JB/T 5874-1991 General technical specifications for electrical equipment of battery transport vehicles
Some standard content:
Mechanical Industry Standard of the People's Republic of China
General Electrical Technical Conditions for Battery Industrial Vehicles 1 Subject Content and Scope of Application
This standard specifies the environmental conditions, technical requirements and test methods for battery industrial vehicles. This standard applies to battery industrial vehicles with a battery voltage of 96V or less that are not driven on roads. This standard does not apply to batteries, motors, control devices and other components of other industrial vehicles. JB/T5874-1991
Note: The electrical equipment in this standard refers to the combination of switch devices and their control, protection and speed regulating devices for controlling all electrical equipment (motors, lamps, etc.) of battery industrial vehicles, as well as the general term for the complete set of equipment including the interconnecting parts, accessories, casings and supporting parts between the above electrical appliances and equipment. 2 Reference standards
GB6988.16988.7 Electrical drawings
GB5094
GB4884
GB4728
GB2682
GB7159
GB4457~4460
GB7403
JB4785
JB3974||tt| |JB2391
JB1865
JB3811
JB/DQ5119
3 Environmental conditions
3.1 Working conditions
Project codes in electrical technology
Marking of insulated wires
Graphical symbols for electrical diagrams
Colors of indicator lights and buttons of electrical complete setsGeneral rules for the formulation of text symbols in electrical technologyMechanical drawing
Lead-acid batteries for traction
Number, position and light color of external lighting and signal devices of automobiles and trailersBatteryBatteryTechnical conditions for DC electrical appliances for vehicles0.510 ton counterbalanced forkliftTechnical conditions
Lead-acid batteries for battery vehicles
Battery ... Parameters and technical conditions Technical conditions for DC motors for battery vehicles All electrical equipment that meets this standard should be able to ensure the normal operation of industrial vehicles under the following environmental conditions. Altitude not exceeding 1200m;
b. The ambient air temperature shall not exceed +40℃ and shall not be lower than -25℃; when the ambient temperature is +40℃, the relative humidity shall not exceed 50%. At lower temperatures, a higher relative humidity is allowed (for example, c.
90% at 20℃);
d. Flat and solid road surface.
3.2 Special conditions
Environmental conditions with any of the following are called special conditions. At this time, the manufacturer shall consult with the user to formulate an acceptance agreement based on the relevant requirements under the corresponding conditions, and carry out the design of the electrical equipment. Manufacturing: 8. Altitude, ambient temperature and humidity do not meet the values specified in Article 3.1. Approved by the Ministry of Machinery and Electronics Industry on October 24, 1991 176
Implementation on October 1, 1992
JB/T58741991
Due to rapid temperature changes, abnormal condensation may occur inside the electrical equipment and affect the normal use of the electrical equipment. There are strong electric fields and fields;
Long-term environment with air pollution and mold or microbial erosion; e
There is a risk of fire or explosion;
Other abnormal use conditions (such as working in rain or snow). 4 Technical requirements
4.1 The electrical equipment of the vehicle shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. The product working drawings and technical documents shall include the following items: General electrical drawing:
Circuit diagram:
Wiring diagram (or wiring table);
d. Unit location diagram;
Operation and maintenance instructions;
f. Equipment component table.
The "Operation and Maintenance Instructions" provided to the user shall include the contents of item b, and the contents specified in items c and 1 shall also be provided when necessary. The operating sequence and precautions shall be clearly stated in the instructions. The electrical "Operation and Maintenance Instructions" can be compiled together with the instructions for the core part of the vehicle. 4.1.1 General electrical drawing
The general electrical drawing is a working drawing that outlines the distribution and installation of the various components of the vehicle's electrical equipment on the vehicle, as well as the relationship between them. 4.1.1.1 The general drawing is drawn by using double-dotted lines to draw the outline and structural diagram of the vehicle in proportion, and using thick solid lines, graphic symbols (see Appendix A) or outlines to indicate the positions of electrical components and devices such as motors, speed control devices, operating panels, junction boxes, and travel switches on the vehicle, and provide the parts and components required for the installation of these items. If necessary, the working drawing number should be given. The project code should be marked near these items. A table showing the use and meaning of project codes (high-level codes and position codes) can also be drawn on the electrical general drawing. The use of project codes should comply with the requirements of GB5094.
