Some standard content:
Mechanical Industry Standard of the People's Republic of China
Wireless Remote Control Devices for Hoisting Machinery
1 Subject Content and Scope of Application
JB/T 8437--96
This standard specifies the terminology, product classification and model, technical requirements, test methods and inspection rules, marking, packaging, transportation and storage, and warranty period of wireless remote control devices for hoisting machinery. This standard is mainly applicable to the design, manufacture, quality certification and inspection of import and export of wireless remote control devices for hoisting machinery. Wireless remote control devices for other mechanical equipment can also be used as a reference. 2 Reference standards
GB191 Packaging storage and transportation graphic mark
GB2423.5 Basic environmental test procedures for electronic products Test Ea: Impact test method GB2423.8 Basic environmental test procedures for electronic products Test Ed: Free fall test method GB/T3873 General technical conditions for communication equipment product packaging GB/T4942.2 Protection grade of low-voltage electrical enclosure GB7627 Characteristics of distortion and error rate measuring instrument for data transmission GB12192 Mobile communication FM radio telephone transmitter measurement method GB12193 Mobile communication FM radio telephone receiver measurement method GB13543 Environmental test methods for digital communication equipment GB/T13926.4 Electromagnetic compatibility of industrial process measurement and control equipment Electrical fast transient pulse group requirements JB4315 Crane electronic control equipment
IEC1000-4-5:1995 Electromagnetic compatibility test and measurement technology Part 5: Surge resistance requirements 3 Terminology
3.1 Telecontrol
Use telecommunications to connect the measuring and control device with the decision unit to achieve control of the remotely operated equipment. 3.2 Remote control
Use radio, infrared light and other channels to control mechanical equipment across a certain distance. 3.3 Channel
Paths divided according to the characteristics of information transmission, including possible but not yet realized paths. 3.4 Spurious emission
Emission of one or some frequencies outside the necessary bandwidth, the emission level of which can be reduced without affecting the transmission of the corresponding information. Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and frequency conversion products, but exclude out-of-band emissions. 3.5 Frequency tolerance frequency tolerance The maximum permissible deviation of the center frequency of the frequency band occupied by the emission from the assigned frequency (or the characteristic frequency of the emission from the reference frequency). The frequency tolerance is expressed in parts per million or in hertz. 3.6 Necessary bandwidth
necessary bandwidth
Approved by the Ministry of Machinery Industry of the People's Republic of China on September 1996~0368
Implemented on July 1, 1997
JB/T 8437--96
Refers to such bandwidth, which is just enough to ensure the transmission of information with the required quality at the corresponding rate and under given conditions for a given emission category.
3.7 Occupied bandwidth occupiedbandwidth refers to the bandwidth of a certain frequency, in which the average power emitted below the lower frequency limit and above the upper frequency limit of this frequency band is respectively equal to the specified percentage β/2 of the total average power of a given emission. Unless otherwise specified, the value of β/2 should be 0.5%. 3.8 Active emergency stop active emergenecy The driver sends an emergency stop command through the transmitter to cut off the main power supply to the crane and stop the movement of the crane's mechanisms. 3.9 Passive emergency stop When the receiver cannot detect normal signals within a certain period of time or the receiver (control system) fails, it can cut off the channel power supply and stop the movement of the crane's various mechanisms.
