CN100501280C - Water chilling unit control system and its control method - Google Patents
Water chilling unit control system and its control method Download PDFInfo
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- CN100501280C CN100501280C CNB2007102012234A CN200710201223A CN100501280C CN 100501280 C CN100501280 C CN 100501280C CN B2007102012234 A CNB2007102012234 A CN B2007102012234A CN 200710201223 A CN200710201223 A CN 200710201223A CN 100501280 C CN100501280 C CN 100501280C
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- discharge switch
- control system
- control method
- detect
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to the central air-conditioning control system, in particular involving the detection of the modular cold unit water flow switch and its control method. The invention discloses a control system of DC signal detect the water flow and its control method. The technology program is, the cold unit control system includes the MCU and water flow detection circuit, and its characteristics are that the DC output signal of water flow detection circuit connects the MCU. Based on the closed signal of the water flow detection switch and the work condition of the pump, the invention method judges whether the circulating water system fault, or water flow switch fault. The beneficial effects of the invention is that reduced the complexity and cost structure of the control system, can provided the accurate fault information of the circulating water system to the control system, reduced the loss of the manmade downtime, improved the reliability of the system.
Description
Technical field
The present invention relates to central air conditioning system, particularly the detection and the control method of modular water chilling unit group discharge switch.
Background technology
Existing modular water chilling unit group, control system generally comprise MCU (microprocessor) and discharge testing circuit.Whether normal in order to detect circulation work, most employing detects the disconnection of discharge switch by alternating current or closure signal realizes start, protects or shuts down, thereby reaches the purpose of control or protection system.The discharge switching signal needs to adopt power resistor to carry out current limliting in transmission course, needs the coupling shaping circuit to carry out the signal level shaping.The control system of prior art, discharge testing circuit complex structure not only, and since the transmission be AC signal, be easy to generate induced electromotive force in the transmission course, cause discharge switch false retrieval and erroneous judgement, particularly for the multicomputer centralized control system, because signal transmission wire is long, and, more be easy to generate mistake through twining.
The control method of prior art is, after system's unit was opened, before compressor was opened, main frame output water pump control signal was opened water pump, judged then whether the discharge switch is closed, if closed, then the compressor of each unit is opened and freezed or heat; If the discharge switch is not closed, then think system's lack of water, can not open compressor.Disconnect if after compressor is opened, the discharge switch occurs, then report fault after the close compressor, could open unit after re-powering after whole system must be repaired.This control method can not be distinguished the circulation fault (stifled, dirty stifled etc. as lack of water, ice) or the fault of discharge switch itself, needs to carry out artificial forced shutdown and start without exception.
Summary of the invention
Technical problem to be solved by this invention just provides and a kind ofly adopts direct current signal to detect the control system of discharge and improve its control method.
The present invention solve the technical problem, and the technical scheme of employing is,
Water chilling unit control method may further comprise the steps:
A. whether before starting mode of pump, it is closed to detect the discharge switch, if, ingoing stream amount switch abnormal protection program then, whole system can't be started shooting; Otherwise enter following step;
B. after starting water pump t1 minute,, then switch off the pump earlier if in t2 minute, detect less than the discharge switch closure signals, after starting water pump t1 minute once more, if detected less than the discharge switch closure signals in t2 minute continuously again, cut off the electricity supply ingoing stream amount abnormal protection program immediately;
C. normal operation period, if t does not detect the discharge switch closure signals second continuously, shutdown system immediately then, ingoing stream amount abnormal protection program.
Further, after the ingoing stream amount abnormal protection program, control system is sent prompting.
Further, after the ingoing stream amount abnormal protection program, system can not recover voluntarily; Have only by after repairing, re-power start and just can resume operation.
The invention has the beneficial effects as follows, the accurate fault message of circulation can be provided control system, reduced and thought the loss of shutting down, improved the reliability of system.
Description of drawings
Fig. 1 is the discharge testing circuit schematic diagram of embodiment;
Fig. 2 is the water chilling unit system structural representation.
The specific embodiment
Describe technical scheme of the present invention in detail below in conjunction with drawings and Examples.
The present invention adopts dc current signal transmission detection signal, according to the DC current characteristic, can cancel waveform shaping circuit, can reduce cost, improves reliability.By controlling after the detection to the discharge switch, after powering on, do not start water pump before, if to detect the discharge switch be closure signal, then report the discharge switch unusual, system can not start shooting; If behind the starting mode of pump, detect the discharge switch for disconnecting, then switch off the pump earlier, start water pump after 3 minutes again, if detect the discharge switch, then report discharge unusual still for disconnecting; Must could start shooting again through repairing the back system.Can judge automatically that so the fault of discharge switch own still is system's excessive low water level protection.
