In recent years, with the development of power electronics skills, the frequency conversion speed regulation skills have been very mature, practice has proved that the use of frequency conversion speed regulation in the fan, pump load can save 20%-50% of the electric energy, and the use of frequency conversion speed regulation can bring the following advantages in the future, its biggest advantage is that it has obvious energy-saving effect and improve the production process, maintain stable pressure, do not need to be artificially adjusted, so that the entire production process has been automated.
1. Complete soft start and soft stop for the existing motor. Solve the dripping, leakage and ebbling caused by the impact of the motor on the pump and pipe network when it is directly started. There is no impact on the power grid when the motor is started.
2. Complete various protection functions for the motor, because the inverter is an advanced equipment integrating power electronic micro-control skills, which completes accurate vector control through the motor model established by the CPU and the measured motor parameters during operation, and carries out perfect protection for the motor, such as motor overload, overvoltage, undervoltage, overheating, grounding, power supply phase loss, etc.
3. According to the needs of the factory, the parameters are set at one time, and in the future, the inverter will automatically complete the adjustment of the time-varying parameters of the pump according to the practice of water supply, and the whole process will be automated.
4. It prolongs the service life of the pump and motor, and the inverter automatically adjusts the operating frequency to slow down the wear of the pump and the aging of the motor; Keep the entire pipe network at normal pressure and reduce the amount of repairs.
The system is mainly composed of 3 water pumps, 1 Senlan SB200 inverter, pressure transmitter, PLC, etc. The water consumption of iron and steel enterprises is very large, the pump capacity is large, and the pipe diameter of the pipe network is also large, therefore, when the pump is switched, the valve should be controlled, and the pump should be followed by "first throwing the pump, opening the valve", and "closing the valve first, then stopping the pump" when cutting off the pump, which needs to be controlled by PLC.
The pressure is set by the inverter keypad, the pressure transmitter PT sends back the reaction value of the pipe network pressure, and the built-in PID conditioner of the inverter compares the reaction value with the pressure transmitter according to the given value, so as to control the running speed and number of pumps, the inverter pump is running at the speed, and then the pressure of the pipe network is constant. If it is a small-capacity pump, there is no need to use PLC to control the valve, and the multi-pump switching function can be completed by the built-in constant pressure water supply software element of Sunland inverter, which is simple to use and easy to maintain.
In order to get used to the change in water consumption, the number of manual switching pumps was used to regulate the water pressure and flow rate of the pipe network. This results in pressure variations at different outlets of the network, sometimes overpressurized, sometimes underpressurized. The pump unit uses the variable frequency speed regulation skill, that is, the speed of the water pump is changed by adjusting the frequency of the input motor power supply. The centrifugal water pump is a square torque characteristic load, the power consumed by the motor is proportional to the cubic of the speed, after the frequency conversion speed regulation, a lot of electric energy can be saved, to achieve the purpose of energy saving and efficiency increase.
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