4 Product classification and model
4.1 The classification and code of the wireless remote control device for crane machinery are divided according to different channels, see Table 1 for details. Table 1
4.2 Model Representation Method
Radio Channel
With Analog
Omit without Analog
Infrared Channel
Control Channel Number Use Two-digit Numbers
Inductive Transmission Channel
One-Manipulation Command (or Button) Maximum Number of Gears Use 1, 2.3.4…··To indicate the number of moving mechanisms of the crane Use 1, 2, 3.To indicate the design number Use 1, 2.3·To indicate
Classification Code
Note: ①) The product model (design number) needs to be applied to the professional technical centralized office and can be used after approval: the model representation method does not include imported products. ③The number of control channels is the number of control codes transmitted by the remote control channel, that is, the number of effective functional instructions that play a control role. 4.3 Marking example
A remote control device for radio channel transmission has a design serial number of 1. The controlled crane has three moving mechanisms: hoisting, trolley and carriage. The maximum number of gears for the main control command is 3, and the number of control channels is 20. It should be marked as: QW 1-3320 JB/T 8437--96
b. The remote control device with wireless channel transmission has a design number of 3. The controlled crane has four moving mechanisms, namely, main hoisting, auxiliary hoisting, trolley and small car. All are analog controlled. The maximum number of gears for the main control command is 1, and the number of control channels is 13. It should be marked as: QW 3-4113M JB/T 8437--96
The remote control device with infrared light channel transmission has a design number of 2. The controlled crane has three moving mechanisms, namely, hoisting, trolley and small car. The maximum number of button gears is 1, and the number of control channels is 8. It should be marked as: QH 2-3108JB/T 8437--96
5 Technical requirements
5.1 Environmental conditions for use
JB/T 8437—96
a. Ambient temperature (general use): -10~～+45C; special use (extremely hot and extremely cold): -30～～+65C; b. Relative humidity not more than 95%;
c. Atmospheric pressure 86～106kPa;
d. Appropriate measures should be taken when using in places with acid and alkali corrosive gases, dust or strong electromagnetic field interference. 5.2 Appearance structure and function
The outer surface of the product should be free of defects such as rust, peeling of the coating, scratches, burrs, cracks and deformation. All parts, fasteners and control parts should be installed correctly, firmly and reliably, and be flexible to operate, and the action can meet the design requirements. 5.3 Channel
5.3.1 Radio remote control channel
5.3.1.1 The frequency of the radio channel should comply with the provisions of "Special radio remote control frequency for large lifting machinery" approved by the State Radio Management Committee, see Table 2 for details.
Main station transmission frequency
Subordinate station transmission frequency
5.3.1.2 Wireless transmission power shall not exceed 20mW. 5.3.1.3 Carrier channel spacing is 25kHz. 5.3.1.4 Necessary transmission bandwidth shall not exceed 16kHz. 5.3.1.5 Frequency tolerance is 10X10-\.
5.3.1.6 Frequency stability is less than ±8×10-6 (at -10~+45°C, when power supply voltage is 85% or 110% of rated value). 5.3.1.7
The frequency, power, corresponding field strength and distance of weak power radio channels shall comply with the relevant regulations of the State Radio Management Committee. 5.3.2 Infrared light remote control channel
5.3.2.1 Infrared light transmitters and receiving sensors shall use semiconductor infrared light devices with a wavelength of 840~1100nm. 5.3.2.2 The effective distance shall not be less than 30m.
5.3.2.3 The optical signal in the channel shall be modulated to improve the anti-interference performance. 5.3.2.4
The pointing angle of the receiving sensor shall not be less than ±60° cone angle. 5.3.2.5
The receiver can be equipped with more than one receiving sensor loop, and multiple sensors can be used in each loop. 5.3.2.6
The receiving sensor is connected to the receiver body with a cable, and the cable should have good shielding function. The receiving sensor should be able to work normally under the following illumination. When it exceeds the illumination, it can refuse to act and alarm or passively stop. But there is no erroneous action. 5.3.2.7
Daylight: 80001x;
Lighting: 20001x;
The distance from the welding arc is greater than 6m.
5.4 Transmitter
5.4.1 Transmitter
5.4.1.1 The spurious emission power level of the radio transmitter should be less than -50dB (outside the center frequency ± 8.5kHz). 5.4.2 Functional encoder
5.4.2.1 According to different situations, the following two products can be produced respectively: with CPU circuit and address code:
hard-wired circuit, with address code.
JB/T 843796
5.4.2.2 The frame information is sent continuously in a fixed-length cycle. 5.4.2.3 The sending cycle of lazy information shall not exceed 0.15s. 5.4.2.4 The frame information shall contain the necessary check code, and the minimum check word shall be one byte. When using Hamming code for error correction, the Hamming distance shall be greater than or equal to 3.
