Power on to open the frequency converter, manually operate the given frequency knob to make the gas compressor run at low speed. After the equipment is running normally, switch to automatic, and transmit the medium pressure pipe network gas pressure signal to the inverter, after the internal PID operation. Given the power supply frequency, determine the speed of the gas compressor. When the pressure of the medium pressure pipe network is lower than the set pressure, the frequency increases, the motor speed increases, and the gas intake amount increases; when the medium pressure pipe network pressure is higher than the set pressure, the frequency decreases, the motor speed decreases, and the gas suction is reduced. the amount. When the gas pressure before the machine, the operating temperature of the press machine, the oil pressure, the oil temperature, the temperature of the circulating water, and the pressure exceeding the limit, the press machine automatically stops, thus achieving the automatic adjustment and control of the gas pressure and ensuring the pressurization. The machine itself runs safely.
The implementation of the transformation uses two G5A4110 inverters to take four gas compressors in the form of one to two, switching to the state of two-purpose and two-standby, and the remaining one compressor is used as a backup for frequency conversion maintenance. In the transformation, only the original four auto-coupling step-down starter cabinets were removed, two inverter control cabinets were installed to realize the free switching of the gas compressor, and the bypass valves of the four gas compressors were changed into electric valves. To achieve no-load start or stop of the compressor. At the gas compressor outlet, a pressure detection and differential pressure transmitter 1151GP6E33M1B1 (range 0kPa ~ 250kPa) is set, and the gas pressure signal is transmitted to the frequency converter at any time to realize the automatic adjustment of the gas pressure to ensure the stability and goodness of the pipe network system. The quality of the gas supply.
On-site control signals such as gas pressurizer temperature, cylinder temperature and pressure, lubricant pressure and temperature, circulating water pressure and temperature, pre-machine pressure, medium pressure pipe network pressure, etc. are connected to the programmable controller, and the programmable controller is controlled. The signal is input to the inverter.
The control system also adopts an acoustic and optical alarm device for the upper and lower limits of the gas pressure of the medium pressure pipe network, the upper and lower limits of the height of the gas storage cabinet, and the electromechanical failure of the frequency converter and the gas compressor to reduce the occurrence of sudden accidents. Improve the life of your equipment.
In addition, since the user uses relatively little air at night (1:00 to 5:00), the pressure in the medium pressure pipe network is large, and the running load of the gas compressor motor is small, the motor is running at low frequency and low speed, and the running time is long. As a result, the temperature of the motor winding rises sharply, even exceeding the allowable temperature rise of the motor insulation, causing forced parking, which seriously affects production. In order to ensure that the motor has a certain speed, the heat and heat are balanced, and the minimum limit frequency is controlled at around 20 Hz. It can also be used with the bypass valve to adjust the opening and closing of the bypass valve according to the gas pressure of the medium pressure pipe network, so that the compressor is in stable operation.
According to the energy-saving analysis, when the gas compressor is under full load, the operating current of the motor before the inverter system is 155A, the operating power is 102kW; after the inverter system is used, the running current of the motor is 116A, the running power is 76kW, and the power is turned on for 20h every day. One year can save electricity: W = PT = (102-76) × 20 × 360 = 187200 (kWh) calculated by 0.375 yuan per kWh, can save electricity costs: 0.375 × 187200 = 70200 (yuan) 5 conclusion implement gas compressor After the variable frequency speed control, the wide range of stepless speed regulation and soft start of the motor and the start and stop of the non-contact switch are realized, which overcomes the large current impact of the original starting mode of the asynchronous motor and the corrosion of the switch contact, the burning and the damage. The downtime accident has extended the service life of the equipment. At the same time, according to the load of the medium pressure pipe network gas pressure, the speed of the gas compressor is automatically adjusted to avoid the occurrence of gas pressure fluctuations, small pressure before the stove and overloading of the gas pipeline, ensuring pressure stability.
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