Water pump can not meet the backwash effect of backwash system reason and solution

Water pump control cabinet status quo and existing problems in the sewage treatment station, normal filter, filter material in the filter tank is compaction; When after the completion of the filtering process, the guide process, start backwash pump, filter materials are washed up. Need to control in the process of backwash backwash intensity, low intensity, short of backwash effect; The distribution of the strength, can destroy the filter layer. As a result, the backwash pump outlet manifold is equipped with flow meter and control valve, technological requirements once every 12 h to filter tank to an automatic backwash, secondary filter tank every 24 h for an automatic backwash. The following problems: (reverse wash process 1) Fluid control cabinet power frequency startup, the pipe through the process of a sudden start, when the filter material harden degree deeper overall jacking, easily lead to filter tank internal sieve basket, sieve plate, pipes and other parts damaged, thus resulting in the loss of filter material. Not only water quality is poorer, and often should add filter material, waste money. （ 2) Sewage treatment station in the secondary filter tank must carry on the back flush, each filter in the processing of flow resistance characteristics vary, and process is only 10 minutes, backwash strength changing with time curve is very difficult to grasp well. For different filter tank, workers with only experience control valve opening to control water and intensity, do you want to be good backwash effect is almost impossible. Second, backwash system can not meet the backwash effect of solution

1, the control scheme adopts frequency conversion control cabinet design, 1) Frequency conversion control GuiZhu circuit design

by inverter, low-voltage circuit breaker, fuse switch, contactor, reactor and so on main circuit. , according to the requirements of process and equipment for the design of main circuit power frequency/frequency and power frequency/power frequency combination way, meet the requirements of the safety and continuous production. At the same time, using the reactor can inhibit the frequency converter of high order harmonic pollution to power network, to prevent interference with the sensitive electronic equipment, conform to the EMC standards. （ 2) Frequency conversion control cabinet control circuit design

by Siemens s7 & ndash; 226, PLC programmable controller, TD200 text editor, relay, flowmeter signal of the closed loop control part of the variable frequency speed regulation system. Can realize the local/remote start-stop control, power frequency/frequency operation mode selection, automatic fault detection and automatic/manual control tasks. When conditions change, the workers can be installed in frequency conversion cabinet disk TD200 text editor, change the backwash intensity, backwash operation time and rise time. Frequency conversion runtime PLC through the PID arithmetic processing traffic signal, the output frequency regulation of 4 ~ 20 ma signal, adjust the motor speed, change the discharge and delivery lift water pump, backwash pump meet the requirements of the pressure and flow of process, control flow and pressure. Frequency conversion control cabinet PLC contact of on-line detection of ac contactor, ensure the inverter in the motor overheating or stall can automatically stop when running; On-line detection of low voltage circuit breaker contact, prevent the inverter in the power supply under the impact of instantaneous power lost due to damage of the inverter. Contactor, relay interlocking, interlocking PLC interlock internal programming triple interlock protection to ensure the safe and reliable operation of the system; At any time during operation monitoring the state of the inverter, frequency conversion controller PLC, low-voltage electrical, found the fault processing immediately and report to the police, emergency situations can be shutdown automatically, to ensure the safety of the key equipment. Provide all kinds of signals and status indication, operation of the system can be observed visually. Frequency conversion control cabinet control strategy and programming ideas ( 1) Safe and reliable frequency conversion control cabinet:

due to the site environment is relatively bad, serious electromagnetic interference, and the inverter and the controller itself also produced the strong electromagnetic interference and the high harmonics, so the anti-interference performance and error correction ability is a leading indicator of control circuit. Through hardware combined triple interlock and PLC software programming, effectively improve the safety and reliability of the system. （ 2) Frequency conversion control cabinet redundancy design:

low-voltage electrical appliances and other main switch components such as electrical and mechanical performance, after all, not so little spare electric appliance is used to complete the redundancy design. In the main equipment normally available for few circuit complete control tasks at the same level at the same level. Design the start-stop redundancy of transducer, the frequency converter control redundancy, start the pump running redundancy. Three redundant circuit to ensure the inverter abnormal system can still run continuously, improve the running rate of the system. （ 3) Frequency conversion control cabinet fault monitoring:

runtime on-line detection system running state, real-time processing and report to the police. To increase the safety and reliability of the system, and in the system during normal maintenance to provide the necessary technical data and facilitate fault location, reduce maintenance intensity. Conclusion the four joint station, apricot apricot 51 'joint station, apricot joint station has been using the system. With common pump to wash the walnut shell filter as an example, by applying the backwash frequency control of motor speed control, not only can wash the filter layer on the surface of the oil and impurities, and makes oil filter material lining and turn to filter layer surface impurities and rushed out, with the water filter material clean more thoroughly, raised the qualification rate of injected water quality.

related products: water pump control cabinet

can control water pump with frequency conversion control cabinet are: pipeline centrifugal water pump, also can use directly with inverter control using multistage pump products.

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