Embodiment
This routine control system comprises MCU and discharge testing circuit, as shown in Figure 1.The discharge testing circuit is by+20V power supply, photoelectrical coupler D1, and resistance R 1, R2, capacitor C 1, discharge switch SW 1 is formed.The circuit working principle is as follows:
When discharge switch SW 1 disconnected, flowing through the electric current that 1,2 pin of resistance R 1, photoelectrical coupler D1 flow through was 0, and 3,4 pin of photoelectrical coupler D1 end, and are in off-state, the SW input of MCU pulled on the resistance R 2 high level (+5V).Capacitor C 1 has filter action, makes the level signal that enters MCU clean and noiseless, and resistance R 1 has metering function.When discharge switch SW 1 was connected, the electric current that flows through 1,2 pin of resistance R 1 and photoelectrical coupler D1 was about 4mA, 3, the 4 pin saturation conductions of photoelectrical coupler D1, and the SW input of MCU is changed to low level.The existing buffer action of photoelectrical coupler D1 also has the level conversion effect concurrently, and the 20V dc level signal is converted to the 5V dc level signal.
Like this, no matter how long lead from discharge switch SW 1 to photoelectrical coupler D1 has, also no matter the whether winding of lead can not produce because the detection mistake that lead length and canoe cause has improved the reliability that detects widely.
System control method is as follows:
System architecture is referring to Fig. 2, and Fig. 2 is the system that N platform unit is formed.1 is main frame among the figure; 2 is water pump; 3 is discharge switch 1; 4 is discharge switch N; 5 is control system.
At first, before water pump 2 starts, if detect discharge switch 3,4 closures, then ingoing stream amount switch abnormal protection program.Explanation is not before water pump 2 starts, and promptly chilled water does not flow, and discharge switch 3,4 should disconnect, if closed, it is unusual to illustrate that then discharge switch 3,4 occurs itself, rather than excessive low water level protection, and whole system can not be started shooting.
Second step; in water pump 2 starts back 3 minutes; if detected signal in continuous 1 minute less than discharge switch 3,4 closures; then switch off the pump 2 earlier; restart water pump 2 then; if detected the signal less than discharge switch 3,4 closures, ingoing stream amount abnormal protection program immediately in continuous again 1 minute.Lack of water in the water system is described, perhaps water system has obstruction.
In the 3rd step, after starting mode of pump 2 moves 3 minutes, do not detect discharge switch 3,4 closure signal, then first Shutdown Hosts 1 and water pump 2, ingoing stream amount abnormal protection program as continuous 10 seconds.The fault of water system own is described.
The 4th step, under second and third step situation, the glittering indication fault of the malfunction indicator lamp of control system 5 position, and close compressor, blower fan and water pump 2.
In the 5th step, after the discharge abnormal protection occurred 2 times, system can not recover automatically, had only by after repairing, and re-powered start and could recover normal operation.
Above-mentioned time parameter can be set as pump capacity, pipe condition etc. according to concrete systematic parameter, reduces erroneous judgement as far as possible.
Control method of the present invention; not only can solve because the system failure that the fault of discharge switch itself causes; can solve again and cause chilled water in a few minutes, can't finish circulation wrong report failure problems under the situation such as water system lack of water; having avoided the people is the drawback of carrying out startup and shutdown, fault has only taken place completely just can report the discharge abnormal protection.For multicomputer water system in parallel, coordinate the operation of other units by Centralized Controller 5.
Claims (3)
1. water chilling unit control method may further comprise the steps:
A. whether before starting mode of pump, it is closed to detect the discharge switch, if, ingoing stream amount switch abnormal protection program then, system can not start shooting; Otherwise enter following step;
B. start water pump, after a few minutes, if detect within a certain period of time less than the discharge switch closure signals, then switch off the pump earlier, start water pump once more after a few minutes, if still detect less than the discharge switch closure signals, cut off the electricity supply ingoing stream amount abnormal protection program immediately;
C. normal operation period, if continuous several seconds kinds do not detect the discharge switch closure signals, shutdown system immediately then, ingoing stream amount abnormal protection program.
2. water chilling unit control method according to claim 1 is characterized in that, after the ingoing stream amount abnormal protection program, control system is sent alarm signal.