5.4.2.5 The power indicator light shall flash or light up when the transmitter transmits a signal. 5.4.3 Control elements
5.4.3.1 The control button shall be provided with a protective ring.
5.4.3.2 The mechanical life of the button shall not be less than 1×10° times, and the micro button shall not be less than 2.5×105 times. 5.4.3.3 When a multi-speed master controller or a two-speed button is used to control the speed of the motion mechanism, an interlocking button shall be set on the joystick of the master controller. When the interlocking button is released, the mechanism shall be ensured to stop running. 5.4.3.4 The mechanical life of the master controller shall not be less than 5×105 times. 5.4.3.5 The emergency stop button of the strap-type transmitter shall adopt a self-locking rotary reset mushroom-shaped button. The mechanical life of the mushroom-shaped button shall not be less than 5×105 times, the micro mushroom-shaped button shall not be less than 5×104 times, and the manual reset switch shall not be less than 1×105 times. 5.4.4 If the power supply needs to be equipped with a key switch, its mechanical life shall not be less than 2.5×10° times, and the mechanical life of the micro key switch shall not be less than 2×10° times.
5.4.5 The continuous effective use time of the power supply after replacing the battery or charging shall not be less than 8h. 5.4.6 The power supply voltage shall be equipped with a light indication, and there shall be an undervoltage indication or alarm to prompt the replacement of the battery. 5.4.7 The transmitter shall be portable and convenient for the operator to move freely. Its weight: less than 1.5kg for hand-held type; less than 3.0kg for strap-type
5.4.8 When the transmitter is impact-resistant, the peak acceleration shall not exceed 300m/s according to the half-sine wave pulse. 5.4.9 The protection level of the transmitter shall not be lower than the following indicators: a. When used indoors: IP4X;
b. When used outdoors: IP54 (with key); c. When used in dusty places: IP65. 5.4.10 The transmitter shall fall twice in any direction without packaging. The drop height of the hand-held transmitter is 1000mm and the drop height of the shoulder-strap transmitter is 500mm. It can still work normally after falling.
5.5 Receiver
5.5.1 Receiver
5.5.1.1 The sensitivity of the radio receiver is less than 2μV (at 12dBSINAD). 5.5.1.2 The selectivity of the adjacent channel of the radio receiver is greater than 50dB (at ±25kHz). 5.5.1.3 The selectivity within the necessary bandwidth of the radio receiver is greater than -6dB at ±8kHz. 5.5.2 Receiver processor
5.5.2.1 All parts shall have software interlocking. 5.5.2.2 The forward and reverse running codes of the motion mechanism should be software interlocked. 5.5.2.3 The address code must be confirmed for each frame of information before the frame code is confirmed. However, emergency stop cannot be caused by the loss of an address code.
5.5.2.4 The driver issues an active emergency stop command through the transmitter until the receiver intermediate relay control terminal outputs an active emergency stop command. The time required should be less than 0.55. This command should cut off the main power supply. It is the highest priority. 5.5.2.5 When the high-frequency carrier cannot be detected or the data signal cannot be received, the passive emergency stop function should be implemented, and the main power supply of the channel must be cut off within 1.5s. When the sudden noise interference of the channel exceeds 1s or the correct address code cannot be detected within 1s, the channel power supply should be cut off. 5.5.2.6 The transmission bit error rate of the function code should be less than 0.1% (at 12dBSINAD). 5.5.2.7 The receiving processor must have an automatic reset function and can automatically resume operation when there is a deadlock in the CPU circuit. 5.5.3 The power supply of the receiver is supplied by the AC power grid, and its purification capacity should not be lower than the following indicators: 71
JB/T8437-96
a. Sensitivity to electrical fast transient pulse groups: 2kV; b. Surge absorption: 1.2/50ps, 2kV between lines; 4kV between lines and ground. 5.5.4 The receiver with CPU circuit should have monitoring and fault self-diagnosis functions, and the execution status of each function code should be displayed with lights, and the processing results of the processor for the fault should be displayed. 5.5.5 The protection level of the receiver. It should not be lower than IP44 for indoor use and IP54 for outdoor use. 5.5.6 The output interface of the receiver can use thyristors, power triodes or relay components, and its capacity should not be less than the capacity of the controlled component. The mechanical life of the relay should not be less than 1×10° times. 5.5.7 The maximum vibration condition of the installation part of the receiver is: 1.5mm displacement at 5-13Hz; 10 m/s2 vibration acceleration at 13-150Hz.
