CN102777887A - Protection control device and protection control method for constant-differential-pressure electric adjusting valve for water-supply of boiler - Google Patents
Protection control device and protection control method for constant-differential-pressure electric adjusting valve for water-supply of boiler Download PDFInfo
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Abstract
The invention discloses a protection control device and a protection control method for a constant-differential-pressure electric adjusting valve for water-supply of a boiler and relates to an industrial controlling device and a control method. The protection control device for the electric adjusting valve comprises a PLC (programmable logic control) system, a pressure transmitter I, a pressure transmitter II, a frequency converter and an operation panel. The PLC system comprises a CPU (center processing unit) module, a power source module, an Ethernet communication module, an analog input module, a digital input module, an analog output module and a digital output module, wherein the CPU module is connected with the other modules of the PLC system respectively. The control method utilizes the control device to automatically protect the electric adjusting valve and enable the electric adjusting valve not to halt and stop working due to overload protection of an inner motor when water is supplied to the boiler. The control method includes the following steps of setting differential pressure values at two ends of the electric adjusting valve, collecting pressure at the front and the rear ends of the electric adjusting valve and working condition of the frequency converter, processing differential pressure control information, controlling output of differential pressure values, and displaying monitoring. The protection control device for the constant-differential-pressure electric adjusting valve for water supply of the boiler is safe, high in control precision, low in energy consumption, high in degree of automation, high in reliability and the like.
Description
Technical field
The present invention relates to a kind of industrial control device and control method, particularly a kind of permanent differential pressure boiler water supply motorized adjustment valve protection control device and control method.
Background technology
In a lot of boiler feed systems, the boiler water supply pump generally is to need the H-Max Demand Design and with the driving of motor power frequency drive manner, adopt the aperture of automatic controlling system water supply electric control valve to carry out liquid level control then by boiler.Therefore supply-water pump lift surplus is very big, and the hydraulic pressure that electric control valve is produced is very high, needs the motor of electric control valve to be in higher load condition or overload state during the motorized adjustment valve events and could export enough power and move.When boiler is moving with wave, can cause that water level frequently changes; The water supply automatic control system can frequently provide action command to electric control valve; Make electric control valve motor overheating after long-time high load capacity of electric control valve or the overwork; Cause electric control valve motor heat protection and quit work, thereby make water level uncontrollable.In this case, if boiler liquid level this moment is very low, can not in time strengthens output again and carry out moisturizing, pot can occur doing even the bursting of boilers takes place, be breakneck potential safety hazard.
Summary of the invention
The objective of the invention is to shut down idle safety problem because of its motor internal overload protection causes electric control valve to prior art boiler water supply electric control valve, provide a kind of and can effectively improve boiler safety property, reach high-accuracy and constant differential pressure control effect, make the reduction of boiler feed pump energy consumption, automaticity and reliability is high, simple to operate, man-machine interface is friendly, easy to adjust, simple in structure permanent differential pressure boiler water supply motorized adjustment valve protection control device and control method.
The present invention for realizing the technical scheme that above-mentioned purpose adopts is: a kind of permanent differential pressure boiler water supply motorized adjustment valve protection control device; This motorized adjustment valve protection control device comprises PLC control system, pressure transmitter I, pressure transmitter II, frequency converter and guidance panel; PLC control system comprises CPU module and the power module that is connected with the CPU module respectively, ethernet communication module, analog quantity input module I, analog quantity input module II, digital quantity input module, analog output module, digital quantity output module; The pressure transmitter I is installed on the outside tube wall of boiler water supply electric control valve front-end pipelines; The pressure transmitter II is installed on the outside tube wall of boiler water supply electric control valve rear end pipeline; The output of pressure transmitter I, pressure transmitter II is connected with the input of analog quantity input module I respectively; Frequency converter is connected on the motor of boiler feed pump and controls the machine operation of boiler feed pump; The output of frequency converter is connected with the input of analog quantity input module II and digital quantity input module respectively; The input of frequency converter is connected with the output of analog output module and digital quantity output module respectively; Analog quantity input module I, analog quantity input module II and digital quantity input module are connected with the CPU module through core bus, and analog output module and digital quantity output module are connected with the CPU module through core bus, and guidance panel is connected with the ethernet communication module.
