CN203160316U - Water supply system based on programmable logic controller - Google Patents
Water supply system based on programmable logic controller Download PDFInfo
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- CN203160316U CN203160316U CN 201320125005 CN201320125005U CN203160316U CN 203160316 U CN203160316 U CN 203160316U CN 201320125005 CN201320125005 CN 201320125005 CN 201320125005 U CN201320125005 U CN 201320125005U CN 203160316 U CN203160316 U CN 203160316U
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- contactor
- water
- programmable logic
- logic controller
- water pump
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Abstract
The utility model provides a water supply system based on a programmable logic controller. At present, many companies conduct projects of water supply with constant pressure and frequency conversion in domestic, but most of the companies adopt foreign transducers to control rotating speed of water pumps, closed-loop regulation of pressure of water pipe networks, and circulation control of multiple water pumps. Comprehensive technical indicators like dynamic performance, stability performance, anti-interference performance and openness are far from meeting requirements of all users. The water supply system comprises the programmable logic controller (1) which is respectively connected with a frequency conversion system (2) and a contactor (3), the contactor is respectively connected with a water pump A (4), a water pump B (5) and a water pump C (6), the water pump A (4), the water pump B (5) and the water pump C (6) are arranged on three branch pipes respectively, and the branch pipes are connected with a water conveying pipe (7) respectively. The water conveying pipe is provided with a pressure transmitter (8) which is connected with the frequency conversion system. The water supply system is used for frequency conversion water supply.
Description
Technical field:
The utility model relates to a kind of water system based on programmable logic controller (PLC).
Background technology:
Constant pressure water supply is to grow up gradually after the development of variable-frequency control technique.In early days, since the function of the external frequency converter of producing mainly be limited to FREQUENCY CONTROL, lifting speed control system, rotating control, play braking control, play braking control, voltage-frequency than control and various defencive function.Be applied in the constant pressure water supply system, frequency converter in order to satisfy the output size requirement not simultaneously, guarantees that ductwork pressure is constant only as executing agency, and needing provides pressure controller and pressure sensor in the frequency converter outside, and pressure is carried out closed-loop control.
At present domestic have many companies doing the engineering of constant pressure water supply, but all adopt the rotating speed of external Frequency Converter Control water pump mostly, the closed-loop adjustment of water pipe ductwork pressure and the loop control of many water pumps, the employing programmable logic controller (PLC) and the corresponding software that have are achieved; The employing single-chip microcomputer and the corresponding software that have are achieved.But the many-sided comprehensive technical indexes such as dynamic property, stability, Immunity Performance and opening in system also fail to reach all users' requirement far away.
Summary of the invention:
The purpose of this utility model provides a kind of water system based on programmable logic controller (PLC), determine with the reliability height, use simple, easy to maintenance, programme flexibly that industrial control equipment frequency converter and programmable logic controller PLC design the varying speed and constant pressure feed water system as major control equipment, the assurance whole system is reliable, energy-saving safe obtains best operating condition.
Above-mentioned purpose realizes by following technical scheme:
Water system based on programmable logic controller (PLC), its composition comprises: programmable logic controller (PLC), described programmable logic controller (PLC) is connected with frequency conversion system, contactor respectively, described contactor respectively with three shunt conduit are installed on water pump A, water pump B, water pump C be connected, described shunt conduit is connected with aqueduct respectively, be installed in pressure transmitter on the described aqueduct, described pressure transmitter is connected with described frequency conversion system.
Described water system based on programmable logic controller (PLC), described contactor comprises contactor KM1, contactor KM2, contactor KM3, contactor KM4, contactor KM5, contactor KM6, and described contactor KM4, described contactor KM5, described contactor KM6 are connected with described frequency conversion system respectively.
Described water system based on programmable logic controller (PLC), described frequency conversion system, described programmable logic controller (PLC) are connected with power supply respectively, and described power supply is connected with described contactor KM1, described contactor KM2, described contactor KM3 respectively.
Described water system based on programmable logic controller (PLC), described water pump A, described water pump B, described water pump C are installed on the shunt conduit respectively, described shunt conduit is connected with water supply line respectively, and described water supply line, described shunt conduit, described aqueduct are separately installed with control valve.
Described water system based on programmable logic controller (PLC), described frequency conversion system comprises motor, described motor is connected with frequency converter, described frequency converter is connected with braking resistor, AC reactor respectively, described AC reactor is connected with line breaker, described line breaker is connected with air switch, and described air switch is connected with power supply.
Described water system based on programmable logic controller (PLC), described pressure transmitter is pressure sensor.