5.5.8 There should be no breakdown or flickering when AC 50Hz.1500V (effective value) is applied between the power plug and the shell of the receiver for 1min. 5.6 Intermediate relay box
5.6.1 The contact capacity of the intermediate relay should be selected according to the coil capacity of the contactor of the controlled crane. 5.6.2 It is allowed to install a small contactor instead of a relay in the intermediate relay box. 5.6.3 The mechanical life of the relay should not be less than 3×10° times. 5.6.4 The protection level of the intermediate relay box shall not be lower than IP44. 5.6.5 The vibration resistance of the intermediate relay box is shown in 5.5.8. 5.7 Safety requirements
5.7.1 Cranes using wireless remote control shall have various protection functions of the original crane, such as zero position, overcurrent, travel, and warehouse protection. 5.7.2 Cranes using wireless remote control shall be equipped with a main contactor or an air circuit breaker with pressure loss release to cut off the main power supply of the crane. 5.7.3 Cranes using wireless remote control shall have obvious remote control indicator lights on the crane. 5.7.4 When a crane can be operated by remote control or the driver's cab, the two shall be interlocked. 5.7.5 Relays and contactors for forward and reverse operation shall have electrical interlocks, and contactors may be equipped with mechanical interlocks when necessary. 5.7.6 The radio remote control system shall have the ability to resist co-frequency interference signals, and malfunctions are not allowed when subjected to co-frequency interference. 5.7.7 The housing of the receiver and the intermediate relay box shall be reliably connected to the steel structure of the crane. Electronic circuits should use a floating purified power supply. 6 Test methods and inspection rules
6.1 Channel and transmitter test methods
6.1.1 The test of transmission frequency shall be carried out in accordance with Chapter 6 of GI312192. 6.1.2 The test of transmission power shall be carried out in accordance with Chapter 8 of GB12192. 6.1.3 Test of transmission frequency band occupied bandwidth
Keep the center frequency of the spectrum analyzer consistent with the carrier frequency, and the average radiated power outside the low end and high end of the bandwidth (the average value in eight directions) only accounts for 0.5% of the average radiated power of the center frequency (-46dB), and the width between -46dB on both sides of the center frequency is the measured bandwidth. The measurement should be carried out during digital modulation, and the amplitude and symbol value of the input signal are the maximum rated values of the equipment under working conditions. 6.1.4 Frequency stability test
In a temperature environment of 20C±1C, the deviation of the power supply voltage is not large When the rated voltage is ±0.5%, the carrier frequency f is measured. When the ambient temperature is 45°C and -10°C respectively, the power supply voltage is adjusted to 110% and 85% of the rated value respectively, and the four frequency drifts △f are measured. The maximum value △fm is taken and the frequency stability is calculated as the frequency stability of the transmitter. Am
Sw=±f.
X10(X10-6)）
Where: Sw——frequency stability, ×10-(parts per million); Afm maximum frequency drift.Hz#
f,-carrier frequency, MHz.
6.1.5 The spurious emission test of the transmitter shall be carried out in accordance with the provisions of 9.4 of GB12192. 72
JB/T 8437-96
6.1.6 Use a storage oscilloscope or logic analyzer to record a single output waveform, and the measured recovery time should be less than 0.15s. Analyze the status of each bit of the waveform address code, function code and check code. The amplitude and time mark length should meet the design requirements. 6.1.7 Effective working time of power supply
The total current of the transmitter multiplied by 8h should be less than 0.9 times the rated ampere-hour of the power supply. 6.1.8 Impact resistance test
Perform according to the provisions of GB2423.5. The conditions for the impact resistance test of the transmitter are: peak acceleration 300m/s; half-sine wave pulse, and the test sample should be impacted three times in each direction of the three mutually perpendicular axes. 6.2 Receiver test
6.2.1 Sensitivity test shall be carried out in accordance with the provisions of Chapter 6 of GB12193. 6.2.2 Adjacent channel selectivity test shall be carried out in accordance with the provisions of Chapter 14 of GB12193. 6.2.3 Power purification ability test shall be carried out in accordance with the provisions of GB/T13926.4 and IEC1000-4-5, and 6.2.4 Vibration test shall be carried out in accordance with 5.2.1 of JB4315.4. The bit error rate test shall be carried out in accordance with the provisions of GB7627. 6. 2. 5
The protection level test shall be carried out in accordance with the provisions of GBT4942.2. 6.3 Environmental test
Test items and sequence
High temperature test;
Low temperature test;
Cyclic damp heat test;
Free fall test (non-packaging).
