the user must be met.
The relative humidity of the air shall not exceed 50% when the ambient air temperature is +40℃. A higher relative humidity can be allowed at a lower ambient temperature. For example, 90% at +20℃. However, it should be noted that when the temperature changes too quickly, condensation may occur. d. The installation environment of the electronic control equipment should be free of severe vibration. For large-capacity contactors, circuit breakers, and installation cabinets, the allowable vibration conditions for the installation foundation are: the vibration frequency range is 10-150Hz, and the maximum vibration acceleration should not exceed 5m/s. e. There is no conductive dust, gas and particles that can corrode metals and destroy insulating materials. There is no rain, snow and strong electromagnetic fields. However, electric control equipment is allowed to have different special working environments and needs to comply with the provisions of GB4208 and the product technical documents of the electric control equipment itself only after the effective use of casing, protective coating or sealed shielding. f. For vertically installed electric control equipment, the installation inclination shall not exceed 5°5.1.2 The quality of the power grid must comply with the relevant provisions of GB3797. 5.1.3 Special use conditions that do not meet the requirements of Articles 5.1.1 and 5.1.2 shall be agreed upon separately by the user and the manufacturer when placing an order. 5.2 Basic requirements
5.2.1 Electric control equipment shall be designed and manufactured in accordance with the requirements of this standard and the drawings and documents approved in accordance with the prescribed procedures. 5.2.2 The components of the electronic control equipment should be selected in accordance with the specified design quota, protection requirements and reliability needs, and the accessories that meet the requirements of GB1497, GB1984, GB1985, etc. should be correctly selected. The selected semiconductor devices must be strictly screened. The screening requirements are shown in Table 2. Under special circumstances, users and manufacturers can agree separately.
Screening project name
High temperature storage
High and low temperature cycle
Normal temperature test
High and low temperature test
Power aging
Screening test requirements
Store at the allowable junction temperature of the component for 24h
Test according to the high and low temperature cycle test requirements of GB3797
Test according to the high and low temperature test conditions specified by the component
Aging according to the rated power of the component is not less than 8h
If there is no provision for the junction temperature of the component, store it at the temperature specified by the high temperature test of the component for 24h
Equipment with special requirements for component parameters. In the product drawings and documents, the rated voltage and rated current of the circuit of the electronic control equipment shall comply with the provisions of GB156 and GB762 respectively. In special cases, the internal circuit voltage of the system is allowed to be agreed upon by the user and the manufacturer. 5.2.4 The color of the wires selected for the electronic control equipment shall comply with the provisions of GB2681, and the rated insulation voltage shall be compatible with the rated voltage of the circuit.
5.2.5 The cutting surface of the wires selected for the electronic control equipment shall be selected according to the specified current carrying capacity. However, considering the requirements of mechanical strength, a single-strand copper core insulated wire of not less than 0.75mm or a multi-strand copper core twisted insulated soft wire of not less than 0.5mm shall be used. The minimum cross-section of the wire for weak current lines (such as electronics, integrated circuits, etc.) shall not be less than 0.2mm. The wires connected to the components that generate vibrations themselves (such as vibrations generated by the opening and closing of high-power contactors, etc.) shall use multi-strand copper core twisted insulated soft wires of not less than 1.5mm. 5.2.6 When the electric control equipment is a multi-machine transmission system, in addition to taking appropriate measures in terms of electromechanics to ensure that the output power of each motor is close to balance, the design of the system should also take into account when ordering the equipment: multiple motors must be of the same model and the same batch of products, and the motor manufacturer is required to accept the possibility of selecting motor parameters as close as possible. 5.3 Requirements for structure
5.3.1 The structural dimensions of the electric control equipment must comply with the provisions of GB3047-1. 5.3.2 The structure of the electric control equipment should be composed of materials that can withstand mechanical, electrical and thermal stresses. 5.3.3 The structure of the electric control equipment should ensure the safety, reliability and convenience of the equipment during operation, operation and maintenance. The metal shell of the equipment must have reliable contact and grounding. The specific requirements for grounding are shown in Article 5.9.12 of the standard. Under the heat, arc, impact vibration and other energy fields generated by the operation or action of each electrical component, the structure shall not be significantly deformed and burned, the electrical components shall not malfunction, the conductor shall be excessively deformed, the insulation shall be significantly damaged, and the fasteners shall not be loose. 