CN104991510A - One-in-service-one-standby water pump variable frequency electric control system and control method - Google Patents
One-in-service-one-standby water pump variable frequency electric control system and control method Download PDFInfo
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- CN104991510A CN104991510A CN201510425354.5A CN201510425354A CN104991510A CN 104991510 A CN104991510 A CN 104991510A CN 201510425354 A CN201510425354 A CN 201510425354A CN 104991510 A CN104991510 A CN 104991510A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/058—Safety, monitoring
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- Automation & Control Theory (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a one-in-service-one-standby water pump variable frequency electric control system and a control method. A field alternating current power supply is connected to a PLC power supply successively through a breaker, a phase sequence relay and a fuse link; a PLC collects linkage signals, water flow switch signals and low temperature protection signals; a 0-24V pressure sensor, a temperature sensor and the PLC control signal input to a frequency converter; the field alternating current power supply is connected to the frequency converter through the breaker and the frequency converter outputs driving signals to two water pumps to control the water pumps to work. The operation of the water pumps is automatically controlled by adopting a one-in-service-one-standby mode, automatic change-over under the condition of fault and alternate operation, using the PID operation, collecting the real-time pressure difference or temperature difference signals, enabling the frequency controller to adjust the output frequency and controlling the rotating speeds of the water pumps. The control is powerful and highly-targeted. The system is suitable for both special models and projects and equipment requiring the control combination function.
Description
Technical field
The present invention relates to a kind of air conditioner controlling technology, particularly a kind of the using and the reserved pump variable frequency electric-control system and control method.
Background technology
In existing air-conditioning system, the parallel connection of two water pumps uses, failover and frequency conversion control functions can not combine cover and join, and market lacks the standby electricity Ore-controlling Role in parallel of water pump selection modular product, as energy-saving type air conditioner machine room, module type air conditioner room equipment and hydraulic module do not have the Special electric Ore-controlling Role of for subsequent use and frequency conversion of special parallel connection.The combination application technique of water pump cannot be popularized, and the control of water pump uses the nonstandard manufacture of whole non-standard de-sign, and project cost is improved, claim for eot, Energy Saving Control cannot unified standard.
It is more that one of existing close product becomes two fixed configuration mode advantages, also more flexible in operation, but be no matter excision or drop into variable frequency pump time, all must ensure that the flow of at this moment variable frequency pump equals zero, its lift equals system differential pressure just simultaneously.If it is improper that the switching time of variable frequency pump is selected, then in variable frequency pump excision with when dropping into, or cause flow rate fluctuation, or cause control hysteresis.This just needs to determine under what supply frequency, and variable frequency pump meets this two conditions just.Shortcoming needs to consider the switching problem between variable frequency pump and constant speed pump, steering logic more complicated.
Generally, water pump parallel connection uses, the combination of failover and frequency conversion control function, be one very conventional, and possessing the control mode of energy-saving benefit, if can not make it combine and possess universal standardization, is an obstruction to the development of industry.
Summary of the invention
The present invention be directed to two the water pump parallel connections of present energy-saving frequency conversion air conditioner and use control Problems existing, propose a kind of the using and the reserved pump variable frequency electric-control system and control method, the fault automatic switchover of use the using and the reserved and in turn operation function, use PID arithmetic, gather real-time pressure reduction or temperature signal, control frequency converter regulation output frequency, control pump rotary speed, reach the object that automatically controlled water pump runs.Control very powerful, with strong points, except being applicable to special-purpose model, also can be used for the project and the equipment that need this control combination function.
Technical scheme of the present invention is: a kind of the using and the reserved pump variable frequency electric-control system, comprise PLC, frequency converter, isolating switch, A.C. contactor, phase sequence relay, fuse-link, 0-24V pressure transducer, temperature sensor, 24V direct supply, on-the-spot AC power is successively through isolating switch, phase sequence relay, fuse-link connects PLC power supply, PLC collection interlock signal, water flow switch signal and low-temperature protection signal, 0-24V pressure transducer, temperature sensor, PLC control signal input converter, on-the-spot AC power connects frequency converter through isolating switch, frequency converter output drive signal is to two water pumps, control pump working.