Beneficial effect:
1. the utility model is equipped with air switch at frequency conversion system, and when frequency converter keeps in repair or time spent not for a long time, air switch makes frequency converter and isolated from power; When the frequency converter input side had short circuit or supply voltage to cross fault such as low, air switch can be protected.Contactor is controlled energising and the outage of frequency converter easily.
The practical AC reactor of the utility model improves power factor, reduces frequency converter to the harmonic wave injection of electrical network, weakens the unbalanced influence of three-phase mains voltage; When adopting braking resistor to make motor be in the regenerative braking state, avoid in DC loop, producing too high pump up voltage.
Description of drawings:
Accompanying drawing 1 is structural representation of the present utility model.
Accompanying drawing 2 is A-A sectional views of accompanying drawing 1.
Accompanying drawing 3 is major loop terminal distribution diagrams.
Accompanying drawing 4 is control loop terminal figure.
The specific embodiment:
Embodiment 1:
A kind of water system based on programmable logic controller (PLC), its composition comprises: programmable logic controller (PLC) 1, described programmable logic controller (PLC) is connected with frequency conversion system 2, contactor 3 respectively, described contactor respectively with the water pump A that installs on three shunt conduit, piece number: 4, water pump B, piece number: 5, water pump C, piece number: 6 connect, described shunt conduit is connected with aqueduct 7 respectively, be installed in pressure transmitter 8 on the described aqueduct, described pressure transmitter is connected with described frequency conversion system.
Embodiment 2:
According to embodiment 1 described water system based on programmable logic controller (PLC), described contactor comprises contactor KM1, contactor KM2, contactor KM3, contactor KM4, contactor KM513, contactor KM614, and described contactor KM4, described contactor KM5, described contactor KM6 are connected with described frequency conversion system respectively.
Embodiment 3:
According to embodiment 1 described water system based on programmable logic controller (PLC), described frequency conversion system, described programmable logic controller (PLC) are connected with power supply respectively, and described power supply is connected with described contactor KM1, described contactor KM2, described contactor KM3 respectively.
Embodiment 4:
According to embodiment 1 described water system based on programmable logic controller (PLC), described water pump A, described water pump B, described water pump C are installed in respectively on the shunt conduit 9, described shunt conduit is connected with water supply line 10 respectively, and described water supply line, described shunt conduit, described aqueduct are separately installed with control valve 11.
Embodiment 5:
According to embodiment 1 described water system based on programmable logic controller (PLC), described frequency conversion system comprises motor 12, described motor is connected with frequency converter 13, described frequency converter is connected with braking resistor 14, AC reactor 15 respectively, described AC reactor is connected with line breaker 16, described line breaker is connected with air switch 17, and described air switch is connected with power supply.
Described pressure transmitter is pressure sensor.
Embodiment 6:
The above-mentioned water system based on programmable logic controller (PLC), the selection of water pump:
Because constant pressure water supply will draw water to realize by water pump, so the selection of water pump should be placed above the other things.
The step of pump selection is as follows:
The first step is estimated the total (pumping) head of water pump: water pump total (pumping) head=landform lift+resistance of ducting lift+water pump pipeline resistance lift (3 meters)+equipment lift
The second step type selecting: according to total (pumping) head and flow 1 type selecting of tabling look-up, draw the several Model of pump that may use after, look into the water pump sample again, implementing any actually is the Model of pump that share most.
According to above analysis and native system at the user of residential quarter, the IS type centrifugal pump of selected homemade Yangtze River pump Co., Ltd's production already at last, IS type one step single sucking (axially sucking) centrifugal pump, be the energy-saving pump of national co-design, it is the more novel of BA type, Type B and other single-stage clear water centrifugal pumps.Advantage has: the complete series hydraulic performance is rationally distributed, and user's range of choice is wide, and maintenance is convenient; Efficient and suction journey reach the international average advanced level.Concrete model is IS65-0-250A, and its parameter sees Table 1:
Table 1 IS65-40-250A type water pump parameter
Embodiment 6:
The above-mentioned water system based on programmable logic controller (PLC), the selection of frequency converter:
System selects for use and aims at blower fan, pump with the frequency converter FRN55P11S-4Cx of Fuji of the general function type U/f control mode of load design, this is Fuji's frequency converter low noise high-performance multifunctional variable-frequency device, the P11S series of using for blower fan, pump, power bracket is 7.5 ~ 500KW, and this series carries guidance panel.Power carries direct current reactor greater than more than the 75KW.Can use and extend the cable option, can realize remote operation simply.High-performance and multi-functional desired combination, dynamic torque control, can under various service conditions, realize the Optimal Control to motor, have PG and feed back more high performance of control system, new mode is online from whole system, pulsation reduces greatly in the time of making the motor slow-speed of revolution, and the more convenient key panel that uses has adapted to all-environment structure.Its characteristics are: the dynamic torque vector control mode that adopts FUJI ELECTRIC to develop alone, and the starting torque when 0.5Hz can reach 200%; Have the many functions that make things convenient for that comprise self-setting function; Small-sized, totally-enclosed safeguard structure (22kW), range of capacity 0.2 ~ 400KW, machine is complete in specifications.P11S series has performance and the function of its inherence, i.e. during the control system of dynamic torque vector controlled, performance that band PG feedback is higher, the motor slow-speed of revolution pulsation reduce greatly, new mode online self-tuning system, fine environment compatibility.Have various communication functions, abundant utility function, defencive function.Frequency converter internal PID control module can be used for closed-loop control system, realizes constant pressure water supply.
