Harbin 150036 Harbin 150006 Harbin dynamic control mode to transform the air compressor system to achieve energy saving and consumption, to ensure safe and reliable continuous operation of the system.

1 System Overview In the energy loss of large-scale production and processing enterprises, the high-power air compressor system can not automatically adjust the air compressor speed according to the actual air volume change. Or because the air compressor system is selected, the power is too large. It caused a lot of power to be consumed in vain. How to reduce power consumption and improve the economic efficiency of enterprises. It has been paid more and more attention to the person in charge of the company. Due to the use of frequency converter speed control, the air compressor soft start, soft stop to avoid the impact of direct start on the grid and also avoid the mechanical impact on the air compressor. Extend the life of the air compressor.

The two air compressors are equipped with a pressure sensor intelligent instrument to form a full-closed control. Usually, the inverter only has an air compressor when working, and the air compressor can be selected by switching mode. At startup, the frequency converter is equipped with an air compressor running to an economic frequency of 45, when the pressure is insufficient. The input section speed is 50 hugs. The pressure is still not enough after 5 minutes. At this time, the inverter is stopped and cut into the power frequency operation. When the pressure reaches the upper limit, wait for 5 seconds to stop the power frequency.

When the pressure drops to the lower limit, the inverter is input and the above operation is repeated. All kinds of states are indicated by the light finger.

2 system configuration 5 air pressure system equipment configuration is as follows, Mvm075kW inverter, Chint open, Siemens AC contactor, Siemens Qiao 3 uses two inverters with 101081 ft 440 inverter as the core to replace the original star control cabinet .

3 main adjustment parameters of the inverter terminal block input selection command signal source P0701=l turn on forward rotation select digital input 1 function P1000=2 analog input frequency set value signal source 1080=30 his lowest frequency setting lowest Motor frequency. When running at the lowest frequency, regardless of the frequency setting value, the maximum frequency of the motor is set to 1082=50. When running at the highest frequency, regardless of the frequency setting value, P20=30s ramp-up time ramp function curve without the smooth arc when the motor accelerates from the stationary state to the highest frequency, the time used by 1082 21=3,3 ramp down Time ramp function curve When the motor decelerates from the highest frequency 82 to the stationary parking time without a smooth arc 4 Electromagnetic compatibility EMC anti-interference measures Equipment or system can work normally in its electromagnetic environment and is not fully loaded in the environment, not fully Consider the question of electromagnetic compatibility. If it is small, the device will not operate stably, and if it is large, it will cause damage to the device. Currently ugly has become a system failure 4.1 to minimize the impact of 0 should take measures 1 to ensure that all equipment in the transmission cabinet is well grounded. Use short and thick ground wires to connect to a common ground or ground bus. It is particularly important that any control device, such as station 10, connected to the frequency converter be co-located with it. Also use short and thick wires to ground. It is preferable to use a flat conductor such as a metal mesh because of its low impedance at high frequencies.

3 When installing the inverter, it is recommended to use the lacquer-free galvanized steel plate to ensure a good electrical connection between the radiator and the mounting plate of the inverter.

3 In order to effectively suppress the radiation and conduction of electromagnetic waves, the motor cable of the inverter must be shielded cable, and the conductance of the shielding layer must be at least 0.

4 Control cables are best used with shielded cables. In general, the shield of the control cable should be grounded directly inside the inverter, and the other side should be grounded through a small high-frequency capacitor such as 3.31 plus 3000. When the differential mode voltage across the shield is not high and connected to the ground, the two ends of the shield can be directly grounded. The signal line and its return line are twisted together to reduce the interference caused by the inductive coupling. The closer the stranding is to the terminal, the better. The transmission line of the analog signal should use a double shielded twisted pair. Different analog signal lines should be routed independently. There are separate shielding layers to reduce the inter-line 晷 do not put the 晷 信号 signal, the towel (5) shield continues on the same common return line. Low-voltage digital signal lines are preferably double shielded twisted pair or single shielded twisted pair 2. Transmission cables for analog and digital signals should be shielded and routed separately. Do not share the same cable slot with the 2400 and 5230 into the 0 signal!

