A new type of intelligent electric valve controller general electric valve purchase technical requirements

A new type of intelligent electric valve controller general electric valve purchase technical requirements

An overview of the
DSM modular intelligent electric valve controller adopts advanced micro-processing technology, highly integrated IC chip and long-life power output device to accept DC4~20mA adjustment signal from the upper instrument and DC4~20mA valve feedback signal from the lower electric actuator (or “three-wire” signal of potentiometer), and output “on” and “off” signals. To realize the valve opening control and regulation. DSM modular intelligent electric valve controller, with digital setting, display, limit, motor blocking protection, broken wire alarm and valve self-calibration and other advanced functions. Stable and accurate control of valve, damper and baffle adjustment structure. It can be widely used in power generation, metallurgy, petroleum, chemical and other fields.
DSM modular intelligent electric valve controller can not only be used with single-phase AC motor actuator (such as DKJ and DKZ electric actuator), but also can be used with three-phase AC motor actuator, electric device. DSM modular intelligent electric valve controller and the traditional electric valve after use, in the reliability, stability, accuracy and other aspects can be improved several times more, for the transformation and improvement of the old electric actuator has brought new vitality.
Main Features:
Intelligent calibration: When calibrating the “zero” and “full” of the valve position opening and the output current of the valve position, there is no need to adjust the potentiometer or carry out complex debugging with the reference measuring instrument. As long as the actual “fully closed” and “fully open” positions of the valve are pressed once, the newly set interval will be automatically and accurately corrected to 0-100% and DC4-20mA.
The parameters of valve electric zone can be set digitally, with small overshoot, good stability and high control precision.
Free opening direction: When changing the opening direction of the valve and the mode of operation of the valve, there is no need to replace any wiring, which can be completed by setting the button.
Intelligent step: can avoid oscillation or over – “rush” phenomenon, improve the control accuracy.
Error detection and alarm function: Once the actuator fails, the intelligent error detection and alarm function can automatically detect and alarm, display the fault cause of the actuator and accurately indicate the running state of the actuator. According to different fault causes, different alarm signals are displayed, which will shorten the time required for troubleshooting and restore the actuator to normal working state as soon as possible.
Automatic phase protection: Before, in the field wiring, we must ensure the correct phase sequence of the three-phase AC power supplied to the actuator, because once the phase sequence is wrong, it will cause incorrect motor rotation, and then damage the valve and actuator. Now the user can completely save this trouble, no longer need to consider the phase sequence problem when wiring. When the field wiring phase is reversed, the phase synchronizer will automatically correct the phase to ensure that the valve performs as instructed. That is, when the actuator receives the open command, it always rotates in the preset open direction and will not run in the opposite direction because of the phase sequence switch.
Exception protection:
Motor overcurrent protection: When the actuator motor is running, the DSZH220 will automatically stop the motor due to a variety of reasons.
Instantaneous reverse protection: When the actuator is rotating in one direction, for example, when the valve is being opened, if the actuator receives the command to close the valve, the internal control logic of the actuator will delay a preset period of time before the command to close the valve is executed. This technology will reduce the impact of the motor current, extend the life of the power components, while preventing impact load on the valve stem, gear box and other mechanical transmission may cause damage, thus effectively protecting the motor.
Valve plug protection: If the actuator cannot overcome the torque required to start the valve, the condition for valve plug exists. When the actuator receives the start signal of open or close, if the valve is stuck, there is no action within the preset time, the internal circuit will disconnect the corresponding contact, forced to suspend the operation of the actuator, at the same time, send the corresponding alarm signal, in addition, the signal can also be output through RS485.
The alarm and protection mode can be set digitally when the input signal is disconnected.
Non-lossable read and write storage devices, easy to modify parameters, power off for a long time.
Automatic/manual no disturbance switch, good anti-interference.
Simple operation: although the operator has a lot of complex functions, but the internal software has been “trouble” to themselves, “convenient” to the user, making the man-machine dialogue operation is simple and easy to learn.
(The motor is directly controlled by the AC220V actuator, and the motor is the AC380V actuator, which needs to add the AC380V power driving device)
Technical Data
1. Scope of use
Applicable actuator: The supply voltage is 220V±15%(AC), the power is less than 150W, the common end, open and close three wire control the motor to open, close and stop.
Working environment: Ambient temperature: -20℃~55℃. Relative humidity: less than 90%.
2. Input signal
Adjust the input signal: 4 to 20mA (DC), input load impedance is less than 150Ω.
Opening input signal: potentiometer signal, 500Ω~5KΩ.
3. Output signal
Valve position feedback output signal: 4~20mA (DC, isolated), output with load capacity less than 450Ω.
Switch control signal: relay output. Contact capacity: 5A,250V(AC).
4. Precision of control
Sensitivity: 0.2%~3.0%.