Wherein said analog quantity input module I is 8 tunnel 12 4-20mA, 2 line system analog quantity input modules; Pressure transmitter I, pressure transmitter II are 2 line system 4-20mA pressure transmitters, and pressure transmitter I, pressure transmitter II are connected with the input of analog quantity input module I through 2 core cables respectively.
Wherein said analog quantity input module II is 8 tunnel 12 4-20mA, 4 line system analog quantity input modules; Digital quantity input module is 32 road digital quantity input modules, and the output of frequency converter is connected with the input of analog quantity input module II and digital quantity input module through multicore cable respectively.
Wherein said analog output module is 8 tunnel 12 4-20mA analog quantity input modules; The digital quantity output module is 32 road digital quantity output modules, and the input of frequency converter is connected with the output of analog output module and digital quantity output module through multicore cable respectively.
Wherein said power module is the DC24V DC power supplier.
Wherein said PLC control system is the S7-300 series of PLC; The CPU module is CPU315-2DP; Power module is PS307; The ethernet communication mould is CP343-1 Lean, and analog quantity input module I, analog quantity input module II and analog output module are SM331, and digital quantity input module, digital quantity output module are SM321.
The quantity of wherein said frequency converter and the quantity of boiler feed pump are complementary, i.e. boiler feedwater pump work of the corresponding control of frequency converter.
The present invention also provides should perseverance differential pressure boiler water supply motorized adjustment valve protection control method; This control method is to utilize the above-mentioned permanent differential pressure boiler water supply motorized adjustment valve protection control device of being made up of PLC control system, pressure transmitter I, pressure transmitter II, frequency converter and guidance panel of the present invention to protect electric control valve that it can not shut down because of electric control valve motor internal overload protection when boiler water supply automatically not work, and comprising: differential pressure controlling value, electric control valve rear and front end pressure acquisition and the collection of frequency converter duty, differential pressure control information processing, differential pressure controlling value output control, demonstration that the electric control valve two ends are set are kept watch on; Its step is following:
Step 1: the differential pressure controlling value that the electric control valve two ends are set: by the differential pressure controlling value of guidance panel input electric control valve rear and front end; PLC control system is through its inner ethernet communication module and guidance panel communication, the differential pressure controlling value of the electric control valve rear and front end of importing on the read operation panel;
Step 2: electric control valve rear and front end pressure acquisition and frequency converter duty are gathered; Electric control valve rear and front end pressure acquisition: gather the current force value in electric control valve rear and front end from the pressure transmitter I, the pressure transmitter II that are installed on the pipeline of boiler water supply electric control valve front and back end, the CPU module of pressure signal being passed to PLC control system through the analog quantity input module I of PLC control system supplies its calculating to use; The frequency converter duty is gathered: the CPU module that frequency converter work at present status information data is passed to PLC control system through the analog quantity input module II and the digital quantity input module of PLC control system;
Step 3: the differential pressure control information is handled: according to the current force value in differential pressure controlling value, the electric control valve rear and front end of electric control valve rear and front end, frequency converter work at present status information data, the CPU module of being controlled system by PLC draws the pressure reduction controlling value through the fuzzy algorithm computation;
Step 4: differential pressure controlling value output control: the CPU module of PLC control system is passed to frequency converter with the pressure reduction controlling value that calculates in the step 3 through the analog output module of PLC control system, and frequency converter is realized the control to differential pressure before and after the electric control valve according to the rotating speed that the frequency conversion of pressure reduction controlling value changes boiler feed pump;
Step 5: show and keep watch on: the differential pressure control parameter of the differential pressure controlling value at the electric control valve two ends of display working condition, setting on guidance panel, the actual differential pressure value at electric control valve two ends and electric control valve.
Wherein in said step 4, the CPU module of PLC control system is given frequency converter through the digital quantity output module output control frequency converter start and stop or the fault repositioning information of PLC control system.
Owing to adopted such scheme, the present invention has following beneficial effect with existing other similar compared with techniques:
1, improves boiler safety property
After using the present invention's permanent differential pressure boiler water supply motorized adjustment valve protection control device; Gather the forward and backward pressure signal of boiler water supply electric control valve by pressure transmitter I, II; Pressure signal is passed to the CPU module of PLC control system through analog quantity input module I; The CPU module is controlled the frequency of frequency converter automatically according to pressure differential, the flow size of the frequency adjustment boiler feed pump through the control frequency converter, and pressure reduction diminishes and stable before and after the boiler water supply electric control valve; The power that needs when making boiler water supply motorized adjustment valve events diminishes, and the motor of electric control valve can not shut down because of the overload heating causes protection; Electric control valve phenomenon of being failure to actuate out of control can not appear in boiler (especially constantly urgent) in running; Significantly improved boiler safety property.