4.1.1.2 When the technical requirements of the product exceed the requirements of this standard, the technical requirements can be written on the electrical general drawing. 4.1.1.3 When the interconnection wiring diagram (table) is not drawn, the interconnection relationship between the various components of the electrical equipment should be indicated on the electrical general drawing. 4.1.2 Circuit diagram
The circuit diagram is a simplified diagram that uses graphic symbols to show in detail the basic components and connection relationships of circuits and electrical devices without considering their actual positions.
Graphic symbols should comply with the provisions of GB4728. The circuit diagram should use a format with a width of 297mm and a length that is an integer multiple of 210mm. 4.1.2.1 Drawing of circuits
The circuit is drawn vertically and arranged in sequence according to the principles of main circuit, control circuit, action sequence and function. Similar items should be aligned horizontally.
Longer lines that need to be cross-connected in the circuit should be represented by interrupted lines. The circuit of the external supply device (but the device should have a manual provided to the user) allows part of the device to be drawn (with dotted lines to make a frame), but the mutual connection relationship between the external circuit and the device must be clear. 4.1.2.2Items in the circuit diagram are represented by codes plus numbers without prefixes. The codes for electrical types are written in accordance with the provisions of GB7159. For example: KM1, KM2, KA1....*.
4.1.2.3 For the main switch of the resistance speed control, a table should be used to indicate the sequence of actions and the contact action. The contact symbols of relays, contactors, switches, etc. should be drawn in the form of left open and right closed or top closed and bottom open. Each component and device should be in a non-excitation or non-working state in the circuit. However, the travel switch that is subjected to external force at the beginning of work must be drawn in the state under the action of external force, as shown in Figure 1, indicating that after the travel switch cam is pressed, it becomes a "left closed and right open" state (that is, the switch's break contact is open at this time, and the make contact is closed at this time). Figure
4.1.3 Wiring diagram and wiring table
The wiring diagram and wiring table are a kind of simple diagram and table used for installation wiring and line inspection, maintenance and accident handling. This type of drawing is often used together with the circuit diagram and position diagram.
4.1.3.1 Each item in the wiring diagram can be represented by a simplified graphic (such as a square, rectangle, circle, etc.), and the project code consistent with the circuit diagram should be marked next to the graphic.
4.1.3.2 The content and format of the interconnection line table are shown in Table 1. Table 1
Project code
Project code
4.1.3.3 If the terminals of the terminal board (socket), connector, etc. are not marked, they can be marked: according to the numbering mark consistent with the circuit diagram,
It can also be set with Arabic numerals according to the following principles: from top to bottom, from left to right, and arranged in sequence starting from 1. 4.1.3.4 The wires are distinguished by the combined marks of the subordinate end, and the marking method is shown in Figure 2; C
A1, D3: The marking of the local end (A and D represent the project code, 1 and 3 represent the terminal number of the project. If the terminal number is the same as the circuit diagram, the terminal number can be cancelled.)
16: The identification mark of the wire (consistent with the circuit number in the circuit diagram) should be clear and durable, and marked on both ends of the wire. If other marking methods are used, they should be explained in the drawings and documents of the wiring diagram (table), and examples should be given, but they must comply with the provisions of GB4884.
4.1.4 Unit location diagram
The unit location diagram is the installation location diagram of components in the control device, operation panel and other items in the electrical system. 178
JB/T5874-1991
4.1.4.1 The type items can be drawn according to the outer shape or simplified graphics (square, rectangle, circle, etc.) and arranged according to the actual position. 4.1.4.2 The location diagram should indicate the parts and components required to install these items, and clearly indicate the installation relationship between these components and the items. When the type items are drawn with 4.1.4.1, if the relationship with these parts cannot be clearly expressed, the type items should be drawn according to the actual objects. The drawing of these parts and the parts referred to in 4.1.1.1, as well as the cabinets (boards, etc.) used to install these items should comply with the relevant provisions of GB4457~4460 standards.