5.3.4 The door (cover) of the control cabinet (box) should be able to be opened and closed flexibly within a range of not less than 90°, and should be equipped with a special door lock. Under special circumstances, the control box (table) is allowed to be exempted from this restriction. 5.3.5 Large (or heavy) cabinets, boxes, and tables should be equipped with safe and reliable lifting devices at appropriate locations or have the conditions for lifting. 5.3.6 The mounting plates and panels (when metal plates) of the control cabinets, boxes, and tables should be flat, and all welding points must be uniform and firm. There should be no burn-through or defects. When it is an insulating base plate, it should be insulated according to the prescribed process procedures. 4
JB5863-91
5.3.7 The control cabinet, box, and table must have mounting holes for installation and fastening. It is allowed not to have mounting holes only when it is really not necessary. 5.3.8 When the electronic control equipment is used in places with high temperature or large humidity changes, additional facilities (such as enhanced ventilation, heat dissipation or heating and drying, etc.) should be installed to prevent abnormal condensation inside the equipment based on the selected protection level (the minimum protection level should meet the requirements of IP20 protection level) according to the agreement with the user. 5.3.9 When the working environment of individual electrical components in the electronic control equipment is allowed to be lower than the normal working conditions specified by the electronic control equipment, appropriate adjustments and guarantees (such as sealing, heating, ventilation and cooling, etc.) should be made from the perspective of structural facilities. 5.3.10 All ferrous metal parts should have a reliable coating. 5.2.11 The paint color of the control cabinet, box, table and other parts of the electronic control equipment that need to be painted should be uniform, and the surface of the paint layer should be flat and beautiful, without defects such as bubbles, cracks, wrinkles and flow marks. The paint color of the cabinets, boxes and tables of the same set of electronic control equipment should be consistent. 5.4 Installation and wiring of components
5.4.1 The installation of components in electronic control equipment should comply with the provisions of the technical documents and installation regulations of the components. At the same time, it should also be installed and adjusted according to the technical requirements of the drawings. There should be eye-catching symbols (or codes) near the components. The quality of the labels should meet the technical requirements of the components themselves, and the labels should be glued to the corresponding positions behind the board.
5.4.2 The electrical components that need to be operated and observed in the electric control equipment should be installed at a height that is convenient for operation and observation. For example, the actuator of the emergency switch on the operating cabinet should be installed at a height of 0.8 to 1.6m, the operating switch button should be installed at a height of 0.6 to 1.8m, and the maximum height of the indicator device that needs to be observed shall not exceed 2m and shall not be less than 1m (the height refers to the ground relative to the operator's standing). 5.4.3 The arrangement of electrical components in the electric control equipment should ensure the arcing distance and have sufficient repair distance (such as the distance required for repairing contactors after wiring).
5.4.4 Small components weighing less than 1.5g in the electric control equipment can be directly fixed using their own lead wires if they are sure that they will not be damaged during normal use and transportation. Other components must be fixed by mechanical methods. 5.4.5 The control circuit of the electric control equipment should comply with the relevant provisions of GB3797, and emergency stop switches should be installed along the way. The colors of buttons and indicator lights selected in the electric control equipment should comply with the provisions of GB2682. 5.4.6
The phase sequence, polarity and color arrangement of the busbar installed in the main circuit of the electric control equipment should be in accordance with Table 3. Table 3
Zero line or neutral line
Light blue
Light blue
The above positions are relative to the observation from the front of the equipment; the grounding neutral line uses a yellow and green double-color line. Vertical arrangement
Bottom
Bottom
Horizontal arrangement
Rightmost
Rightmost
Front and back arrangement
Nearest
Nearest
When installing electrical components and wiring in electric control equipment, heat-resistant insulated wires and electrical components (or components affected by temperature changes) should be sufficiently far away from heating components (see Table 4) to ensure that they do not affect the normal operation and service life of electrical components and wires. Heat-resistant insulated wires connected to the heating element should have their insulation stripped off at their ends and be covered with heat-resistant porcelain beads (see Table 4 for their length). The installation direction of the heating element should be in a direction that is conducive to heat dissipation (such as tubular resistors should be installed horizontally) or in the direction specified in the technical requirements of the component itself.