Voltage and mains voltage spikes. The line reactor is connected in series between the power supply and the inverter power input. If a filter is also used. Then the 1 filter should be connected in series between the line reactor and the inverter.

7 Ensure that the contactor in the conducting cabinet has an arc extinguishing function, the AC contactor adopts a ruler 0 suppressor, and the DC contactor adopts a flywheel pole tube to be wound into the winding.

Varistor suppressors are also very effective. When using a switch inductive component, the resulting transient voltage can sometimes be as high as 41. The frequency can reach 200 shirts.

Cold design of the regional principle to pay attention to when controlling the cabinet, planning different equipment in different areas. Each zone has different requirements for noise emission and immunity. The area is preferably spatially separated by a metal shell or by a grounded partition in the cabinet.

4.2 In the electromagnetic compatibility design of the wiring shield and shield connection should pay attention to the problem 1 double-end shielding, the shielded cable is the two known metal chassis. And ensure that a large area of ​​contact with the metal surface to withstand the frequency interference, if the system is connected to external equipment when repairing and starting power, such as printers, programming equipment, personal computers, shielding components of the connecting cable must also double-end connection row double The shielded double-wire single-twisted twisted pair 5 motor cable should be independent of other cable traces, the minimum distance is 500. At the same time, the motor cable and other cables should be avoided to run parallel to the long distance, so that the inverter output voltage can be reduced quickly. Electromagnetic interference caused by changes.

If the control cable and the power cable cross. They should be crossed as far as possible at a degree of 9. Also secure the shield of the motor and control cables to the mounting plate with suitable clamps.

Line reactors are used to reduce the harmonics generated by the frequency converter and can also be used to add source impedance. It also helps to absorb the surge of electricity generated by nearby equipment when it is put into operation. If the shield is only grounded at the end, interference may also occur on the cable.

3 Single-ended shielding special cases In rare cases, only end shielding can be performed, for example. Pure analog system without digital components. Shielding at the end provides only electrostatic protection against low frequencies and the ability to couple absorption and emissions. When the disturbance is caused by the external ground potential difference, in some cases, even if the elements of different potentials can be coupled together, an equipotential is formed. Here. It may also be necessary to connect the end of the shield terminal to the ground. In order to increase the effectiveness of shielding. The shield end of the open end can be connected to the outer casing.

3 The shielding connection point of the single-ended shield must be the electrical reference ground of the coupling component. If both the source and the receiver are floating in both sides of the connection, the shield must be connected to the receiver. If both the source and the receiver are grounded, the shield must be connected at both ends.

In principle. Only specially designed plug and connector housings can be used to extend the interrupted shield. But in addition, in some cases, it is absolutely necessary to break the shield connection from the cable plug. At this time, the shield of the cable is screwed to the shield busbar before and after the plug terminal. 4 identifies the basic installation method for the terminal block jumper connection. Install the shield connection just before the cable enters the electrical cabinet, and then connect the cable to the module. For semi-finished cables that require user assembly for a specific product, it is designed to provide a reliable shield connection and use screws to connect the plug to the outer casing of the component.

5 Application effects Frequency conversion power saving technology has been widely used in the world and in China in recent years.

By changing the operating frequency of the motor. The motor frequency is changed to change the air flow and the pressure is constant to achieve energy saving.

In the conventional gas supply system, since the air compressor is constant at the rated speed for a long period of time, when the load is low, the air flow rate cannot be correspondingly changed, thereby causing waste of energy. If the frequency conversion technology is used for transformation, the air flow rate can automatically adjust the air compressor speed according to the change of the production gas volume, so that the air supply pressure is stable, and the energy loss is reduced under the premise of ensuring the normal operation of the system, and the energy saving effect is very obvious.

