KR100686645B1 - Max efficiency operation of a pump and a control unit thereof - Google Patents

Max efficiency operation of a pump and a control unit thereof Download PDF

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KR100686645B1
KR100686645B1 KR1020050045137A KR20050045137A KR100686645B1 KR 100686645 B1 KR100686645 B1 KR 100686645B1 KR 1020050045137 A KR1020050045137 A KR 1020050045137A KR 20050045137 A KR20050045137 A KR 20050045137A KR 100686645 B1 KR100686645 B1 KR 100686645B1
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frequency
pump
efficiency
maximum efficiency
operating
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KR1020050045137A
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Korean (ko)
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KR20060122566A (en
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황수명
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주식회사 다우
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0204—Frequency of the electric current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/11—Kind or type liquid, i.e. incompressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/60—Fluid transfer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

본 발명은 모터펌프 기동시에 전양정이 시작되는 최소유량에서부터 가동하여 주파수를 일정단위로 변화시켜가며 운전시킴으로서 효율이 최대인 점의 주파수를 찾은 후 이를 운전주파수로 설정하여 운전할 수 있도록 하는 펌프의 최대 효율 운전 방법 및 제어장치에 관한 것이다.The present invention operates by changing the frequency by a certain unit by starting from the minimum flow rate at which the full head starts at the start of the motor pump to find the frequency of the point of maximum efficiency and then set the operating frequency to the operating frequency of the pump It relates to an efficient operation method and a control device.

이러한 본 발명은 모터,펌프의 기동시 기본 주파수에서 상한 주파수까지 1Hz 단위로 주파수를 변화시켜 가며 펌프를 운전시키도록 하되 주파수 변화 후 3분의 안정시간을 갖게 하고, 3분의 안정시간이 경과되면 5분간의 데이터를 3초 간격으로 입력데이터를 취득 연산하여 변화를 연산하여 효율을 산출 한 후 저장하며, 1주기 연산 후 최대효율 값을 읽어내어 그 때의 주파수로 펌프를 운전시키도록 하므로서 이루어지는 것으로 최대 효율을 나타낼 수 있는 주파수로 펌프를 운전하게 되어 에너지를 절감할 수 있게 된다.The present invention is to operate the pump by changing the frequency in the unit of 1Hz from the basic frequency to the upper limit when starting the motor, pump, but to have a settling time of 3 minutes after the frequency change, when the settling time of 3 minutes has elapsed It is made by acquiring the input data at 5 second intervals for 5 minutes and calculating the change to calculate the efficiency and then storing it.The maximum efficiency value is read after 1 cycle operation and the pump is operated at the frequency. Operating the pump at a frequency that will give maximum efficiency saves energy.

펌프, 주파수제어, 최대효율 Pump, Frequency Control, Maximum Efficiency

Description

펌프의 최대 효율 운전 방법 및 제어장치{Max efficiency operation of a pump and a control unit thereof}Maximum efficiency operation of a pump and a control unit

도 1은 본 발명의 제어장치 구성도1 is a block diagram of a control device of the present invention

도 2는 본 발명의 최대효율 운전방법 흐름도2 is a flow chart of the maximum efficiency operation method of the present invention

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1 : 전압주파수 변환기 2 : 전력수집기1: voltage frequency converter 2: power collector

3 : 자동전환 스위치 8 : 압력신호 변환기3: Automatic changeover switch 8: Pressure signal converter

9 : 수위검출 신호변환기 11 : 제어 및 감시기9: level detection signal converter 11: control and monitoring

12 : 프로그래머블 로직 콘트롤러 P : 펌프12: programmable logic controller P: pump

본 발명은 모터펌프 기동시에 양정이 시작되는 최소유량에서부터 가동하여 주파수를 일정단위로 변화시켜가며 운전시킴으로서 효율이 최대인 점의 주파수를 찾은 후 이를 운전주파수로 설정하여 운전할 수 있도록 하는 펌프의 최대 효율 운전 방법 및 제어장치에 관한 것이다.The present invention operates from the minimum flow rate at which the pump starts at the start of the motor pump, and operates by changing the frequency by a certain unit to find the frequency of the point where the efficiency is maximum, and then set the operating frequency to the operating frequency so as to operate the pump. It relates to a driving method and a control device.