2, can reach the effect of high-accuracy and constant differential pressure control
In the present invention's the permanent differential pressure boiler water supply motorized adjustment valve protection control device; Be connected with analog quantity input module II through digital quantity input module between frequency converter and the CPU module; Obtain frequency converter work at present status information; Through guidance panel (can be touch-screen or PC computer) the differential pressure controlling value is set, the control parameter foundation of Fuzzy PID when handling as the differential pressure control information; Pressure transmitter I, II are gathered boiler water supply electric control valve rear and front end current pressure value; After standard signal is sent into analog quantity input module I; Analog quantity input module I is given CPU module with signal again, and PLC control system exports to frequency converter through analog output module with the pressure reduction controlling value after through the fuzzy computing, makes frequency converter carry out VFC to boiler feed pump; In running, overshoot can be above 5% of differential pressure value is set through the experiment proof.
3, the boiler feed pump energy consumption reduces
In the present invention's the permanent differential pressure boiler water supply motorized adjustment valve protection control device,, make boiler feed pump when ordinary production owing to adopt frequency converter VFC boiler feed pump to feed water; Can be when not needing power frequency running at full speed according to demand work; Promptly under the speed of needs, turn round, can effectively reduce the power consumption of boiler feed pump, because from the security consideration design; Boiler feedwater pump lift surplus is big; And during the boiler ordinary production, boiler feed pump only needs under about 60% speed at full speed, turn round and gets final product, so compared with prior art can save electric weight 30% at least.
4, automaticity and reliability are high, simple to operate
When using the present invention's permanent differential pressure boiler water supply motorized adjustment valve protection control device, only need press parameter is provided with button, gets into promptly that the differential pressure controlling value is provided with state or differential pressure control parameter is provided with state; At this moment, the operator only need can be provided with state parameter setting to differential pressure control through guidance panel (can be touch-screen or PC computer); The differential pressure control procedure is full automatic; Reliability is high, need not use miscellaneous equipment, and it is very convenient to operate.
5, man-machine interface is friendly
Use in the present invention's the permanent differential pressure boiler water supply motorized adjustment valve protection control device process; Can go up through guidance panel (display screen of touch-screen or PC computer) and show the dynamic value of differential pressure in real time and controlling value is set; Be provided with in the differential pressure parametric procedure through guidance panel again; Also can show the parameter value that is provided with through guidance panel, operating process comes into plain view, and man-machine interface is friendly.
6, simple, the parameter regulation good stability of the present invention's permanent differential pressure boiler water supply motorized adjustment valve protection control device overall structure, reliable operation, easy to adjust.
Below in conjunction with accompanying drawing and embodiment permanent differential pressure boiler water supply motorized adjustment valve protection control device of the present invention and control method are described further.
Description of drawings
Fig. 1 is the block diagram of the permanent differential pressure boiler water supply of the present invention motorized adjustment valve protection control device;
Fig. 2 is the PID control principle block diagram of the permanent differential pressure boiler water supply of the present invention motorized adjustment valve protection control method;
Fig. 3 is the PID control flow block diagram of the permanent differential pressure boiler water supply of the present invention motorized adjustment valve protection control method.
The specific embodiment
As shown in Figure 1; The permanent differential pressure boiler water supply of the present invention motorized adjustment valve protection control device; It is the permanent differential pressure control device of a kind of closed loop fuzzy; This motorized adjustment valve protection control device comprises PLC control system 1, pressure transmitter I, pressure transmitter II, frequency converter and guidance panel; PLC control system 1 comprises CPU module and the power module that is connected with the CPU module respectively, ethernet communication module, analog quantity input module I, analog quantity input module II, digital quantity input module, analog output module, digital quantity output module; Electric control valve is installed in the pipeline of boiler feedwater pump output terminal, and the pressure transmitter I is installed on the outside tube wall of boiler water supply electric control valve front-end pipelines, and the pressure transmitter II is installed on the outside tube wall of boiler water supply electric control valve rear end pipeline; The output of pressure transmitter I, pressure transmitter II is connected with the input of analog quantity input module I respectively; Frequency converter is connected on the motor of boiler feed pump and controls the machine operation of boiler feed pump, and the quantity of frequency converter and the quantity of boiler feed pump are complementary, and the motor of transducer power and boiler feed pump is complementary; A frequency converter and a boiler feed pump only are shown among the figure; The quantity of frequency converter can be many, as long as corresponding with the quantity of boiler feed pump, promptly a frequency converter correspondence is controlled a boiler feedwater pump work.The output of frequency converter is connected with the input of analog quantity input module II and digital quantity input module respectively; The input of frequency converter is connected with the output of analog output module and digital quantity output module respectively; Analog quantity input module I, analog quantity input module II and digital quantity input module are connected with the CPU module through core bus; Analog output module and digital quantity output module are connected through core bus and CPU module, and guidance panel is connected with the ethernet communication module.Each module of PLC control system 1 is separately positioned on the PLC backboard, and links to each other through the PLC backboard.