The control method of the using and the reserved pump variable frequency electric-control system, bring into operation, first First pump variable frequency runs, when can not meet actual needs, First water pump automatically switches to power frequency operation state, second water pump drops into converting operation automatically, and when still not satisfying the demand, second water pump also automatically switches to power frequency operation; When actual used water amount reduces, First water pump enters converting operation; When water consumption continues to reduce, First water pump is out of service, when second water pump isolated operation, and when water consumption is little, automatically switches to the pump variable frequency running status under Stress control.
Described two water pumps automatically switch in a case where: when under a water pump long-play state, automatically enter two water pump cycle alternations and run, and avoid the long-term of stand-by pump not run and corrosion, when ensureing that fire alarm occurs, water pump can put into operation smoothly; When a water pump isolated operation, when there is phase shortage, short circuit, ground connection, under-voltage, overcurrent, overvoltage, overheated, overload, start another pump and put into operation, stop fault pump operation, and report to the police.
Described PLC connects man-machine interface, and when debugging and keep in repair, system enters Non-follow control state.
Beneficial effect of the present invention is: the using and the reserved pump variable frequency electric-control system of the present invention and control method, and the combination application technique of water pump can large area be popularized, and it is standardization manufacture that the control of water pump uses, and project cost is reduced, and the duration shortens.Water pump parallel connection uses, the combination of failover and frequency conversion control function, and the control mode possess energy-saving benefit, extending water pump serviceable life, combines and stroke standard product, have great facilitation to the development of industry.
Accompanying drawing explanation
Fig. 1 is the using and the reserved pump variable frequency electric-control system electrical schematic diagram of the present invention.
Fig. 2 is present system steering logic block diagram.
Embodiment
The using and the reserved pump variable frequency electric-control system electrical principle as shown in Figure 1, comprises the control elements such as PLC, frequency converter, isolating switch, thermal overload relay, A.C. contactor, phase sequence relay, relay, fuse-link, 0-24V pressure transducer, temperature sensor, 24V direct supply and connection terminal.
By field power supply access controller, electric current, through power safety protected locations such as isolating switch, phase sequence relay, fuse-links, enters internal system, after making action command, controls pump motor, starting mode of pump by PLC, frequency converter.
Control section is then that collection pressure reduction or temperature signal enter into frequency converter inside, judges through frequency converter, makes frequency adjustment instruction, by power supply process to formulation frequency, flows to water pump, pump rotary speed is changed.
Outer link signal, water flow switch signal and low-temperature protection signal enter into PLC in addition, and the steering logic through inserting PLC in advance judges, automatically takes turns to operate to two water pumps, and the instruction that automatic fault switches exports, and coordinates water pump selection work.
System control logic block diagram as shown in Figure 2; be provided with motor (water pump) cooperative operation logic (as the using and the reserved); add the variable frequency control of motor (water pump); on this; also the Based Intelligent Control such as main frame interlock, excessive low water level protection, low-temperature protection, Stress control and temperature control are possessed; and telecommunication controls, and above-mentioned functions is integrated perfection and realizes many motors (water pump) collaborative work.
Concrete control is as follows:
1, after switch board is opened, First pump variable frequency runs, and when can not meet actual needs, this water pump automatically switches to power frequency operation, and second water pump drops into converting operation automatically, and when still not meeting, second water pump also automatically switches to power frequency operation.When actual used water amount reduces, First pump is because bring into operation at first, and this water pump is automatically out of service; When water consumption continues to reduce, second water pump is automatically out of service; When only having the large pump operation of separate unit, and when water consumption is little, automatically switch to stabilized pressure pump converting operation.When stabilized pressure pump can not meet water supply need time, then stabilized pressure pump is automatically out of service, and large pump puts into operation automatically.Pressure of supply water is stablized, and system realizes closed-loop control, the difference of energy varitrol pressure and set pressure, makes system pressure keep constant.
2, timing automatic switches: when (this time can free setting) after water pump operation certain hour, then automatically switch to next pump working, avoid long-time running loss, also avoid not working rust for a long time extremely, two pumps alternate run capable of circulation, the average operation time of balanced each pump extends the serviceable life of water pump, thus avoids the long-term of stand-by pump not run and corrosion, and when ensureing that fire alarm occurs, water pump can put into operation smoothly.
3, fault automatically switches: when a certain pump breaks down, then next pump puts into operation automatically, can not supply water by influential system.