Embodiment 7:
The above-mentioned water system based on programmable logic controller (PLC), frequency converter assembling circuit:
Leaded withstand voltage must conforming to the electric pressure of frequency converter.The major loop terminal distributes as accompanying drawing 3, and function declaration sees Table 2, the control loop terminal as shown in Figure 4, function declaration sees Table 3:
The explanation of table 2 major loop terminal
Table 3 control loop terminal function declaration
| Kind | The terminal symbol | The terminal function | Remarks |
Continuous table
The place that should be noted that during distribution has: power supply is according to the input power specification power supply of appointment; Air switch: when frequency converter keeps in repair or time spent not for a long time, air switch makes frequency converter and isolated from power; When the frequency converter input side had short circuit or supply voltage to cross fault such as low, air switch can be protected.Contactor: control energising and the outage of frequency converter easily.
Reactor: improve power factor; Reduce frequency converter to the harmonic wave injection of electrical network; Weaken the unbalanced influence of three-phase mains voltage.Braking resistor: when motor is in the regenerative braking state, avoid in DC loop, producing too high pump up voltage.
Claims (6)
1.
A kind of water system based on programmable logic controller (PLC), its composition comprises: programmable logic controller (PLC), it is characterized in that: described programmable logic controller (PLC) is connected with frequency conversion system, contactor respectively, described contactor respectively with three shunt conduit are installed on water pump A, water pump B, water pump C be connected, described shunt conduit is connected with aqueduct respectively, be installed in pressure transmitter on the described aqueduct, described pressure transmitter is connected with described frequency conversion system.
2.
Water system based on programmable logic controller (PLC) according to claim 1, it is characterized in that: described contactor comprises contactor KM1, contactor KM2, contactor KM3, contactor KM4, contactor KM5, contactor KM6, and described contactor KM4, described contactor KM5, described contactor KM6 are connected with described frequency conversion system respectively.
3.
Water system based on programmable logic controller (PLC) according to claim 1 and 2, it is characterized in that: described frequency conversion system, described programmable logic controller (PLC) are connected with power supply respectively, and described power supply is connected with described contactor KM1, described contactor KM2, described contactor KM3 respectively.
4.
Water system based on programmable logic controller (PLC) according to claim 1 and 2, it is characterized in that: described water pump A, described water pump B, described water pump C are installed on the shunt conduit respectively, described shunt conduit is connected with water supply line respectively, and described water supply line, described shunt conduit, described aqueduct are separately installed with control valve.
5.
Water system based on programmable logic controller (PLC) according to claim 1 and 2, it is characterized in that: described frequency conversion system comprises motor, described motor is connected with frequency converter, described frequency converter is connected with braking resistor, AC reactor respectively, described AC reactor is connected with line breaker, described line breaker is connected with air switch, and described air switch is connected with power supply.
6.
Water system based on programmable logic controller (PLC) according to claim 1 and 2 is characterized in that: described pressure transmitter is pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320125005 CN203160316U (en) | 2013-03-19 | 2013-03-19 | Water supply system based on programmable logic controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320125005 CN203160316U (en) | 2013-03-19 | 2013-03-19 | Water supply system based on programmable logic controller |
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| CN203160316U true CN203160316U (en) | 2013-08-28 |
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| CN 201320125005 Expired - Fee Related CN203160316U (en) | 2013-03-19 | 2013-03-19 | Water supply system based on programmable logic controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104731118A (en) * | 2015-01-28 | 2015-06-24 | 周正英 | Water supply system control method |
-
2013
- 2013-03-19 CN CN 201320125005 patent/CN203160316U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104731118A (en) * | 2015-01-28 | 2015-06-24 | 周正英 | Water supply system control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20150319 |
|
| EXPY | Termination of patent right or utility model |