4.1.5 The equipment component table is a table that shows all the components and devices in the electrical equipment in a tabular form. Its content should include several items such as project code, name, model (including basic parameters), quantity and remarks. The name and project content of the component table provided to the user can be compiled according to the actual situation. 4.1.6 All matters not clearly specified in this standard shall be implemented in accordance with GB6988. 4.2 General requirements
4.2.1 Batteries, contactors, and motors should give priority to products that meet the standards of GB7403, JB3974, and JB/DQ5119. If other electrical appliances are used on battery industrial vehicles, they should be verified according to the parameters required in actual use and the requirements of JB3974, and can withstand the type test of battery industrial vehicles. Note: ① The chopper speed regulating device should also use products with standards; ② When the battery products that meet GB7403 are not used, products that meet the JB1865 standard must be used. 4.2.2 Each component and device in the installation board should have a project code consistent with the circuit diagram. The project code should be marked near the component and device in a durable way.
4.2.3 The installation and light color of the lamp should refer to the requirements of JB4785. When the shell of the lamp used is connected to one end of the bulb, insulation measures must be taken to insulate the lamp from the vehicle body. 4.2.4 When the indicator light is used for danger and alarm indication, it should be red, and when it is only used for power on indication, it should be white. If the indicator light used is used for other functional indications, it should comply with the provisions of GB2682. 4.2.5 The selection of the motor should be able to ensure the requirements of the vehicle's specified climbing and overload tests. In this case, it should be ensured that the maximum current of the motor is not exceeded.
4.2.6 In order to ensure the smooth acceleration of the vehicle, for the resistance speed regulation method, under rated load, it should be ensured that the vehicle can start normally when it is in the first speed regulation gear on a flat road, and the speed difference of each gear shall not be greater than 4km/h. 4.2.7 WiringWww.bzxZ.net
4.2.7.1 The connection of all wires must be firm and reliable and must not be loose; crimping is recommended for wiring. The connecting wire must be continuous, and no joints are allowed between the two terminals. 4.2.7.2 Copper core polyvinyl fluoride insulated soft wire is recommended for the wire. If other wires are used, they must be resistant to acid and oil corrosion. Wires going to the same project shall be tied separately according to the control circuit and the main circuit, and shall be kept away from the moving parts and heat-generating parts of the vehicle. Long interconnecting wires shall be fixed with wire clamps or other methods. Measures shall be taken to prevent damage to the engine core when necessary. The cross-sectional area of the interconnecting wires shall not be less than 0.75mm. The wires shall not be used. The moving wire harnesses must be supported, and the wire contacts shall not be subjected to tension. The drooping and curved parts shall be of sufficient length so as not to affect the operation of the moving parts of the vehicle. 4.2.7.3 If there are two or more identical connectors in the same unit position, they must be clearly marked to ensure that no wrong connection occurs. 4.2.8 The cabinet for installing the speed control device shall have sufficient mechanical strength and rigidity. It is recommended to paint the inside of the cabinet with orange paint. 4.2.9 The screws (bolts) shall have a reliable anti-corrosion coating, and anti-loosening devices shall be installed around the fastening parts. 4.2.10 The electrical clearance and creepage distance between each live circuit and between live conductor parts and other conductor parts shall not be less than: Creepage distance: 8mm, electrical clearance: 5mm. The above values are not applicable to printed circuit boards of control devices. 4.2.11 Electrical insulation
4.2.11.1 The insulation resistance of batteries without electrolyte shall not be less than 50kN. 4.2.11.2 When the battery power line is disconnected, the insulation resistance of the remaining live circuits and the vehicle body shall not be less than 0.5MO in the cold state. 179
JB/T5874—1991
4.2.12 After the battery power line is disconnected, the circuits insulated from each other and between the circuits and the vehicle body shall be able to withstand the corresponding 50Hz sine wave voltage for 1min without breakdown damage. The test voltage values are: battery voltage <48V
test voltage 425V
battery voltage ≥48V～96V
test voltage 850V
4.2.13 Battery industrial vehicles should be able to withstand reliability and durability tests, and be able to withstand transportation bumps and impacts. 4.3 Safety protection
4.3.1 It must have a voltage indication device. If an electronic type is used, it should indicate by light or sound. 4.3.2 It must be equipped with an audio signal device such as a horn, and the installation position of the signal device control device should be convenient for operation. 4.3.3 The battery pack must be equipped with a power connector, a part of which must be fixed on the vehicle body or battery box. When charging, the connector should be able to disconnect the working circuit in the electrical system. 4.3.4 The contactor contacts of the main electrical circuit should take arc extinguishing measures, or be installed in a position where the arc flame or molten metal cannot splash onto the combustible material.