펌프의 효율은 유량(Q:㎥/min)과 전양정(H:m)에 따라 변하게 되는 것으로, 펌프수동력 Pw=0.163*Q*H [kw]로 정의되고, 펌프 축동력 Ps=수동력/KS펌프 B효율 [kw] 정의 되며, 모터출력=펌프축동력(1+여유율)/전달효율[kw]이 된다.The efficiency of the pump varies depending on the flow rate (Q: ㎥ / min) and the total head (H: m), which is defined as pump manual force Pw = 0.163 * Q * H [kw], and pump axial force Ps = manual force / KS pump B efficiency [kw] is defined, and the motor output = pump shaft power (1 + free rate) / transmission efficiency [kw].

여기서 여유율은 22~55kw이하 일 경우는 0.15, 55kw 이상일 경우는 0.1이 되고, 전달효율(커프링 직결)은 1.0, 모터출력=계측전력값*모터 효율이 되며, 펌프 축동력=모터출력/(1+여유율)이 된다.In this case, the margin ratio is 0.15 for 22 ~ 55kw or less, and 0.1 for 55kw or more, and the transmission efficiency (direct coupling) is 1.0, motor output = measurement power value * motor efficiency, and pump shaft power = motor output / (1 + Free rate).

따라서 펌프효율=(0.163*Q*H)(1+여유율)/모터출력 이 된다.Therefore, pump efficiency = (0.163 * Q * H) (1 + margin) / motor output.

펌프효율을 결정하는 유량과 양정 및 모터출력은 모터 회전수와의 관계는The flow rate and head and motor output that determine the pump efficiency are related to the motor speed.

Q∝f(N), H∝f2(N2), P∝f3(N3)가 되며, 현재 가변속 으로 펌프를 가동할 경우에 일정 주파수를 선택하여 제어만 하고 있다.Q∝f (N), H∝f 2 (N 2 ), and P∝f 3 (N 3 ). Currently, only a certain frequency is selected and controlled to operate the pump at variable speed.

따라서 펌프의 운전시 효율적인 운전에 의안 에너지 절감 은 무시하고, 주파수 변화의 값만 가지고 펌프를 운전하고 있어, 효율이 최대인 상태로 펌프를 운전하지 못하게 되므로, 에너지 절감을 달성하기에는 어려움이 있는 것이었다.Therefore, it is difficult to achieve energy saving because the pump is operated only with the value of frequency change, ignoring the energy saving while ignoring the energy saving while operating the pump.

즉 모터의 주파수를 가변시켜 펌프의 회전수를 제어함에 있어서, 기존에는 미리 정해놓은 펌프 효율을 낼 수 있는 가변 주파수를 설정하여 운전하게 되므로, 펌프의 실제 작동에 의한 효율이 최대로 나타나지 않는 주파수로 운전하는 경우가 많게 되어 실질적인 에너지 절감을 기대할 수 없는 것이었다.In other words, in controlling the rotational speed of the pump by varying the frequency of the motor, a variable frequency capable of producing a predetermined pump efficiency is set and operated. Therefore, the efficiency of the pump is not maximized. In many cases, it was impossible to expect substantial energy savings.

본 발명은 모터펌프의 기동시 주파수를 단계적으로 변화시킬 경우 펌프의 회전수가 가변되게 되고, 펌프의 회전수에 따라 유량과 전력량 및 수두가 변하게 되므로, 유량값이 안정을 취한 후 최대 효율을 나타내는 주파수를 찾아 운전이 이루어지게 하므로서 펌프를 최대 효율에서 운전할 수 있도록 하는 것이다.According to the present invention, when the frequency of the motor pump is changed in steps, the rotation speed of the pump is changed, and the flow rate, power amount, and head are changed according to the rotation speed of the pump. By finding and operating the pump, the pump can be operated at maximum efficiency.