3. water chilling unit control method according to claim 1 is characterized in that, after the ingoing stream amount abnormal protection program, system can not recover voluntarily; Have only by after repairing, re-power start and just can resume operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007102012234A CN100501280C (en) | 2007-07-31 | 2007-07-31 | Water chilling unit control system and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007102012234A CN100501280C (en) | 2007-07-31 | 2007-07-31 | Water chilling unit control system and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101101164A CN101101164A (en) | 2008-01-09 |
| CN100501280C true CN100501280C (en) | 2009-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007102012234A Expired - Fee Related CN100501280C (en) | 2007-07-31 | 2007-07-31 | Water chilling unit control system and its control method |
Country Status (1)
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| CN (1) | CN100501280C (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854227B (en) * | 2011-07-01 | 2014-12-24 | 珠海格力电器股份有限公司 | Detecting device and detecting method of target-type fluid |
| CN102721155A (en) * | 2012-06-28 | 2012-10-10 | 中国扬子集团滁州扬子空调器有限公司 | Control device and control method for rapidly detecting abnormality of commercial air conditioning water system and protecting commercial air conditioning water system |
| CN104566776B (en) * | 2013-10-28 | 2017-12-12 | 珠海格力电器股份有限公司 | Control method, control device and the water-cooling type air-conditioner set of water-cooling type air-conditioner set |
| CN104896650B (en) * | 2014-03-05 | 2017-08-29 | 珠海格力电器股份有限公司 | Air-conditioner water system method of controlling exhaust gas, device and air-conditioning system |
| JP6342727B2 (en) * | 2014-06-24 | 2018-06-13 | ヤンマー株式会社 | Heat pump chiller |
| CN105067252B (en) * | 2015-08-23 | 2017-11-03 | 北京工业大学 | A kind of handpiece Water Chilling Units fault detection method based on improved FastICA |
| CN105823120A (en) * | 2016-03-23 | 2016-08-03 | 广东美的暖通设备有限公司 | Fault judging and handling method and system for target current switch of water system |
| CN106483847B (en) * | 2016-09-20 | 2019-06-14 | 北京工业大学 | A kind of water cooler fault detection method based on adaptive ICA |
| CN106705253A (en) * | 2016-12-27 | 2017-05-24 | 珠海格力电器股份有限公司 | Air-conditioning household type unit |
| CN110955201B (en) * | 2019-11-01 | 2022-10-28 | 河南中烟工业有限责任公司 | System for automatic detection operation of soft water supply system and control method |
| CN111006358A (en) * | 2019-12-23 | 2020-04-14 | 四川虹美智能科技有限公司 | Fault detection method based on water flow switch and outdoor unit |
| KR20210121850A (en) * | 2020-03-31 | 2021-10-08 | 엘지전자 주식회사 | Heat pump and method thereof |
| CN115388559B (en) * | 2022-09-05 | 2023-02-24 | 宁波奥克斯电气股份有限公司 | Flow abnormity determination method and device and air energy hot water system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6276152B1 (en) * | 1999-02-05 | 2001-08-21 | American Standard International Inc. | Chiller capacity control with variable chilled water flow compensation |
| CN1654893A (en) * | 2005-01-28 | 2005-08-17 | 杨东 | Energy-saving intelligent control system for central air conditioner |
| CN1991400A (en) * | 2005-12-30 | 2007-07-04 | 上海御能动力科技有限公司 | Dynamometer machine monitoring system having control and data acquisition function |
-
2007
- 2007-07-31 CN CNB2007102012234A patent/CN100501280C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6276152B1 (en) * | 1999-02-05 | 2001-08-21 | American Standard International Inc. | Chiller capacity control with variable chilled water flow compensation |
| CN1654893A (en) * | 2005-01-28 | 2005-08-17 | 杨东 | Energy-saving intelligent control system for central air conditioner |
| CN1991400A (en) * | 2005-12-30 | 2007-07-04 | 上海御能动力科技有限公司 | Dynamometer machine monitoring system having control and data acquisition function |
Also Published As
| Publication number | Publication date |
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| CN101101164A (en) | 2008-01-09 |
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Owner name: SICHUAN CHANGHONG ELECTRIC CO.,LTD. Free format text: FORMER OWNER: SICHUAN CHANGHONG ELECTRIC APPLIANCE CO., LTD. Effective date: 20090724 |
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Effective date of registration: 20090724 Address after: No. 35, Mian Xing East Road, hi tech Zone, Sichuan, Mianyang Patentee after: Sichuan Changhong Air-Coditioning Co., Ltd. Address before: No. 35, Mian Xing East Road, hi tech Zone, Sichuan, Mianyang Patentee before: Sichuan Changhong Electrical Appliance Co., Ltd. |
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