6.3.2 The high temperature test shall be carried out in accordance with the provisions of Chapter 6 of GB13543. 6.3.3
Low temperature test shall be carried out in accordance with the provisions of Chapter 5 of GB13543. 6.3.4
Cyclic damp heat test shall be carried out in accordance with Chapter 10 of GB13543. 6.3.5 The free fall test shall be carried out in accordance with the provisions of GB2423.8. 6.4 Inspection rules
6.4.1 Factory inspection (qualification, quality consistency inspection) 6.4.1.1 Each wireless remote control device shall be subject to factory inspection. The items for factory inspection are shown in Table 3. Table 3
Inspection items
Appearance structure and function
Transmitting frequency
Radio channel transmitting power
Occupied bandwidth
Frequency stability
Spurious emission
Reliable information transmission cycle
Transmitter
Effective working time of power supply
Impact resistance
Drop test
Technical requirements
5. 3.1. 4
5. 3. 1. 6
Test methods
Factory inspection
Type inspection
Receiver
Safety requirements
Protection requirements
Environmental test
Test items
Sensitivity
Adjacent channel selectivity
Active emergency stop
Passive emergency stop
Bit error rate
Power purification capability
Vibration test
Withstand voltage
Anti-co-channel interference capability
Protection level
High temperature test
Low temperature test
Alternating damp heat test
JB/T8437—96
Continued Table 3
Technical requirements
5. 5. 2. 6
Test method
Factory inspection
Type inspection
6.4.1.2 The quality inspection department of the manufacturer shall inspect according to the drawings and this standard. Only after passing the inspection, the product shall be accepted and a "Product Certificate of Qualification" shall be issued to the user.
Type test (certification inspection, quality certification, periodic inspection) 6.4.2.1
Type test shall generally be carried out in any of the following situations: trial production and identification of new products or old products transferred to the factory for production; after formal production, if there are major changes in structure, materials, and processes, which may affect product performance; regular tests shall be carried out during normal production;
When the product is discontinued for more than one year and production is resumed; when the national quality supervision agency conducts quality spot checks and quality certification. The items of type inspection are detailed in Table 3.
6. 4. 2. 2
6.4.2.3 Sampling method
At least two transmitters and two receivers shall be randomly selected from the sample, one of which shall be used for environmental testing. 6.4.2.4
Qualification judgmentwwW.bzxz.Net
The samples shall be inspected according to the items and sequence in Table 3; faults found during the type test are allowed to be repaired and the test shall be continued according to the following requirements: If a fault occurs during the environmental test, it is allowed to continue the test from the previous stage of the fault after repair. If readjustment is required when repairing the fault, the test shall be repeated; c.
For unqualified items, double sampling is allowed for retesting, and those who pass the test shall be judged as qualified for the type test; a test report provided by a testing agency recognized by the national competent authority shall be issued. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Product marking shall include at least the following items: product model and name;
Manufacturer name and trademark (if necessary);
Product number and manufacturing date.
Packaging marking shall include at least the following items: a.
Product model and name;
Manufacturer name and trademark (if necessary); packaging date;
JB/T 8437-96
Packaging storage and transportation graphic markings shall comply with the provisions of GB191. 7.2 Packaging
Qualified products accepted by the inspection department shall be packed together with product certificates, instruction manuals, packing lists and spare parts into the packaging box7.2.1
, and moisture-proof packaging materials shall also be placed in the box. 7.2.2 Product packaging shall comply with the provisions of GB/T3873. 7.3 Transportation
Packaged products should meet the transportation requirements of any means of transportation, and avoid direct rain and snow and strong vibration and impact during transportation. 7.4 Storage
Packaged products should be stored in a warehouse with ventilation at -10~+40C, relative humidity not more than 80%, no strong electromagnetic field influence around, and no other corrosive gases in the air. 8 Warranty period
The manufacturer should guarantee that the supplied products can work normally within 12 months from the date of use, but not more than 18 months from the date of shipment, under the conditions of proper storage, reasonable installation and correct use by the user. Additional notes:
This standard was proposed and coordinated by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Beijing Hoisting and Conveying Machinery Research Institute and Nanjing Hoisting Electric Appliance Factory No. 3. The main drafters of this standard are: Huang Guodong, Qiu Weizhang, Cui Zhenyuan, Wang Haiding, and Zhai Houzhong. 753 Sampling method
At least two transmitters and two receivers should be randomly selected from the sample, and one transmitter and one receiver should be used for environmental testing. 6.4.2.4
Qualification judgment
The samples shall be inspected according to the items and sequence in Table 3; the faults found during the type test are allowed to be repaired and the test shall be continued according to the following requirements: if a fault occurs during the environmental test, it is allowed to continue the test from the previous stage of the fault after repair. If readjustment is required when repairing the fault, the test shall be repeated; c.