이러한 본 발명은 펌프의 기동시 기본 주파수에서 상한 주파수까지 1Hz 단위로 주파수를 변화시켜 가며 펌프를 운전시키도록 하되 주파수 변화 후 3분간 안정시간을 갖게 하고, 3분의 안정시간이 경과되면 5분간의 데이터를 3초 간격으로 입력데이터를 취득 연산하여 변화를 연산하여 효율을 산출 한 후 저장하며, 1주기 연산 후 최대효율 값을 읽어내어 그 때의 주파수로 펌프를 운전시키도록 하므로서 이루어지는 것으로 최대 효율을 나타낼 수 있는 주파수로 펌프를 운전하게 되어 에너지를 절감할 수 있게 된다.The present invention is to operate the pump by changing the frequency in the unit of 1Hz from the fundamental frequency to the upper limit frequency at the start of the pump to have a settling time for 3 minutes after the frequency change, when the settling time of 3 minutes has elapsed It is made by acquiring the input data every 3 seconds and calculating the change to calculate the efficiency and then saving it.After reading the maximum efficiency value after 1 cycle operation, the pump is operated at the frequency. Operating the pump at a frequency that can be represented will save energy.

본 발명은 펌프(P)를 최대 효율로 운전할 수 있는 주파수를 찾아낸 후 그 주파수로 펌프모터가 운전되게 하여 최대 효율을 낼 수 있도록 하는 것으로, 도 1과 같은 구성도를 갖추며, 도 2와 같은 흐름도에 의거 최대 효율의 주파수를 찾아 펌프(P)를 가동 운전하는 것이다.The present invention is to find a frequency that can operate the pump (P) at the maximum efficiency, and to operate the pump motor at that frequency to achieve the maximum efficiency, has the configuration as shown in Figure 1, the flow chart as shown in FIG. According to the operation, the pump P is operated by finding the frequency of maximum efficiency.

본 발명은 프로그래머블 로직 콘트롤러(12)의 중앙처리장치(b)에서 전압주파수 변환기(1)의 출력이 인가되는 자동전환 스위치(3)이 A의 위치인 경우 정속 운전 이 되고 B의 우치일경우에는 (P)를 구동시키는 모터의 속도를 변화시키도록 한다.According to the present invention, when the automatic switching switch 3 to which the output of the voltage-frequency converter 1 is applied in the central processing unit b of the programmable logic controller 12 is in the A position, the constant speed operation is performed. Change the speed of the motor that drives (P).

상기 전압주파수 변환기(1)와 전력수집기(2)의 출력은 프로그래머블 로직 콘트롤러(12)의 통신포트(c)에 연결되어 전송되는 한편 프로그래머블 로직 콘트롤러(12)의 중앙처리장치(b)에 의한 제어를 받게 된다. The outputs of the voltage-frequency converter 1 and the power collector 2 are connected to the communication port c of the programmable logic controller 12 and transmitted while being controlled by the central processing unit b of the programmable logic controller 12. Will receive.

펌프(P)는 위치차가 있는 물을 펌핑하여 이동시키게 되는 것으로, 프로그래머블 로직 콘트롤러(12)의 중앙처리장치(b)가 펌프(P)를 최대 효율로 구동될 수 있도록 한다.The pump P pumps and moves water having a difference in position, and allows the central processing unit b of the programmable logic controller 12 to drive the pump P at maximum efficiency.

본 발명의 전력수집기(2)에는 계기용 변압기(6)와 계기용 변류기(7)가 연결되는 한편 프로그래머블 로직 콘트롤러(12)의 통신포트(c)와 통신이 이루어지게 하고, 전압주파수 변환기(1)도 프로그래머블 로직 콘트롤러(12)의 통신포트(c)와 통신이 이루어지게 하는 한편 프로그래머블 로직 콘트롤러(12)의 중앙처리장치(b)에서 자동전환 스위치(3)를 제어할 수 있도록 하며, 자동전환 스위치(A)에는 진공 전자 접촉기 또는 전자석 접촉기(4-5)를 통하여 전원이 공급될 수 있도록 한다.The power collector 2 of the present invention is connected to the instrument transformer (6) and the instrument current transformer (7) while communicating with the communication port (c) of the programmable logic controller 12, the voltage frequency converter (1) ) Also allows communication with the communication port (c) of the programmable logic controller (12) while allowing the central processing unit (b) of the programmable logic controller (12) to control the automatic switching switch (3), and automatic switching. The switch A allows power to be supplied through the vacuum magnetic contactor or the electromagnetic contactor 4-5.

상기 펌프(P)에는 양측으로 압력신호 변환기(8)를 설치하는 한편 유량을 체크하는 유량계(10)를 설치하고, 수위검출 신호 변환기(9)를 이용하여 수위를 검출할 수 있도록 한다.The pump P is provided with a pressure signal transducer 8 on both sides, a flow meter 10 for checking the flow rate, and the water level can be detected using the water level detection signal transducer 9.