4.3.5 If the industrial vehicle uses a resistor to adjust the speed, the speed regulating resistor should be installed in a position where the air can circulate and avoid damage. The heat generated should not cause the surrounding combustibles to burn, and damage the adjacent vehicle parts. 4.3.6 For the cabinet equipped with the control device, there must be sufficient protection against electrical short circuits caused by the intrusion of solid objects, dust and liquids. The minimum protection level is IP21, and the cabinet door (cover, plate, etc.) can only be opened with special tools. 4.3.7 When the vehicle is braking, it should be able to disconnect the electrical control circuit and cut off the power to the motor circuit. If the power failure of the motor circuit will cause the safety of the electrical equipment, other corresponding measures are allowed to be adopted to stop the vehicle reliably. 4.3.8 A device that can cut off the control operation circuit when the driver leaves must be installed. 4.3.9 For high-lift vehicles where the operator rises and falls with the lifting platform, if a control device is installed on the lifting platform, when any process controlled by the device is selected, it must be ensured that the control device at other positions does not work. If there are more than two positions on the high-lift vehicle with control devices installed, only one position of the control device is allowed to work at the same time.
A device that can cut off the vehicle power supply must also be installed on the lifting platform. 4.3.10 After the speed control pedal (joystick) is stepped on (pushed) and the motor is running, the motor circuit should not be able to reverse. Reversal is only allowed when the speed control pedal (joystick) returns to the initial state. 4.3.11 The vehicle body shall not be in electrical contact with live components, nor can it be used as a component of the circuit. 4.3.12 The motor circuit, control circuit, and lighting circuit must have short-circuit devices for safety protection. It is recommended that each motor circuit be equipped with an independent short-circuit protection device. If only one main protection device is used for short-circuit protection of several motor circuits, when any motor circuit causes a short circuit, the protection device must be able to operate reliably; the protection devices of other circuits with the same voltage supply should be connected to the load side of the main protection device, and each protection device should be able to ensure that it does not cross-level operation.
The fuse of the short-circuit protection device shall not be exposed. 4.3.13 To avoid accidents in the electrical part, an emergency stop device must be installed in the electrical system. The emergency stop device should be able to quickly and reliably cut off the power supply, or cut off the faulty circuit. If a mushroom head button is used, the button should be red, and the bottom panel should be lined with a yellow pattern. If a pedal, push rod, etc. are used as the operating part of the emergency stop device, the operating part should be painted red. The emergency stop device should be installed in a place where it is easy to operate. 4.3.14 For battery industrial vehicles with a voltage of 72V or above (including 72V), appropriate electric shock protection must be taken. 5 Inspection and Test
5.1 Before the vehicle leaves the factory for testing, the following items must be inspected on the electrical equipment: Visual inspection (Articles 4.2.1~4.2.4; 4.2.7; 4.2.8~4.2.10; 4.3.1~4.3.6; 4.3.11~4;3.14) a.
Insulation resistance test (Article 4.2.11); 180
c. Dielectric test (Article 4.2.12).