The unqualified items are allowed to be doubled for re-sampling and re-testing, and the type test shall be qualified after passing the test; a test report provided by a testing agency recognized by the national competent authority shall be issued. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 The product marking shall include at least the following items: product model and name;
Manufacturer name and trademark (if necessary);
Product number and manufacturing date.
The packaging mark shall include at least the following items: a.
Product model and name;
Manufacturer name and trademark (if necessary); packaging date;
JB/T 8437-96
The packaging storage and transportation graphic mark shall comply with the provisions of GB191. 7.2 Packaging
The qualified products accepted by the inspection department shall be packed into the packaging box 7.2.1
together with the product certificate, instruction manual, packing list and spare parts, etc., and the box shall also be filled with moisture-proof packaging materials. 7.2.2The packaging of the product shall comply with the provisions of GB/T3873. 7.3 Transportation
The packaged products shall meet the transportation requirements of any means of transportation, and shall be protected from direct rain and snow and strong vibration and impact during transportation. 7.4 Storage
Packaged products should be stored in a ventilated warehouse with a temperature of -10 to +40°C and a relative humidity of no more than 80%, free from strong electromagnetic fields and other corrosive gases in the air. 8 Warranty period
The manufacturer should ensure that the supplied products can work normally within 12 months from the date of use, but no more than 18 months from the date of shipment, under the conditions of proper storage, reasonable installation and correct use by the user. Additional notes:
This standard was proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Beijing Hoisting and Conveying Machinery Research Institute and Nanjing Hoisting Electric Appliance Factory No. 3. The main drafters of this standard are: Huang Guodong, Qiu Weizhang, Cui Zhenyuan, Wang Haiding and Zhai Houzhong. 753 Sampling method
At least two transmitters and two receivers should be randomly selected from the sample, and one transmitter and one receiver should be used for environmental testing. 6.4.2.4
Qualification judgment
The samples shall be inspected according to the items and sequence in Table 3; the faults found during the type test are allowed to be repaired and the test shall be continued according to the following requirements: if a fault occurs during the environmental test, it is allowed to continue the test from the previous stage of the fault after repair. If readjustment is required when repairing the fault, the test shall be repeated; c.
The unqualified items are allowed to be doubled for re-sampling and re-testing, and the type test shall be qualified after passing the test; a test report provided by a testing agency recognized by the national competent authority shall be issued. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 The product marking shall include at least the following items: product model and name;
Manufacturer name and trademark (if necessary);
Product number and manufacturing date.
The packaging mark shall include at least the following items: a.
Product model and name;
Manufacturer name and trademark (if necessary); packaging date;
JB/T 8437-96
The packaging storage and transportation graphic mark shall comply with the provisions of GB191. 7.2 Packaging
The qualified products accepted by the inspection department shall be packed into the packaging box 7.2.1
together with the product certificate, instruction manual, packing list and spare parts, etc., and the box shall also be filled with moisture-proof packaging materials. 7.2.2The packaging of the product shall comply with the provisions of GB/T3873. 7.3 Transportation
The packaged products shall meet the transportation requirements of any means of transportation, and shall be protected from direct rain and snow and strong vibration and impact during transportation. 7.4 Storage
Packaged products should be stored in a ventilated warehouse with a temperature of -10 to +40°C and a relative humidity of no more than 80%, free from strong electromagnetic fields and other corrosive gases in the air. 8 Warranty period
The manufacturer should ensure that the supplied products can work normally within 12 months from the date of use, but no more than 18 months from the date of shipment, under the conditions of proper storage, reasonable installation and correct use by the user. Additional notes:
This standard was proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Beijing Hoisting and Conveying Machinery Research Institute and Nanjing Hoisting Electric Appliance Factory No. 3. The main drafters of this standard are: Huang Guodong, Qiu Weizhang, Cui Zhenyuan, Wang Haiding and Zhai Houzhong. 75
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