Said analog quantity input module I is 8 tunnel 12 4-20mA, 2 line system analog quantity input modules; Pressure transmitter I, pressure transmitter II are 2 line system 4-20mA pressure transmitters, and pressure transmitter I, pressure transmitter II are connected with 1 tunnel analog input channel terminal (not shown) of analog quantity input module I input through 2 core cables respectively.Said analog quantity input module II is 8 tunnel 12 4-20mA, 4 line system analog quantity input modules; Digital quantity input module is 32 road digital quantity input modules, and the output of frequency converter is connected with 1 tunnel analog input channel (not shown) of analog quantity input module II input and 3 road digital quantity input channel (not shown)s of digital quantity input module input through multicore cable respectively.Said analog output module is 8 tunnel 12 4-20mA analog quantity input modules; The digital quantity output module is 32 road digital quantity output modules, the input of frequency converter respectively 1 tunnel analog input channel (not shown) through multicore cable and analog output module output and digital quantity output module output 2 the tunnel be that digital quantity output channel respective channel terminal (not shown) is connected.Said power module is the DC24V DC power supplier, and PLC control system 1 inner all modules are supplied power through the PLC backboard by the DC24V DC power supplier.PLC control system 1 is the S7-300 series of PLC; The CPU module is CPU315-2DP; Power module is PS307; The ethernet communication mould is CP343-1 Lean, and analog quantity input module I, analog quantity input module II and analog output module are SM331, and digital quantity input module, digital quantity output module are SM321.
The permanent differential pressure boiler water supply of the present invention motorized adjustment valve protection control method; This control method is to utilize the above-mentioned permanent differential pressure boiler water supply motorized adjustment valve protection control device of being made up of PLC control system, pressure transmitter I, pressure transmitter II, frequency converter and guidance panel of the present invention to protect electric control valve that it can not shut down because of electric control valve motor internal overload protection when boiler water supply automatically not work, and comprising: differential pressure controlling value, electric control valve rear and front end pressure acquisition and the collection of frequency converter duty, differential pressure control information processing, differential pressure controlling value output control, demonstration that the electric control valve two ends are set are kept watch on; Its step is (the PID control principle of control method and control flow block diagram can referring to Fig. 2, shown in 3) as follows:
Step 1: the differential pressure controlling value that the electric control valve two ends are set: by the differential pressure controlling value of guidance panel (can be touch-screen or PC computer) input electric control valve rear and front end; PLC control system is through its inner ethernet communication module and guidance panel communication; The differential pressure controlling value of the electric control valve rear and front end of importing on the PLC control system read operation panel is passed to the CPU module that PLC controls system through the PLC backboard with the differential pressure controlling value of the electric control valve rear and front end of setting;
Step 2: electric control valve rear and front end pressure acquisition and frequency converter duty are gathered; Electric control valve rear and front end pressure acquisition: gather the current force value in electric control valve rear and front end from the pressure transmitter I, the pressure transmitter II that are installed on the pipeline of boiler water supply electric control valve front and back end; The data that collect convert standard 4-20mA analog quantity transmission signal to through pressure transmitter I, II inside chip; Transfer signals to the analog quantity input module I that PLC controls system 1 through 2 core cables, the CPU module of pressure signal being passed to PLC control system through the analog quantity input module I of PLC control system supplies it to calculate usefulness; The frequency converter duty is gathered: adopting a frequency converter to drive a boiler feed pump pattern is the boiler coupling; The power of motor of transducer power and boiler feed pump is complementary; The CPU module that frequency converter work at present status information data is passed to PLC control system through the analog quantity input module II and the digital quantity input module of PLC control system; Be specially: frequency converter work at present status information data is transferred to the analog quantity input module II of PLC control system and the input of digital quantity input module through multicore cable; Pass to the CPU module by analog quantity input module II and digital quantity input module; Supply to keep watch on and use, analog quantity input module II is with the instantaneous velocity of transmission boiler feed pump motor, and digital quantity input module is with the switching signal and the fault-signal of transmission boiler feed pump;