상기 압력신호 변환기(8)와 유량계(10) 및 수위검출 신호변환기(9)는 모두 프로그래머블 로직 콘트롤러(12)의 입출력 단자와 연결시킨다.The pressure signal converter 8, the flow meter 10, and the water level detection signal converter 9 are all connected to the input / output terminals of the programmable logic controller 12.

프로그래머블 로직 콘트롤러(12)는 중앙처리장치(b)에서 터치스크린 방식인 제어 및 감시기(11)로 부터의 명령을 받아 최대 효율 운전 주파수를 찾게 되는 것 으로, 터치스크린 방식의 제어 및 감시기(11)는 현재 펌프(P) 운전상태를 확인할 수 있도록 표시시키는 한편 터치스크린 방식으로 펌프(P)의 효율을 제어하는 명령을 내리도록 하며, 상기 명령에 의해 중앙처리장치(b)에서 최대효율을 내는 주파수를 찾아 펌프(P)를 운전하고 수집된 데이터를 상태 및 그래프로 표시 한다.The programmable logic controller 12 receives a command from the control and monitor 11, which is a touch screen, in the central processing unit b, and finds the maximum efficiency driving frequency. The control and monitor 11 of the touch screen method is used. Indicates the current state of the operation of the pump (P) while giving a command to control the efficiency of the pump (P) by the touch screen method, the frequency of the maximum efficiency in the central processing unit (b) by the command Find and operate pump (P) and display collected data as status and graph.

본 발명의 프로그래머블 로직 콘트롤러(12)의 중앙처리장치(b)는 제어 및 감시기(11)의 명령을 받아 최대 효율의 주파수를 찾아 운전하도록 하는 것으로, 유량의 최저점을 나타내는 기준주파수에서 최대 유량점을 나타내는 상한주파수까지 1Hz 단위로 주파수를 증가시켜 운전이 이루어지게 하고, 운전주파수가 변화되면 3분의 안정시간이 경과시켜 입력데이터를 안정화시킨 후 5분 동안 3초 간격으로 입력데이터를 취득 연산하여 효율을 산출하고, 산출된 효율은 기준주파수에서 상한주파수까지 저장한 후 저장된 데이터를 비교하여 최적 효율 점 주파수를 찾아내어 운전주파수로 설정하게 된다.The central processing unit (b) of the programmable logic controller 12 of the present invention is to receive the command of the control and monitor 11 to find and operate the frequency of maximum efficiency, and to set the maximum flow rate at the reference frequency representing the lowest point of the flow. Operation is performed by increasing the frequency in 1Hz unit up to the upper limit frequency indicated.When the operation frequency is changed, the stability time of 3 minutes elapses and the input data is stabilized. After calculating the efficiency, the calculated efficiency is stored from the reference frequency to the upper limit frequency, and compared with the stored data to find the optimum efficiency point frequency is set to the operating frequency.

이러한 구성의 본 발명에서 펌프의 최대요율 운전 제어장치는 도 1에 도시된 바와 같이 제어 및 감시기(11)에서의 입력에 의해 프로그래머블 로직 콘트롤러(12)의 중앙처리장치(b)에서 전압주파수변환기(1)를 제어하여 펌프(P)를 운전시키도록 하되 최대 효율을 나타내는 주파수를 찾아 운전주파수로 설정하여 운전시키는 것이다.In the present invention of such a configuration, the maximum rate operation control device of the pump is a voltage-frequency converter (B) in the central processing unit (b) of the programmable logic controller 12 by an input from the control and monitor 11 as shown in FIG. 1) to control the pump (P) to operate, but to find the frequency that represents the maximum efficiency is set to the operating frequency to operate.

중앙처리장치(b)에서 최대효율 주파수를 찾기 위해서는 기준주파수에서 상한 주파수까지 1Hz 단위로 주파수를 변경시켜가며 운전이 이루어지게 하고, 변화 운전 주파수로 운전될 때 전력수집기(2)와 전압주파수변환기(1) 및 수위검출 신호변환기(9)와 유량계(10) 및 압력신호 변환기(8)의 입력을 중앙처리장치(b)로 통신하여 입력시킴으로서 주파수 변환에 따른 운전효율을 찾아낼 수 있도록 한다.In order to find the maximum efficiency frequency in the central processing unit (b), the operation is performed by changing the frequency in the unit of 1Hz from the reference frequency to the upper limit frequency, and the power collector 2 and the voltage frequency converter 1) and the input of the level detection signal converter 9, the flow meter 10 and the pressure signal converter 8 is communicated to the central processing unit (b) to input the operation efficiency according to the frequency conversion.

