Example of simple variable frequency water supply

2022-06-23
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Simple variable frequency water supply control example

with the rapid development of automatic control technology, variable frequency technology has made great progress both in function and stability; The frequency conversion and speed regulation water supply system has been widely recognized by the water supply industry. It can directly replace the water tower, high-level water tank and air pressure tank water supply devices. The frequency conversion and speed regulation water supply system can adjust the pump speed according to the pipe water consumption, and change the water supply volume to achieve the purpose of energy saving; At present, most of the commonly used water supply systems are widely used in construction, heat preservation, packaging, freezing, and daily necessities. The full dead cycle cycle (repeat?) The variable frequency water supply system is superior to the traditional water supply system in terms of system protection, working stability and equipment service life. Therefore, the variable frequency water supply system has become an inevitable trend in the field of water supply equipment in the future

2. Control introduction

at present, the commonly used variable frequency water supply system is roughly divided into two parts: one part is to directly connect to the water supply system by using the special frequency converter for fan and water pump, use the remote pressure gauge to collect the pressure signal in the water supply pipe, directly send it to the input terminal of the frequency converter, control it according to the internally set parameters, directly drive the water pump to control the water supply of the water supply pipe, and the functions such as wheel pump are also completed by the frequency converter, This method is mostly used in control systems above 5.5kW. The other is to use a water supply control box and a frequency converter. A remote pressure gauge is used externally to collect the pressure signal in the water supply pipe, which is directly sent to the input terminal of the water supply controller. The frequency converter is controlled according to the parameters set in the controller. The frequency converter drives the water pump to control the water supply of the water supply pipe. The functions such as wheel pump are completed by the water supply controller. I have adopted a simple water supply method for the control system of domestic water for the first residential building in Panjin, and basically achieved the variable-frequency water supply function. I will introduce it to you below

3. Configuration of simple variable frequency water supply control system:

frequency converter: vfd037a43a,

1pressure gauge: MPa slip resistance control pressure gauge,

2pressure gauge: MPa three position control pressure gauge,

relay between operation steps of rubber fatigue tester: sjc-30,

water pump 2.2kW,

other contactors, etc

see the manual for the schematic diagram of the simple variable frequency water supply system

inverter parameter setting:

pr00:d01, pr01:d01, pr03:d35, pr04:d35, pr05:d380,

pr06:25, pr07:d50, pr08:d1.3, pr09:10, pr10:d4.0,

pr11:d30, pr24:d01, pr36:d35, pr47:d35, pr57:d03,

pr71:d01, pr76:d01

4. Working principle of the simple variable frequency domestic water supply control system:

when supplying water to the pipe, first, 1p pump is powered by the frequency converter, and the pump motor turns to the durometer. The non operating speed changes with the change of the 1pp remote pressure gauge's voltage output to the frequency converter control signal. The actual setting is 4.5MPa (that is, the variable resistance in the remote pressure gauge is 5kohm at 4.5MPa) to maintain the stability of the pipe pressure; In fact, the system is to ensure the domestic water consumption of 48 households in a six story building. I adjusted the maximum operating frequency to 35Hz to meet the pressure (4.5MPa) requirements of the pipe; When the pipe water pressure is lower than 3Mpa for more than 10 minutes, the frequency converter has operated at 35Hz for 10 minutes, and the 2\; pump will be activated until the pressure reaches 3Mpa; When the pressure of the water supply pipe exceeds 8Mpa, the 1# pump will also stop working

5. Conclusion:

because some small-scale residential water supply systems have good operating environment, small control power and low control accuracy requirements, it is unnecessary to use complex water supply controllers; Simple water supply control system can meet the requirements. The wiring and installation are very simple and the cost is low, but the maximum operating frequency of the frequency converter should be adjusted well during commissioning to avoid the water hammer effect in case of frequent overpressure shutdown; The system has no wheel pump function and can only be replaced manually during maintenance every half a year; Undervoltage protection, overvoltage protection, short circuit protection, overcurrent protection and other functions are completed by the frequency converter with reliable performance. The system has been used on the site for 6 months. If it is used in other small occasions where the accuracy of water supply control is not high, there is no problem

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