Step 3: the differential pressure control information is handled: according to the current force value in differential pressure controlling value, the electric control valve rear and front end of electric control valve rear and front end, frequency converter work at present status information data, the CPU module of being controlled system by PLC draws the pressure reduction controlling value through the fuzzy algorithm computation;
Step 4: differential pressure controlling value output control: the CPU module of PLC control system is passed to frequency converter with the pressure reduction controlling value that calculates in the step 3 through the analog output module of PLC control system, and frequency converter is realized the control to differential pressure before and after the electric control valve according to the rotating speed that the frequency conversion of pressure reduction controlling value changes boiler feed pump; Simultaneously, the CPU module of PLC control system is given frequency converter through the digital quantity output module output control frequency converter start and stop or the fault repositioning information of PLC control system; As on guidance panel manually by the start and stop key, the CPU module of PLC control system is received behind the signal promptly and can start stop signal be passed to frequency converter through the digital quantity output module that PLC controls system; When boiler feed system broke down, the CPU module can quit work through digital quantity output module control frequency converter automatically, and boiler feed pump is also corresponding to quit work, and the control frequency converter quits work automatically and mainly realized by software control;
Step 5: show and keep watch on: the differential pressure of the actual differential pressure value at the differential pressure controlling value at the electric control valve two ends of display working condition, setting, electric control valve two ends and electric control valve control parameter on the display screen (not shown) of guidance panel.
As variation of the present invention: when the quantity of boiler feed pump was N (N for greater than 1 integer) platform, the quantity of frequency converter also be N (N for greater than 1 integer) platform, needs only the quantity of frequency converter and the quantity of boiler feed pump and is complementary; When the quantity of boiler feed pump and frequency converter is many; The quantity of the digital quantity input module of PLC control system, digital quantity output module, analog quantity input module (comprising analog quantity input module I, II), analog output module with the matching relationship of N is respectively: the quantity of digital quantity input module is 3/32 of N *; 2/32 of the quantity N * of digital quantity output module; The quantity N of analog quantity input module/8+1 piece; The quantity N of analog output module/8 piece can add any amount spare module simultaneously on the quantity of aforementioned matching relationship quantity; The model of each module is not limited to the cited model of the foregoing description in the PLC control system, also can be the device that has other model of same or similar performance with above-mentioned model, as long as the conversion of being done within the scope of the invention all belongs to category of the present invention.
Claims (9)
1. permanent differential pressure boiler water supply motorized adjustment valve protection control device; It is characterized in that; This motorized adjustment valve protection control device comprises PLC control system, pressure transmitter I, pressure transmitter II, frequency converter and guidance panel; PLC control system comprises CPU module and the power module that is connected with the CPU module respectively, ethernet communication module, analog quantity input module I, analog quantity input module II, digital quantity input module, analog output module, digital quantity output module; The pressure transmitter I is installed on the outside tube wall of boiler water supply electric control valve front-end pipelines; The pressure transmitter II is installed on the outside tube wall of boiler water supply electric control valve rear end pipeline; The output of pressure transmitter I, pressure transmitter II is connected with the input of analog quantity input module I respectively; Frequency converter is connected on the motor of boiler feed pump and controls the machine operation of boiler feed pump; The output of frequency converter is connected with the input of analog quantity input module II and digital quantity input module respectively, and the input of frequency converter is connected with the output of analog output module and digital quantity output module respectively, and analog quantity input module I, analog quantity input module II and digital quantity input module are connected with the CPU module through core bus; Analog output module and digital quantity output module are connected through core bus and CPU module, and guidance panel is connected with the ethernet communication module.
2. permanent differential pressure boiler water supply motorized adjustment valve protection control device as claimed in claim 1; It is characterized in that; Said analog quantity input module I is 8 tunnel 12 4-20mA, 2 line system analog quantity input modules; Pressure transmitter I, pressure transmitter II are 2 line system 4-20mA pressure transmitters, and pressure transmitter I, pressure transmitter II are connected with the input of analog quantity input module I through 2 core cables respectively.
