1, which has the functions of over-voltage, under-voltage, overload, short circuit, phase failure and low liquid level.
2. The adjustment precision is high, generally reaching 0.0 1MPa, and the system pressure is always maintained at the set value.
3, simple and convenient operation, with automatic fault storage and fault display functions. The pressure can be set directly from the keyboard.
4. It has the advantages of high efficiency and energy saving. If it is used with a pneumatic tank, the effect is better, and the energy saving rate is 20%~50%.
5, double pump timing switching function. One for use and one for standby control.
6. Compact structure, small floor space and convenient maintenance.
PID control principle of variable frequency and constant pressure water supply equipment
According to the feedback principle, if we want to keep a physical quantity unchanged or basically unchanged, we should compare this physical quantity with a constant value to form a closed-loop system. If we want to keep the water pressure constant, we must introduce the feedback value of the water pressure to compare with the given value, thus forming a closed-loop system.
However, the controlled system has the characteristics of nonlinearity and large inertia. At present, the method of combining control with PID adopts fuzzy control when the pressure fluctuates greatly to speed up the response. When the pressure range is small, PID is used to maintain static accuracy.
This algorithm can be realized by PLC and intelligent instrument, and the programming of PLC can switch between the power frequency and frequency conversion of the pump. Practice has proved that this method is feasible and the cost is not high.
In order to keep the pressure of water supply network constant, the frequency conversion constant pressure water supply equipment installed a pressure transmitter as a feedback element in the management of water supply network system according to the feedback theorem. Because of the long pipeline, large pipe diameter and slow pressure in the water supply network, the system is a large lag system, which is not easy to be directly controlled by PID regulator. PLC is used to adjust the control system.
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