5. Operation Instructions
Function selection: Press the “Function” button and do not release it. After 2 seconds, the current function will be transferred to the next function. The cycle direction is: Automatic (function indicator light on) – > Manual (function indicator light off) – > Parameter Setting 1 (function indicator light on quickly) – > Parameter setting 2 (function indicator light on slowly) – > Automatic (function indicator light on slowly).
Calibration: Press and hold the “Adjust” button when the non-set state is in place. After 2 seconds, confirm that the position is fully open. The indicator light of the valve is fully open for 2 seconds to indicate confirmation; Press and hold the “Adjust” button when the non-set state is in place. After 2 seconds, confirm that the position is fully closed. The indicator light of the valve fully closed will blink for 2 seconds for confirmation.
Setting: Hold down the “Function” button and do not release. After 2 seconds, the current function will be transferred to the next function. Repeat the preceding steps until you enter Parameter setting 1 (when the function indicator blinks quickly). Set sensitivity mode, open direction and input break mode by “Adjust” key. These three parameters are expressed in 4-bit binary, and the “adjust” key reduces the value cycle (1111-1110- > 1101-… – > 0000- > 1111). When you press Function to exit parameter 1 setting, the above parameters are automatically saved.
Press and hold the “Function” button. After 2 seconds, the current function will be transferred to the next function. Repeat the preceding steps until you enter Parameter setting 2 (when the function indicator blinks slowly). Use the “Adjust” key to set the sensitivity value. This sensitivity value is expressed in a 4-bit binary, and the “adjust” key reduces the value cycle (1111-1110- > 1101-… – > 0000- > 1111), it ** the sensitivity value when setting sensitivity mode to fixed mode in parameter Setting 1. Press the Function key again to exit the parameter 2 setting. The above parameters are automatically saved. (After setting the sensitivity as self-adjusting mode in parameter setting 1, parameter setting 2 does not appear in the function selection cycle, and the sensitivity value will be automatically calculated by the module for the target and adjusted in time.)
Mode of operation
Manual: Hold down the “Function” button, and transfer from the current function to the next function after 2 seconds. Repeat the above operations until the hand dynamic (function indicator is off). When stopping the valve, open and close the valve respectively through the “function” key (the continuous pressing time should be less than 2 seconds, otherwise it is considered as function selection) and the “Adjust” key. During the opening process, the valve on light (digit 1 light) flashes and lights up to the fully on position; during the closing process, the valve off light (digit 0 light) flashes and lights up to the fully off position. To stop the valve, press the “Adjust” key when opening the valve or press the “Function” key when closing the valve (the continuous holding time is less than 2 seconds).
Automatic: Hold down the “Function” button and do not release. After 2 seconds, the current function will be transferred to the next function. Repeat the above operations until entering the self-dynamic (function indicator light on), automatic control valve opening, closing, stop, make the valve opening and adjustment input consistent.
6. Software Functions
Reversing delay protection.
Automatic orientation.
Automatically adjust the point range and step length.
Manual or self-tuning sensitivity (dead zone).
Open direction free setting.
Input line break mode selection (on, off, set, stop).
7. Control parameters can be set
Setting parameters is accomplished by the “Function” and “Adjust” keys, with a function indicator (green) and four digit indicators (red) showing the Settings.
During parameter setting, the Function key is used to select and save parameter Settings, and the Adjust key is used to adjust parameter values. For details, see Function Selection and Setting terms in the preceding operation description.
In the process of parameter setting, indicator LED1 displays the 0th bit (BIT0) of the set parameter. On ** the bit is 1 and off ** the bit is 0; Indicator LED2 displays the first bit of the set parameter (BIT1), when the light is on ** the bit is 1, when the light is off ** the bit is 0; Indicator LED3 displays the second bit of the set parameter (BIT2), when the light is on ** the bit is 1, when the light is off ** the bit is 0; Indicator LED4 displays the third bit (BIT3) of the set parameter. On ** the bit is 1. Off ** the bit is 0.
When parameter setting 1 (function indicator flash), the sensitivity mode is indicated by LED4 (BIT3) (BIT3 is 0: manual adjustment, and the sensitivity value is set in setting state 2; BIT3 is 1: self-tuning); LED3 (BIT2) indicates the open direction (BIT2 is 0: positive; BIT2 is 1: reverse), and LED2 and LED1 (BIT1BIT0) indicate the input disconnection mode (BIT1BIT0 is 00: stop valve; BIT1 BIT0 is 01: set to medium. BIT1 BIT0 is 10: turn off the valve; BIT1 BIT0 is 11: open valve).
When setting state 2 (the function indicator blinks slowly), the sensitivity value is indicated by LED4-leD1 (bit4-bit0) (BIT3BIT2BIT1BIT0 is 0001: the sensitivity is 0.2%; BIT3BIT2BIT1BIT0 is 0010: the sensitivity is 0.4%; BIT3BIT2BIT1BIT0 is 0011: sensitivity is 0.6%; … ; BIT3BIT2BIT1BIT0 is 1111: sensitivity is 3.0%).