According to the plant operation record, it is put into operation by two air compressors. Continuous operation for 24 hours, the calculation of power consumption is as follows. After the inverter control, the energy saving of the air compressor reaches about 20. According to the above calculation, the energy saving of the air compressor unit is about 262800 degrees per year.

The enterprise saves cost 262800 degrees 0.6=157680 yuan. Because the fan type load is the variable torque load, the fan motor consumes power and its air volume establishes the relationship. As long as the motor speed drops a little. The power consumption of the motor will drop dramatically. Frequency conversion energy-saving technology is based on this principle. The air volume is controlled by changing the frequency of the motor to control the air volume. The implementation section is connected to page 4 for automatic acquisition of component information data. In the production, the component identification code is used to monitor the production, the production test data is collected, the production quality inspection data is collected, the product completion inspection is performed, and the component identification code and the product file are established. Arrange production plans in an orderly manner. Monitor production and flow, and improve the pass rate of products.

6.2 Transportation Warehousing Management Railway Transportation Air Transportation Postal Communication and many other industries have goods that are unloaded to the designated car or flight manufacturer if they produce hundreds of varieties of products. And need to sort them into different destinations, then you must expand the venue and add personnel. There are also often human errors.

The solution to these problems is to apply logistics RFID technology to automatically sort parts or products to different transport planes.

In the warehousing system. The electronic information tag can be used to distinguish the component information and process the information through the computer. The basic invoicing management of the warehouse helps to achieve reasonable inventory preparation, effectively reduce inventory costs, improve production efficiency, and facilitate the rational use of corporate funds.

6.3 Overhaul management For parts maintenance, there are often strict rules and regulations to overhaul the process. Before the start of maintenance and repairs, it is necessary to perform performance verification on the equipment of important posts before starting work. The radio frequency information tag can be used to store the inspection status of the component, and the portable reader can automatically read the inspection status information. If the procedure is not met, the process and the next operation program cannot be opened, thereby controlling the illegal operation on the site, and realizing the real operation. Program control. The module is used to convert the original files from manual stations to automatic data collection to ensure the data source.

Frequency rotation speed reduces air volume and reduces power drop. In addition to the design requirements, pressure and flow closed-loop control, Siemens frequency converter series can also select the inverter's unique energy optimization control program to automatically find the lowest point of motor energy consumption.

6 After the completion of the transformation, not only saved a lot of energy. At the same time, automatic control is realized, which greatly reduces the labor intensity of the operator. The current and mechanical impact of the start and stop of the unit are reduced, the service life of the unit is prolonged, and good economic benefits are obtained.

Therefore, after using the variable frequency speed control system, the aspect can save a lot of power, and greatly reduce the maintenance work, and ensure the safe and reliable continuous operation of the system.

During the use of the system after the system was rebuilt, the system achieved trouble-free continuous operation and was well received by users. Fu, the reliability of the cyan, with the error prevention of entering data, the check and check acceptance control procedures in each process and other functions to ensure the quality of the maintenance through the application interface with the twist 488 travel system for data exchange. Thereby achieving data sharing. The travel kilometer data is written into the information tag, thereby completing the component maintenance from the original time to the direction of the mileage repair and state repair.

6.4 Scrap Recycling Management The data exchange of the radio frequency information tag usage management system can conveniently store the manufacturing information of the parts, the distribution information, the information of the maintenance information, and the like. Based on this information, the vehicle component scrapping database is formed according to the management model of the scrapped parts, and the scrap recycling process of the components is completed by the on-site automatic sorting system.

6.5 The application management system is not isolated information. Through the perfection of the workshop-level management module and the perfect integration with other information systems, the management application can be realized.

Establish functional management such as enterprise plan implementation, production organization quality control technology management, leadership decision-making leadership query.

7 Application prospects With the advancement of technology and the improvement of production and processing technology, the manufacturing cost of radio frequency products has declined, and the application of radio frequency technology will surely enter a broad application prospect. With the promotion of the railway leaping development information management system, the sharing of the stomach and the stomach will also bring the promotion and application of radio frequency technology in the railway application field. Zhang Xiaofang

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