3. permanent differential pressure boiler water supply motorized adjustment valve protection control device as claimed in claim 1; It is characterized in that; Said analog quantity input module II is 8 tunnel 12 4-20mA, 4 line system analog quantity input modules; Digital quantity input module is 32 road digital quantity input modules, and the output of frequency converter is connected with the input of analog quantity input module II and digital quantity input module through multicore cable respectively.
4. permanent differential pressure boiler water supply motorized adjustment valve protection control device as claimed in claim 1; It is characterized in that; Said analog output module is 8 tunnel 12 4-20mA analog quantity input modules; The digital quantity output module is 32 road digital quantity output modules, and the input of frequency converter is connected with the output of analog output module and digital quantity output module through multicore cable respectively.
5. permanent differential pressure boiler water supply motorized adjustment valve protection control device as claimed in claim 1 is characterized in that said power module is the DC24V DC power supplier.
6. permanent differential pressure boiler water supply motorized adjustment valve protection control device as claimed in claim 1; It is characterized in that said PLC control system is the S7-300 series of PLC, the CPU module is CPU315-2DP; Power module is PS307; The ethernet communication mould is CP343-1 Lean, and analog quantity input module I, analog quantity input module II and analog output module are SM331, and digital quantity input module, digital quantity output module are SM321.
7. permanent differential pressure boiler water supply motorized adjustment valve protection control device as claimed in claim 1 is characterized in that the quantity of said frequency converter and the quantity of boiler feed pump are complementary, i.e. boiler feedwater pump work of the corresponding control of frequency converter.
8. permanent differential pressure boiler water supply motorized adjustment valve protection control method; This control method is to utilize the above-mentioned permanent differential pressure boiler water supply motorized adjustment valve protection control device of being made up of PLC control system, pressure transmitter I, pressure transmitter II, frequency converter and guidance panel of the present invention to protect electric control valve that it can not shut down because of electric control valve motor internal overload protection when boiler water supply automatically not work, and comprising: differential pressure controlling value, electric control valve rear and front end pressure acquisition and the collection of frequency converter duty, differential pressure control information processing, differential pressure controlling value output control, demonstration that the electric control valve two ends are set are kept watch on; Its step is following:
Step 1: the differential pressure controlling value that the electric control valve two ends are set: by the differential pressure controlling value of guidance panel input electric control valve rear and front end; PLC control system is through its inner ethernet communication module and guidance panel communication, the differential pressure controlling value of the electric control valve rear and front end of importing on the read operation panel;
Step 2: electric control valve rear and front end pressure acquisition and frequency converter duty are gathered; Electric control valve rear and front end pressure acquisition: gather the current force value in electric control valve rear and front end from the pressure transmitter I, the pressure transmitter II that are installed on the pipeline of boiler water supply electric control valve front and back end, the CPU module of pressure signal being passed to PLC control system through the analog quantity input module I of PLC control system supplies its calculating to use; The frequency converter duty is gathered: the CPU module that frequency converter work at present status information data is passed to PLC control system through the analog quantity input module II and the digital quantity input module of PLC control system;
Step 3: the differential pressure control information is handled: according to the current force value in differential pressure controlling value, the electric control valve rear and front end of electric control valve rear and front end, frequency converter work at present status information data, the CPU module of being controlled system by PLC draws the pressure reduction controlling value through the fuzzy algorithm computation;
Step 4: differential pressure controlling value output control: the CPU module of PLC control system is passed to frequency converter with the pressure reduction controlling value that calculates in the step 3 through the analog output module of PLC control system, and frequency converter is realized the control to differential pressure before and after the electric control valve according to the rotating speed that the frequency conversion of pressure reduction controlling value changes boiler feed pump;
Step 5: show and keep watch on: the differential pressure control parameter of the differential pressure controlling value at the electric control valve two ends of display working condition, setting on guidance panel, the actual differential pressure value at electric control valve two ends and electric control valve.
9. permanent differential pressure boiler water supply motorized adjustment valve protection control method as claimed in claim 8; It is characterized in that; In said step 4, the CPU module of PLC control system is given frequency converter through the digital quantity output module output control frequency converter start and stop or the fault repositioning information of PLC control system.
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