There are 4 water pumps in the water supply system, of which the motor power of 2 pumps is 75KW, the other two are 11.5 KW (2#) and the one is 7KW (1#). The original start-up mode is Y-â–³ step-down start. Normally, two large pumps and one small pump are turned on. However, the following problems occur during the actual operation:
(1) Because the electric furnace load changes greatly, it is easy to cause voltage fluctuations, causing pressure loss of the AC contactor and stopping the water pump.
(2) The fluctuation of export water pressure is large, causing an impact on the pipe network and often causing multiple leaks in the pipeline.
(3) When the water pressure of the electric furnace is high and low, the cooling effect is not ideal, and the maintenance of the equipment is large. Based on the above reasons, and in order to achieve the purpose of energy conservation, the converter's transformation project was carried out.
The frequency conversion of the water pump motor (3#, 4# water pump) is controlled by the PLC and the frequency converter, and the 1# pump can be manually adjusted. (3 #, 4 #) pumps can be used for mutual backup, (3 #, 4 #) at the same time for frequency conversion operation, 2 # pump to do PLC frequency operation Y-â–³ step down. This makes the mode of operation very flexible and facilitates the overhaul of the equipment.
The PLC control requirements of the constant pressure water supply system are as follows:
There are three pressure sensors K1, K2, K3 in the wall. K1 is the wall pressure is less than the rated pressure, K2 is the wall pressure is rated, K3 is greater than the rated pressure.
In automatic control, when the water consumption is low, the pressure increases and K3 is turned on. At this time, only one motor starts to stop (the user also uses water when the motor stops, so one motor does not stop, that is, 2#) when the water is used. For a long time, when K1 is turned on, it needs three starters (2#, 3#, 4#). When K2 is turned on, it means the water pressure is normal. At this time, two motors are started (2#, 3#), and the pump starts to indicate , so use 380V indicator light.
Manual control; use button control (start/stop individual control) four motors.
Automatic control/manual control using rotary switches (C-NO automatic, C-NC manual, C common)
(1) Summary (If the design being done has something special, it must be clarified);
(2) PLC external wiring diagram, and electrical diagrams of other related equipment;
(3) The breakdown of PLC programming components shall include the set values ​​of components such as timers and counters;
(4) The complete program data should include two kinds of procedures such as PLC process chart and ladder diagram;
(5) List of electrical components; Application range:
This equipment is suitable for various residential quarters, schools, hotels, hospitals and other high-rise building life water supply, all kinds of water plant secondary pressure pump station and other types of water supply needs to be used for secondary water pressure upgrade.
Equipment Introduction:
Frequency conversion speed regulation is to set a constant pressure point in the water supply. When the actual pressure of the pipe network is higher than the constant pressure point, the frequency output of the microcomputer-controlled inverter drops, which causes the pump speed to decrease, and thus the pressure decreases. Conversely, let the frequency output rise. In order to achieve constant pressure water supply. According to the basic principle of fluid mechanics, when the water pump frequency conversion speed control alternative valve for flow adjustment, the energy-saving effect is very significant.
Equipment advantages:
First, direct docking with the water pipe network, do not build a pool, set up a water tank.
Second, saving more than 13%, compared with the regulating valve, can save 40% to 50%. .
Third, comprehensive investment savings of more than 60%.
Fourth, water supply security and good water quality.
Fifth, the intelligent control of the computer will not extend the service life of non-active devices by more than 5 times.
6. After the power outage, the original water pressure of the tap water will still be restored as usual, and the water cut will stop without water.
Seven, fully automatic.
(1) Because the electric furnace load changes greatly, it is easy to cause voltage fluctuations, causing pressure loss of the AC contactor and stopping the water pump.
(2) The fluctuation of export water pressure is large, causing an impact on the pipe network and often causing multiple leaks in the pipeline.
(3) When the water pressure of the electric furnace is high and low, the cooling effect is not ideal, and the maintenance of the equipment is large. Based on the above reasons, and in order to achieve the purpose of energy conservation, the converter's transformation project was carried out.
The frequency conversion of the water pump motor (3#, 4# water pump) is controlled by the PLC and the frequency converter, and the 1# pump can be manually adjusted. (3 #, 4 #) pumps can be used for mutual backup, (3 #, 4 #) at the same time for frequency conversion operation, 2 # pump to do PLC frequency operation Y-â–³ step down. This makes the mode of operation very flexible and facilitates the overhaul of the equipment.
The PLC control requirements of the constant pressure water supply system are as follows:
There are three pressure sensors K1, K2, K3 in the wall. K1 is the wall pressure is less than the rated pressure, K2 is the wall pressure is rated, K3 is greater than the rated pressure.
In automatic control, when the water consumption is low, the pressure increases and K3 is turned on. At this time, only one motor starts to stop (the user also uses water when the motor stops, so one motor does not stop, that is, 2#) when the water is used. For a long time, when K1 is turned on, it needs three starters (2#, 3#, 4#). When K2 is turned on, it means the water pressure is normal. At this time, two motors are started (2#, 3#), and the pump starts to indicate , so use 380V indicator light.
Manual control; use button control (start/stop individual control) four motors.
Automatic control/manual control using rotary switches (C-NO automatic, C-NC manual, C common)
(1) Summary (If the design being done has something special, it must be clarified);
(2) PLC external wiring diagram, and electrical diagrams of other related equipment;
(3) The breakdown of PLC programming components shall include the set values ​​of components such as timers and counters;
(4) The complete program data should include two kinds of procedures such as PLC process chart and ladder diagram;
(5) List of electrical components; Application range:
This equipment is suitable for various residential quarters, schools, hotels, hospitals and other high-rise building life water supply, all kinds of water plant secondary pressure pump station and other types of water supply needs to be used for secondary water pressure upgrade.
Equipment Introduction:
Frequency conversion speed regulation is to set a constant pressure point in the water supply. When the actual pressure of the pipe network is higher than the constant pressure point, the frequency output of the microcomputer-controlled inverter drops, which causes the pump speed to decrease, and thus the pressure decreases. Conversely, let the frequency output rise. In order to achieve constant pressure water supply. According to the basic principle of fluid mechanics, when the water pump frequency conversion speed control alternative valve for flow adjustment, the energy-saving effect is very significant.
Equipment advantages:
First, direct docking with the water pipe network, do not build a pool, set up a water tank.
Second, saving more than 13%, compared with the regulating valve, can save 40% to 50%. .
Third, comprehensive investment savings of more than 60%.
Fourth, water supply security and good water quality.
Fifth, the intelligent control of the computer will not extend the service life of non-active devices by more than 5 times.
6. After the power outage, the original water pressure of the tap water will still be restored as usual, and the water cut will stop without water.
Seven, fully automatic.
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