4, Working mode set: select and manually, automatically control, manually can ensure that the safe and continuous of equipment is run, under auto state, pump motor realizes soft start, to electrical network and pipe network without impact, greatly extend the serviceable life of water pump, motor, piping system, electric control system;
5, protect: all can accurately report to the police when the faults such as phase shortage, short circuit, ground connection, under-voltage, overcurrent, overvoltage, overheated, overload appear in pump motor, water pump operation, if any fault, quits work and output of reporting to the police automatically, automatic switchover water pump;
6, fault-tolerant: switch board has automatic frequency-conversion, manual frequency conversion and manual power frequency function, can assure feed water to the full extent, even if frequency converter and programmable controller all damage, still can allow water pump power frequency operation, assure feed water.
7, adopt PLC programmable controller, carry out man-machine interface to pump group and miscellaneous equipment, be aided with computer technology and carry out Based Intelligent Control, PLC is with communication module, can realize Long-distance Control.
In order to control to meet on-the-spot situation, water pump is also configurable one standby with two, or dual-purpose one is standby, then by rational power frequency frequency conversion state switching, reaches stable hydraulic pressure and energy-conservation.
Claims (4)
1. a using and the reserved pump variable frequency electric-control system, it is characterized in that, comprise PLC, frequency converter, isolating switch, A.C. contactor, phase sequence relay, fuse-link, 0-24V pressure transducer, temperature sensor, 24V direct supply, on-the-spot AC power is successively through isolating switch, phase sequence relay, fuse-link connects PLC power supply, PLC collection interlock signal, water flow switch signal and low-temperature protection signal, 0-24V pressure transducer, temperature sensor, PLC control signal input converter, on-the-spot AC power connects frequency converter through isolating switch, frequency converter output drive signal is to two water pumps, control pump working.
2. the control method of the using and the reserved pump variable frequency electric-control system according to claim 1, it is characterized in that, bring into operation, first First pump variable frequency runs, when can not meet actual needs, First water pump automatically switches to power frequency operation state, and second water pump drops into converting operation automatically, when still not satisfying the demand, second water pump also automatically switches to power frequency operation; When actual used water amount reduces, First water pump enters converting operation; When water consumption continues to reduce, First water pump is out of service, when second water pump isolated operation, and when water consumption is little, automatically switches to the pump variable frequency running status under Stress control.
3. the control method of the using and the reserved pump variable frequency electric-control system according to claim 2, it is characterized in that, described two water pumps automatically switch in a case where:
When under a water pump long-play state, automatically enter two water pump cycle alternations and run, avoid the long-term of stand-by pump not run and corrosion, when ensureing that fire alarm occurs, water pump can put into operation smoothly;
When a water pump isolated operation, when there is phase shortage, short circuit, ground connection, under-voltage, overcurrent, overvoltage, overheated, overload, start another pump and put into operation, stop fault pump operation, and report to the police.
4. the control method of the using and the reserved pump variable frequency electric-control system according to claim 1 or 2, is characterized in that, described PLC connects man-machine interface, debug and maintenance time, system enters Non-follow control state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510425354.5A CN104991510A (en) | 2015-07-20 | 2015-07-20 | One-in-service-one-standby water pump variable frequency electric control system and control method |
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| CN201510425354.5A CN104991510A (en) | 2015-07-20 | 2015-07-20 | One-in-service-one-standby water pump variable frequency electric control system and control method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107087314A (en) * | 2016-12-29 | 2017-08-22 | 大唐湘潭发电有限责任公司 | The method that switchgear acts the frequency is reduced in a kind of regulating system of switchgear and analog machine combination |
