Frequency converter on the highway - Power Circuit - Circuit Diagram

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Photocoupler

1 Introduction On the expressway, there are many toll stations. There is a railing machine on each entrance and exit lane. The transmission of the railing machine needs inverter drive. Most of these toll stations are far from the city, and the living quarters of the toll stations are not likely to be supplied by urban tap water. It is common to hit a well on the spot and pump groundwater to meet the needs of life. This requires a small water supply system. There is a service area every 50 to 60 km between the highways. These service areas are also far from the city and require an independent water supply system. In the country, the number of highway toll stations and service areas is numerous, and the variable frequency constant pressure water supply system is an inevitable choice. In addition, frequency converters are also used in ventilation systems with longer tunnels.

2 The application of the inverter on the railing controls the start and close of the expressway. The railing machine consists of a metal chassis (orange), a motor, a reducer, a frequency converter, a dynamic balancer, a control cam set, a crossbar, and a tamper detector. The controller consists of two parts of the circuit, one part controls the crossbar movement of the gear shifter; the other part is used to process various input and output signals, such as anti-smash processing, 119 alarm processing and waiting for release function. The railing machine is connected to the entrance terminal and the exit terminal to control the opening and closing of the lever. The lever length is 3m or more. The shift lever can be operated continuously from 0 to 90° without overloading. The time for opening and closing the lever is less than 5s, and it can be operated 10,000 times a day. The power supply voltage of the railing machine is 220v AC. Because the highway toll station is far away from the city, most of the power supply is taken from the agricultural network. The supply voltage of the rural network is unstable, and the voltage fluctuation reaches ±20%. The requirements for the inverter are: frequent start and stop, rapid acceleration and deceleration, power supply voltage for wide range fluctuations, smooth running, accurate lifting of the railing, and falling position. Generally, the railing machine is installed in the wild. The ceiling of the toll booth can block the rain from above, but it can't stop the rain from the side when the wind is strong. Therefore, the railing has a closed chassis for installing the inverter and electrical appliances. Control System. The frequency converter is installed in a closed space with little space, and will not cause overheating trip when the temperature is high in summer. Because the installation location is limited, the size of the inverter is required to be as small as possible.
It is hoped that the Senlan sb40d series inverter is a high-performance general-purpose inverter with high starting torque. The design uses a unique tree-shaped radiator to make the fuselage ultra-small, and the production adopts the patch technology to make the machine reliability. Greatly improved, built-in plc function, igbt, ipm intelligent power module ultra-quiet operation, multi-channel programmable function output terminal and relay output terminal, the input voltage range is allowed to be between 176v ~ 264v. In a highway toll station with the hope Senlan sb40d0.75kw inverter control railing, the inverter settings are as follows: f02 = 1 running command is controlled by the terminal, f08 = 0.7 acceleration time 0.7s, f09 = 0.7 deceleration time 0.7s, F31=0.1 starting duration 0.1s, the rest are according to the factory value. After the railing machine uses the frequency converter, the acceleration/deceleration time can be adjusted arbitrarily. The acceleration/deceleration time is set to 0.7s here. The gear lever is operated hundreds of times to thousands of times per day. The bar movement is stable and free; the input voltage varies to ± After 20%, there was no trip due to voltage fluctuations, and good results were obtained.

3 There are many staff members in the constant pressure water supply expressway service area and toll station of the expressway service area and toll station. The place where people live must use water, and the service area and toll station are generally far from the city. The city's water pipe network has to supply water. The area and station by the river are always a minority. Therefore, most areas and stations take groundwater. If the iron and manganese content exceeds the standard, it will be treated by violent treatment, then precipitated and filtered to be used as domestic water. There are not many people in these areas and stations. The water consumption in peaks and valleys varies greatly. The water supply system without frequency conversion will cause great waste of electric energy. Therefore, the most common ones are made into variable frequency constant pressure water supply systems. In this way, when the water consumption is small, the frequency converter automatically reduces the frequency, the speed of the water pump motor becomes slower, and the power consumption decreases drastically. The inverter enters the sleep state, that is, the inverter stops running, but the water pressure of the pipe network is still being monitored. Due to the leakage of the pipeline, when the water pressure of the pipe network is lower than a certain value, for example, 65% of the set value (this value can be arbitrarily set), the inverter restarts, and the pipe network water pressure starts to rise again, to the setting. When the value is still no water, after a while the inverter goes to sleep again. In this way, the automatic start and stop of the pump can be realized without the intervention of personnel, and the power saving will be more significant. It can also be seen from the above process that the greater the difference between the peak and the trough of water, the less leakage of the pipeline and the more significant the power saving.
4 Variable-frequency constant-pressure water supply system at the toll station There are more than 20 toll stations on the expressway, 10 kilometers away from the nearest city, and a small water supply system is built for domestic water. Choose the right place, take a 30m deep well, the groundwater quality is not bad, the bacteria content is lower than the tap water drinking standard, after precipitation, it is the quality of domestic water. The pump uses a 22kw deep well pump and is hoisted in a well water 28m away from the wellhead. The well water is pumped up to enter the sedimentation tank. After filtration, two 15kw water pumps (one for one) are used to send the water into the pipe network for use. The main circuit schematic diagram and control principle diagram of the variable frequency constant pressure water supply system are shown in Fig. 1 and 2 is shown.

Figure 1 Schematic diagram of the main circuit of constant pressure water supply