5.1.1 Visual inspection
JB/T5874-1991
Based on the manufacturing design drawings and the relevant articles of this standard, visually inspect the installation, marking, wiring, safety protection measures, etc. of the components and devices.
5.1.2 Insulation test
5.1.2.1 The insulation resistance of the following conductors should be checked; a.
Insulation resistance of conductors in power circuit to vehicle body; insulation resistance of conductors in motor circuit to vehicle body; b.
Insulation resistance of all conductors in control circuit to vehicle body; c.
Insulation resistance of conductors in lighting circuit and other auxiliary circuits to vehicle body. d.
When measuring, the power supply should be disconnected, and the test should be carried out with a megohmmeter with a voltage level of 500V in a cold state. For components and devices that cannot withstand a voltage of 500V, they should be short-circuited or removed during the test. For items c and d, sampling tests are allowed when leaving the factory, but the conductor test points at each installation position should not be less than 30%. 5.1.2.2 After the uncharged batteries are assembled and connected, use a megohmmeter with a voltage level of 500V to measure the insulation resistance value of the positive and negative electrodes of the battery pack to the vehicle body or the battery pack box. 5.1.3 Insulation dielectric test
The dielectric test should be carried out under the following conditions: a. The anode, cathode and control pole of the thyristor in the main circuit are short-circuited together, and the contacts of the contactor, switch, etc. should be in a closed state or short-circuited. Components and devices that cannot withstand the test voltage should also be short-circuited or disconnected from the circuit. b. The test voltage should start from half of the rated voltage value, and rise continuously or in steps of no more than 5% of the full value. The time to reach the full value should be no less than 10s, and then maintained for 1min. After the test, the voltage should be gradually reduced to zero. Insulation dielectric test is allowed only during vehicle type test. 5.2 Before the vehicle leaves the factory, the electrical equipment must also be tested for operation. The operation test is a no-load test and a load test. 5.2.1 No-load test
Before the test, check all the wiring of the electrical equipment. When all the wiring is correct, empty the driving wheel of the vehicle, and under the conditions of exposing the rated voltage of the battery and 85% of the rated voltage, repeat the operation 5 times according to the operating sequence of the electrical manual. There is no malfunction, and perform operation inspections on Articles 4.3.7~4.3.10 and 4.3.13. At this time, it should be avoided that the travel motor is in an overspeed state. 5.2.2 Load test
Load test refers to whether the technical performance of electrical equipment meets the requirements of the vehicle itself and Articles 4.2.5 and 4.2.6 of this standard under the load conditions specified by the battery industrial vehicle product. It is generally carried out at the same time as the inspection test of the mechanical part of the vehicle, and some vehicles can also be sampled. 5.2.2.1 Climbing performance inspection
Before entering the ramp, the vehicle should be in a normal acceleration or running state, and then enter the ramp specified by the product, and gradually accelerate on the ramp until the travel motor works at the highest speed gear. During the test, the motor working current and battery working voltage should be measured. 5.2.2.2 Acceleration stability inspection
For vehicles with resistance speed regulation, on a flat road, run stably at each gear for 20 to 30 meters and record the speed. During the test, the motor working current and battery working voltage should be measured. 5.3 Type test
Type test of electrical equipment of battery industrial vehicles is generally carried out at the same time as the vehicle is undergoing type test. At this time, it is necessary to assess whether the various technical performances of the electrical equipment under actual use meet all the technical requirements of the vehicle and the requirements specified in 4.2.13 of this standard. When conducting type tests, all inspection tests in 5.1 and 5.2 should be completed. 181
JB/T5874—1991
When major improvements are made to electrical equipment (for example, when changing from resistor speed regulation to wave speed regulation), type tests must be conducted on the electrical equipment, but 4.2.13 assessment may not be required at this time.