| CN107193301A (en) * | 2017-07-26 | 2017-09-22 | 上海中车汉格船舶与海洋工程有限公司 | The energy-saving control system and method for ship sea water pump |
| CN107237369A (en) * | 2017-06-28 | 2017-10-10 | 安徽舜禹水务股份有限公司 | A kind of human-computer interaction interface system for secondary water supply system |
| CN107762818A (en) * | 2017-11-06 | 2018-03-06 | 郑州华力信息技术有限公司 | Electric power tunnel can locally and remote control double water pump switching control |
| CN109391176A (en) * | 2018-12-21 | 2019-02-26 | 荣成市固废综合处理与应用产业园有限公司 | A kind of industrial water pump motor work system |
| CN109901503A (en) * | 2019-02-18 | 2019-06-18 | 唐山不锈钢有限责任公司 | The monitoring system and method for stand-by equipment supportability |
| CN112441192A (en) * | 2020-12-12 | 2021-03-05 | 长沙中联泵业股份有限公司 | Pontoon type water taking pump station |
| CN112526868A (en) * | 2020-11-17 | 2021-03-19 | 海南蓝宇科技有限公司 | Control method of secondary pressurization domestic water supply system |
| CN112682300A (en) * | 2020-12-30 | 2021-04-20 | 上海远动科技有限公司 | Control method of variable-frequency lift pump based on liquid level regulation |
| CN112974374A (en) * | 2021-02-18 | 2021-06-18 | 天津维诺嘉华科技有限公司 | Non-intermittent high-pressure cleaning gun |
| CN113586415A (en) * | 2021-08-11 | 2021-11-02 | 青海电研科技有限责任公司 | Automatic control system and control method for redundant circulating pump of large air-cooled phase modulator |
| CN114233615A (en) * | 2022-01-06 | 2022-03-25 | 国家能源集团国源电力有限公司 | Condensate pump switching control method and device, electronic equipment and storage medium |
| CN115030888A (en) * | 2022-06-29 | 2022-09-09 | 西安热工研究院有限公司 | Adaptive control method applied to variable-frequency closed cooling water pump |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107087314B (en) * | 2016-12-29 | 2018-06-26 | 大唐湘潭发电有限责任公司 | A kind of method that the switchgear action frequency is reduced in switchgear and the regulating system of analog machine combination |
| CN107087314A (en) * | 2016-12-29 | 2017-08-22 | 大唐湘潭发电有限责任公司 | The method that switchgear acts the frequency is reduced in a kind of regulating system of switchgear and analog machine combination |
| CN107237369A (en) * | 2017-06-28 | 2017-10-10 | 安徽舜禹水务股份有限公司 | A kind of human-computer interaction interface system for secondary water supply system |
| CN107193301A (en) * | 2017-07-26 | 2017-09-22 | 上海中车汉格船舶与海洋工程有限公司 | The energy-saving control system and method for ship sea water pump |
| CN107762818A (en) * | 2017-11-06 | 2018-03-06 | 郑州华力信息技术有限公司 | Electric power tunnel can locally and remote control double water pump switching control |
| CN107762818B (en) * | 2017-11-06 | 2023-10-27 | 郑州祥和集团有限公司 | Dual-water pump switching control device capable of being controlled locally and remotely for electric power tunnel |
| CN109391176A (en) * | 2018-12-21 | 2019-02-26 | 荣成市固废综合处理与应用产业园有限公司 | A kind of industrial water pump motor work system |
| CN109901503B (en) * | 2019-02-18 | 2022-06-10 | 唐山不锈钢有限责任公司 | Monitoring system and method for guarantee capability of standby equipment |
| CN109901503A (en) * | 2019-02-18 | 2019-06-18 | 唐山不锈钢有限责任公司 | The monitoring system and method for stand-by equipment supportability |
| CN112526868A (en) * | 2020-11-17 | 2021-03-19 | 海南蓝宇科技有限公司 | Control method of secondary pressurization domestic water supply system |
| CN112441192A (en) * | 2020-12-12 | 2021-03-05 | 长沙中联泵业股份有限公司 | Pontoon type water taking pump station |
| CN112441192B (en) * | 2020-12-12 | 2024-04-26 | 长沙中联泵业股份有限公司 | Floating boat type water taking pump station |
| CN112682300A (en) * | 2020-12-30 | 2021-04-20 | 上海远动科技有限公司 | Control method of variable-frequency lift pump based on liquid level regulation |
| CN112974374A (en) * | 2021-02-18 | 2021-06-18 | 天津维诺嘉华科技有限公司 | Non-intermittent high-pressure cleaning gun |
| CN112974374B (en) * | 2021-02-18 | 2022-04-01 | 天津维诺嘉华科技有限公司 | Non-intermittent high-pressure cleaning gun |
| CN113586415A (en) * | 2021-08-11 | 2021-11-02 | 青海电研科技有限责任公司 | Automatic control system and control method for redundant circulating pump of large air-cooled phase modulator |
| CN114233615A (en) * | 2022-01-06 | 2022-03-25 | 国家能源集团国源电力有限公司 | Condensate pump switching control method and device, electronic equipment and storage medium |
| CN115030888A (en) * | 2022-06-29 | 2022-09-09 | 西安热工研究院有限公司 | Adaptive control method applied to variable-frequency closed cooling water pump |
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Application publication date: 20151021 |
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