5.4.9 The connection points of all wires of the electric control equipment are allowed to connect only two wires at most, and a silver-plated copper washer should be placed in the middle (when the wire contact is flat, the copper washer can be omitted). 5
The heating power of the heating element is not a percentage of its
rated power
JB5863-91
The minimum distance between the electrical component and the heating element to be maintained in mm
The value in the first row is the value when the air temperature rise in the cabinet is ++20K?
The value in the first row is the value when the air temperature rise in the cabinet is +10K. ②
The insulation length of the connecting wire on the heating element to be stripped
The connecting wire in the electric control equipment should be pressed with a copper crimping terminal at the end, and only one wire should be pressed in a joint. The hard core wire can be pressed without a joint, but reliable contact should be ensured. No transition connection such as welding or button joint is allowed in the middle of each wire. The electrical overload capacity and tensile strength of the cold-pressed joint can be referred to Appendix A when not specified in the technical documents of individual products. 5.4.11
Circuit numbering.
When connecting wires in electric control equipment, when different circuits are marked with the same color wire or it is easy to cause confusion, the wires must be marked at both ends of the wires. The connection between busbars, wires and electrical connectors of different materials should take measures to slow down electrochemical corrosion. The control equipment wiring (including busbars, cables, and wires) should be led into the wiring trough (ditch) as much as possible, and cannot be led into the wiring trough 5.4.13
Cables and conductors in the (grooves) shall be neatly bundled and beautifully decorated or placed on a bracket with equivalent strength, and shall not be allowed to be close to bare conductive parts with different potentials or objects with sharp edges. 5.4.14
Wires that may be subjected to vibration and torsion (such as wires on contactors above 100A, wires through doors, etc.) shall use copper core insulated soft wires. For twisted wire bundles, they shall also be wrapped with non-self-igniting hoses or take other measures to increase the torsion life of the wires. The bending radius of the wire bundle shall be greater than 10 times the diameter of the wire bundle. Sufficient margin shall be left for its torsion length. 5.4.15 The lead-out wires of the control cabinets, tables, and boxes of the electric control equipment shall be concentrated on the terminal block. Sufficient spare terminals shall be left. For lead-out wires with a current of more than 63A, it is allowed to be directly led out from the component connector. The capacity of the terminal block should be able to allow the rated current of the connected circuit to pass through, and the temperature rise of the terminal block should not exceed the provisions of its own standard. 5.4.16 The control circuit wiring is not allowed to be directly connected to the M8 and above wiring screws of the main circuit. Conductive sheets must be used for lead-out wiring. M6 and below screws can also be used to tighten the lead-out wiring on the main bus. 5.4.17 The lubricating oil used in the electric control equipment should be adapted to the requirements of the use environment of the electric control equipment. It is absolutely not allowed to produce sticking and freezing after adding lubricating oil, which will affect the normal operation of the electric control equipment. 5.5 Electrical clearance and creepage distance
The internal electrical clearance and creepage distance of the components and parts selected in the electric control equipment shall comply with the provisions of the technical documents of the components and parts themselves.
In indoor electric control equipment composed of low-voltage electrical appliances, the electrical clearance and creepage distance between each conductive part and between the conductive part and the ground and the outer shell frame shall comply with the provisions of Table 5. Table 5
Rated insulation voltage U,
U≤300
300U≤660
660U800
800
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