Note: Before there is a special test method for battery industrial vehicles, the requirements of JB2391 and JB3811 shall be temporarily followed. 182
A1 Explanation
JB/T5874—1991
Appendix A
Graphic symbols for electrical general drawings
(Supplement)
8. The graphic symbols included in this standard can be used to represent electrical devices (electrical components) and circuit components. However, when these devices and components are drawn according to the actual projection, they are not within the scope of this standard. b. Graphic symbols can be enlarged or reduced as required while ensuring that their shapes remain unchanged. When the graphics in this standard are not sufficient, they should be compiled according to the requirements of GB4728, and explanations should be given in relevant drawings and documents, and reported to the relevant authorities for filing.
A2 Electrical devices
See Table A1 for electrical devices
DC motor
Rectifier
Battery pack
General symbols for control cabinets, control boxes, control consoles, and control cutting screens Terminal box (box) Junction box
Operation panel, operation board
Travel switch, limit switch
Master switch
Note: n is the number of digits
Using international
standards
A3 Wires and their connections
See Table A2 for wires and their connections.
JB/T58741991
Buzzer
Electric horn
Light or signal light
Note: If the color needs to be indicated, the following symbols can be noted next to it C2 or RD—red
C4 or YE—yellow
C5 or GN—green
C6 or BU—blue
C9 or WH—white
Resistor box, resistor
Direction switch
Push button switch
General symbols for wires, wiring harnesses and cables
Flexible cable, movable wire
General symbols for busbars and trunk lines
Pipeline lines
Note: The cross-sectional dimensions or other characteristics of the pipeline can be marked above the pipeline line.
Situation of adopting international
Standards
Situation of adopting international
Standards
Additional notes:
JB/T5874-1991
Continued Table A2
Metal hose lines, plastic pipe lines
Note: The cross-sectional dimensions and types of the pipes can be marked above the lines. Wires, wire bundles, and cables fixed with wire clips Metal hose (plastic pipe) lines surrounded by wire clips Pipe lines fixed with wire clips
Single-pole socket
Single-pole plug
Single-pole plug socket
Multi-pole plug socket
Multi-line representation form
Single-line representation form (numbers represent the number of poles) This standard was proposed and managed by the Shenyang Electrical Special Equipment Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Shenyang Electrical Special Equipment Research Institute. The main drafters of this standard were Qian Tiewen and Hong Ming. Adoption of international
standards3 Type test
Type test of the electrical equipment of battery industrial vehicles is generally carried out at the same time as the vehicle is undergoing type test. At this time, it is necessary to assess whether the various technical performances of the electrical equipment under actual use meet all the technical requirements of the vehicle and the requirements specified in 4.2.13 of this standard. When conducting type test, all inspection tests of 5.1 and 5.2 should be completed. 181
JB/T5874—1991
When the electrical equipment is significantly improved (for example, when changing from resistance speed regulation to wave speed regulation), the electrical equipment must be type tested, but 4.2.13 can be omitted at this time.
Note: Before there is a special test method for battery industrial vehicles, it shall be conducted in accordance with the requirements of JB2391 and JB3811. 182
A1 Explanation
JB/T5874—1991
Appendix A
Graphic symbols for electrical general drawings
(Supplement)
8. The graphic symbols included in this standard can be used to represent electrical devices (electrical components) and circuit components. However, when these devices and components are drawn according to actual projection, they are not within the scope of this standard. b.
Graphic symbols can be enlarged or reduced as needed while ensuring that their shapes remain unchanged. When the graphics in this standard are not sufficient, they should be compiled in accordance with the requirements of GB4728, and explanations should be given in relevant drawings and documents, and reported to the relevant unit for filing.
A2 Electrical equipment
See Table A1 for electrical equipment
DC motor
Rectifier
Battery pack
General symbols of control cabinet, control box, control console, control cutting screenTerminal box (box) Junction box
Operation panel, operation board
Travel switch, limit switch
Master switch
Note: n is the number of digits
In the case of adopting international
standards
A3 Wires and their connections
See Table A2 for wires and their connections.
JB/T58741991
Buzzer
Electric horn
Light or signal light
Note: If the color needs to be indicated, the following symbols can be noted next to it C2 or RD—red
C4 or YE—yellow
C5 or GN—green
C6 or BU—blue
C9 or WH—white
Resistor box, resistor
Direction switch
Push button switch
General symbols for wires, wiring harnesses and cables
Flexible cable, movable wire
General symbols for busbars and trunk lines
Pipeline lines
Note: The cross-sectional dimensions or other characteristics of the pipeline can be marked above the pipeline line.