즉 운전주파수를 변경시켜가며 변환된 운전주파수 운전할 때의 효율을 연산하여 저장시킨 후 상한주파수까지 변환이 완료되면 저장된 효율 중 최대 효율을 나타내는 주파수를 선택하여 운전주파수로 사용하므로서 최대 효율로 펌프(P)를 운전시키게 되고, 이로 인하여 에너지를 절감시킬 수 있게 된다.That is, after changing the operating frequency, the efficiency of operating the converted operating frequency is calculated and stored.When the conversion is completed up to the upper limit frequency, the frequency representing the maximum efficiency among the stored efficiencies is selected and used as the operating frequency. ), Which saves energy.

본 발명에서 중앙처리장치(b)의 최대 효율 주파수를 찾아내는 과정은 도 2를 참고로 하여 설명한다.The process of finding the maximum efficiency frequency of the central processing unit (b) in the present invention will be described with reference to FIG.

중앙처리장치(b)에서는 제어 및 감시기(11)의 10키 입력에 의해 최대효율 주파수를 찾는 과정을 실행하게 되며, 전력수집기(2)와 전압주파수변환기(1) 및 수위검출 신호변환기(9)와 유량계(10) 및 압력신호 변환기(8)의 출력신호를 입력받게 되는 한편 운전주파수를 변경시켜가며 운전을 하고 운전주파수 변환시의 효율을 비교하여 최대 효율을 보이는 주파수로 펌프(P)를 운전시키는 것이다.The central processing unit (b) executes a process of finding the maximum efficiency frequency by the 10-key input of the control and monitoring unit (11), the power collector (2), the voltage frequency converter (1) and the water level detection signal converter (9). And the output signals of the flowmeter 10 and the pressure signal converter 8 are input, and the operating frequency is changed and the pump P is operated at a frequency showing the maximum efficiency by comparing the efficiency when converting the operating frequency. will be.

중앙처리장치(b)는 유량의 최저점을 설정하거나 해제토록 하고, 유량의 최저점에서의 주파수를 기준주파수로 하여 상한 주파수까지 1Hz 단위로 운전주파수를 증가시키도록 하고, 변화된 운전주파수가 상한 주파수를 넘으면 작동을 중단시킨다.(상한주파수는 펌프최대유량 또는 펌프정격전류 등 택일)The central processing unit (b) sets or releases the lowest point of the flow rate, increases the operating frequency in units of 1 Hz up to the upper limit frequency using the frequency at the lowest point of the flow rate as a reference frequency, and when the changed operating frequency exceeds the upper limit frequency. Stop operation (upper frequency is alternative to pump maximum flow rate or pump rated current)

운전주파수를 1Hz 단위로 증가시키면 전력과 유량값 등의 안정을 확인하여야 하고, 이때 입력신호의 안정을 위하여 3분의 안정시간을 유지하며, 3분의 안정시간 이 경과하면 5분 동안 3초 간격으로 입력데이터를 취득하도록 하고, 5분이 경과하면 운전주파수를 1Hz 증가시켜 다시 입력데이터 취득과정을 되풀이 하도록 한다.If the operating frequency is increased by 1Hz, the stability of power and flow rate should be checked. At this time, the stability time of the input signal is maintained for 3 minutes, and after 3 minutes of stability time, the interval is 3 seconds for 5 minutes. After 5 minutes, the input frequency is increased by 1Hz and the input data acquisition process is repeated again.

위와 같이 3분간의 안정시간 후 5분간 3초 간격으로 취득한 데이터는 중앙처리장치(b)에서 별도의 저장공간에 저장시키는 한편 취득 데이터를 분석하여 운전효율을 연산하여 저장하도록 한다.After the three-minute settling time as described above, the data acquired at three-second intervals for five minutes is stored in a separate storage space in the central processing unit (b) while analyzing the acquired data to calculate and store operating efficiency.

