Before the equipment is put into operation, the operating parameters such as working pressure of the equipment should be set first. When the equipment is running, the pressure and water pressure change rate signals in the water supply pipe network are collected continuously by the pressure sensor, and converted into electrical signals. In the variable frequency control system, the control system compares and calculates the feedback signal with the set pressure. If the actual pressure is lower than the set pressure, an instruction is issued to control the pump to run at an accelerating speed. If the actual pressure is higher than the set pressure, then the pump is controlled to reduce speed. In operation, the pump is maintained at this operating frequency when the set pressure is reached. If the variable frequency water pump reaches the rated speed (frequency), after a certain period of time is judged, if the pipe network pressure is still lower than the set pressure, the control system will switch the water pump to the power frequency operation and start the next pump with variable frequency. Until the pipe network pressure reaches the set pressure; conversely, if the system water consumption decreases, the system commands the pump to run at a reduced speed. When the effective speed of the pump is reduced, the pump that is started first in the running pump stops operating, that is, the pump is reduced. The number of running until the pipe network pressure is constant within the set pressure range. The main pump stops working, and the auxiliary pump for water supply is also a frequency conversion constant pressure water supply method, which further improves work efficiency and saves energy.
Energy efficient. According to the need to set the water supply pressure, according to the pipe network water consumption to variable speed pump adjustment, so that the pump is always running in high efficiency conditions, compared with the ordinary non-tower water supply equipment, energy-saving effect of 20%.
The impact on the grid is small and the protection function is perfect. Eliminates the impact and disturbance on the power grid when the pump motor is directly started, and the equipment control system has various protection functions such as short-circuit, over-current, over-voltage, overload, under-voltage, and overheating, which greatly improves work efficiency and prolongs the use of the water pump. life.
Man-machine interface touch panel operation, setting parameters flexible and convenient. It can flexibly set various operating parameters such as frequency lower limit, acceleration time, deceleration time, pump change time, etc. It can display the system running time and consult the causes of various faults.
Timed wake up function. Since the system decides the number of pumps to be put into operation according to the amount of water used in the pipeline network, when a long-term change in the water consumption within a certain small range causes a certain pump to run for a long time and wear out badly, and other pumps are not used for a long time. Rusty, this function can be easily solved after setting this function. For multiple pumps of the same flow rate, the timed pump change function must be set in order to make the average working time of each pump the same. After the scheduled pump change function is set, when a variable pump continuously exceeds the set value and the variable pump is in the "rest" state, the inverter automatically switches to start the variable pump with the longest "rest" time. And stop the original variable pump to ensure that each pump running time equal, extend the service life of the pump. The pump change time can be set arbitrarily.
When the inverter fails, it can automatically switch to the power frequency operation to ensure uninterrupted water supply. After a sudden power failure, the device can automatically start operation.
Scope of application
Widely used in residential areas, hotels and other public buildings, such as domestic water, boiler supply water, pressurized pumping stations, production water for various types of industrial and mining enterprises, fire-fighting water, boiler constant pressure water supply, oil pipeline pressurization, water injection system, farmland irrigation Wait.
Frequency conversion constant pressure water supply system