Situation of adopting international
Standards
Situation of adopting international
Standards
Additional notes:
JB/T5874-1991
Continued Table A2
Metal hose lines, plastic pipe lines
Note: The cross-sectional dimensions and types of the pipes can be marked above the lines. Wires, wire bundles, and cables fixed with wire clips Metal hose (plastic pipe) lines surrounded by wire clips Pipe lines fixed with wire clips
Single-pole socket
Single-pole plug
Single-pole plug socket
Multi-pole plug socket
Multi-line representation form
Single-line representation form (numbers represent the number of poles) This standard was proposed and managed by the Shenyang Electrical Special Equipment Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Shenyang Electrical Special Equipment Research Institute. The main drafters of this standard were Qian Tiewen and Hong Ming. Adoption of international
standards3 Type test
Type test of the electrical equipment of battery industrial vehicles is generally carried out at the same time as the vehicle is undergoing type test. At this time, it is necessary to assess whether the various technical performances of the electrical equipment under actual use meet all the technical requirements of the vehicle and the requirements specified in 4.2.13 of this standard. When conducting type test, all inspection tests of 5.1 and 5.2 should be completed. 181
JB/T5874—1991
When the electrical equipment is significantly improved (for example, when changing from resistance speed regulation to wave speed regulation), the electrical equipment must be type tested, but 4.2.13 can be omitted at this time.
Note: Before there is a special test method for battery industrial vehicles, it shall be conducted in accordance with the requirements of JB2391 and JB3811. 182
A1 Explanation
JB/T5874—1991
Appendix A
Graphic symbols for electrical general drawings
(Supplement)
8. The graphic symbols included in this standard can be used to represent electrical devices (electrical components) and circuit components. However, when these devices and components are drawn according to actual projection, they are not within the scope of this standard. b.
Graphic symbols can be enlarged or reduced as needed while ensuring that their shapes remain unchanged. When the graphics in this standard are not sufficient, they should be compiled in accordance with the requirements of GB4728, and explanations should be given in relevant drawings and documents, and reported to the relevant unit for filing.
A2 Electrical equipment
See Table A1 for electrical equipment
DC motor
Rectifier
Battery pack
General symbols of control cabinet, control box, control console, control cutting screenTerminal box (box) Junction box
Operation panel, operation board
Travel switch, limit switch
Master switch
Note: n is the number of digits
In the case of adopting international
standards
A3 Wires and their connections
See Table A2 for wires and their connections.
JB/T58741991
Buzzer
Electric horn
Light or signal light
Note: If the color needs to be indicated, the following symbols can be noted next to it C2 or RD—red
C4 or YE—yellow
C5 or GN—green
C6 or BU—blue
C9 or WH—white
Resistor box, resistor
Direction switch
Push button switch
General symbols for wires, wiring harnesses and cables
Flexible cable, movable wire
General symbols for busbars and trunk lines
Pipeline lines
Note: The cross-sectional dimensions or other characteristics of the pipeline can be marked above the pipeline line.
Situation of adopting international
Standards
Situation of adopting international
Standards
Additional notes:
JB/T5874-1991
Continued Table A2
Metal hose lines, plastic pipe lines
Note: The cross-sectional dimensions and types of the pipes can be marked above the lines. Wires, wire bundles, and cables fixed with wire clips Metal hose (plastic pipe) lines surrounded by wire clips Pipe lines fixed with wire clips
Single-pole socket
Single-pole plug
Single-pole plug socket
Multi-pole plug socket
Multi-line representation form
Single-line representation form (numbers indicate the number of poles) This standard was proposed and managed by the Shenyang Electrical Equipment Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Shenyang Electrical Equipment Research Institute. The main drafters of this standard were Qian Tiewen and Hong Ming. Adoption of international
standards
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