운전주파수가 상한주파수가 될 때까지 상기 과정을 수행한 후에는 저장된 운전효율 중 최대효율을 나타내는 운전주파수를 찾아낼 수 있으며, 이와 같이 찾아낸 운전주파수로 펌프(P)를 운전하면 최대효율로 펌프(P)를 운전할 수 있게 된다.After performing the above process until the operating frequency becomes the upper limit frequency, it is possible to find the operating frequency indicating the maximum efficiency among the stored operating efficiencies. P) can be operated.

이와 같이 최대 효율점을 찾는 과정은 일정한 간격을 두고 반복적으로 실행할 수도 있고 사용자가 명령을 내려 임의로 실행할 수도 있다.As such, the process of finding the maximum efficiency point may be repeatedly executed at regular intervals or may be arbitrarily executed by a user.

본 발명은 펌프가 여러 개 일 경우 펌프의 운전시간을 평균화하기 위하여 전호기를 대상으로 순차적으로 운전할 수 있도록 하고, 정전 후 전원이 복귀된 경우는 정전되기 이전의 상태로 펌프를 운전할 수 있도록 하여 펌프의 동시가동을 방지하도록 하며, 운전 중 고장이 발생한 경우는 다른 펌프를 자동으로 가동시키도록 한다.According to the present invention, when the pumps are plural, the pumps can be operated sequentially in order to average the operating time of the pumps, and when the power is restored after the power failure, the pump can be operated in the state before the power failure. The simultaneous operation of the pumps should be prevented, and if a failure occurs during operation, another pump should be started automatically.

한편 본 발명은 감시 및 제어기(11)에서 운전 상태를 감시할 수 있도록 하는 한편 터치 스크린을 이용하여 제어를 하게 되며, 상기 감시 및 제어기(11)와 프로그래머블 로직 콘트롤러(12)는 통신으로 데이터를 일치시도록 하고, 프로그래머블 로직 콘트롤러(12)의 내부 메모리에 저장된 데이터는 외부에서 취득 할 수 있도록 하여 데이터 분석이 가능토록 한다.Meanwhile, the present invention enables the monitoring and monitoring of the operation state in the controller 11 and the control using the touch screen. The monitoring and the controller 11 and the programmable logic controller 12 correspond to data by communication. The data stored in the internal memory of the programmable logic controller 12 can be externally acquired to enable data analysis.

본 발명은 모터펌프의 기동시 주파수를 단계적으로 변화시킬 경우 펌프의 회전수가 가변되게 되고, 펌프의 회전수에 따라 유량과 전력량 및 수두가 변하게 되므로, 유량값 이 안정을 취한 후 최대 효율을 나타내는 주파수를 찾아 운전이 이루어지게 하므로서 펌프를 최대 효율에서 운전할 수 있도록 하므로서 에너지를 절감시킬 수 있는 것이다.According to the present invention, when the frequency of the motor pump is changed step by step, the rotation speed of the pump is changed, and the flow rate, power amount, and head change according to the rotation speed of the pump. By finding and operating, the pump can be operated at maximum efficiency, thereby saving energy.

Claims (2)

(삭제)(delete) 펌프의 운전주파수를 기준주파수(최저유량)에서 상한 주파수(최고유량)까지 1Hz 단위로 증가시켜 가며 구동시키도록 하고, 변환된 운전주파수는 3분의 안정기간을 두어 입력 데이터를 안정화시키고, 안정기간이 경과하면 5분 동안 3초 간격으로 입력 데이터를 획득하고, 획득된 데이터의 효율을 분석하여 저장하고, 운전주파수가 상한 주파수에 도달하면 저장된 효율을 비교하여 최대 효율을 갖는 주파수를 운전주파수로 설정하여 운전이 이루어지게 하는 것을 특징으로 하는 펌프의 최대 효율 운전 방법.The driving frequency of the pump is increased in 1Hz increments from the reference frequency (lowest flow rate) to the upper limit frequency (highest flow rate), and the converted operating frequency has a 3-minute settling period to stabilize the input data. After this, the input data is acquired at intervals of 3 seconds for 5 minutes, the efficiency of the obtained data is analyzed and stored, and when the operating frequency reaches the upper limit frequency, the stored efficiency is compared and the frequency having the maximum efficiency is set as the operating frequency. Maximum efficiency operation method of the pump, characterized in that the operation is made by.
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