For example, if LED4 is off while LED3, LED2, and LED1 are on during parameter setting 1 (the function indicator blinks quickly), the value of parameter 1 is 0111 in four-bit binary format. Its LED4 light off (BIT3=0) means that the sensitivity is set as the parameter value in parameter setting 2; its LED3 on (BIT2=1) means reverse control (4mA fully on and 20mA fully off); its LED2 and LED1 on (BIT1 BIT0=11) means that when the input line is disconnected, the valve will run until it is fully open. When setting state 2 (function indicator blinks slowly), if LED4 is on and LED3, LED2 and LED1 are off, then parameter 2 is represented by a 4-bit binary value of 1000, which means that the sensitivity value is set to 1.6%.
8. Interface RS232 RS485
General electric valve procurement technical requirements
General electric valve procurement technical requirements
Electric valve procurement only clear specifications, categories, work pressure to meet the procurement requirements of the approach, in the current market economic environment is not perfect. Because the electric valve manufacturers in order to product competition, they are in the unified design of the electric valve under the idea of different innovation, the formation of their own enterprise standards and product personality. Therefore, it is very necessary to put forward detailed technical requirements in the procurement of electric valves and achieve consensus through coordination with manufacturers as an attachment to the procurement contract of electric valves.
1. General requirements
1.1 Specifications and categories of electric valves shall conform to the requirements of pipeline design documents.
1.2 The model of electric valve should be indicated according to the national standard numbering requirements. If the enterprise standard, should indicate the relevant description of the model.
1.3 The working pressure of the electric valve requires that the working pressure of the pipeline should be greater than the actual working pressure of the pipeline under the premise of not affecting the price; Any side of the electric valve closed condition should be able to withstand 1.1 times the electric valve pressure value without leakage; Electric valve open condition, the valve body should be able to withstand the requirements of two times the electric valve pressure.
1.4 The manufacturing standard of electric valve should indicate the national standard number based on. If it is the enterprise standard, the enterprise document should be attached to the purchase contract.
2. Electric valve quality standard
2.1 The body material shall be mainly nodular cast iron, and the grade and actual physical and chemical test data of cast iron shall be indicated.
2.2 Stem material, strive to stainless steel stem (2CR13), large caliber electric valve should also be stainless steel nested stem.
2.3 The nut is made of cast aluminum brass or cast aluminum bronze, and the hardness and strength are greater than the valve stem.
2.4 The hardness and strength of the valve stem bushing material shall not be greater than the valve stem, and there shall be no electrochemical corrosion with the valve stem and valve body under the condition of water immersion.
2.5 Material of sealing surface
(1) There are different types of electric valves, different sealing methods and material requirements;
(2) For ordinary wedge gate valve, the material, fixing method and grinding method of copper ring should be explained;
③ Physical, chemical and health test data of soft seal gate valve and valve plate lining rubber material;
(4) Butterfly valve should indicate the sealing surface material on the valve body and the sealing surface material on the butterfly plate; Physical and chemical test data of butterfly valve, especially the health requirements of rubber, anti-aging properties, wear resistance; Usually, butadiene rubber and EPDM rubber are used, and recycled rubber is strictly prohibited.
2.6 Packing of valve shaft
(1) Because the electric valve in the pipe network is usually opened and closed infrequently, the packing is not active in several years, the packing is not aging, and the sealing effect is maintained for a long time;
(2) The valve shaft packing should also withstand frequent opening and closing, sealing effect is good;
(3) In view of the above requirements, the valve shaft packing should not be replaced for a lifetime or more than 10 years;
④ If the packing needs to be replaced, the electric valve design should consider the replacement measures under the condition of water pressure.
3. Variable speed transmission box
3.1 The box material and internal and external anticorrosion requirements are consistent with the principle of the valve body.
3.2 The box should be sealed and can withstand immersion of 3 meters of water column after assembly.
3.3 The adjusting nut of the opening and closing limit device on the box should be located inside or outside the box, but only the first tool can be used for operation.
3.4 Reasonable transmission structure design, opening and closing can only drive the valve shaft rotation, do not make it move up and down, the transmission parts bite appropriate, do not produce load when opening and closing separation slip.
3.5 The sealing place between the gearbox and the valve shaft shall not be connected into a leak-free whole, otherwise, reliable measures should be taken to prevent serial leakage.
3.6 There is no sundry matter in the gearbox, and the gear occlusal part should be protected by grease.
4. Operating mechanism of electric valve
4.1 The opening and closing direction of the electric valve during operation should be closed clockwise.
4.2 Because the electric valve in the pipe network is often opened and closed manually, the opening and closing revolutions should not be too much, even the large caliber electric valve should also be within 200-600 revolutions.
4.3 In order to facilitate the operation of opening and closing by one person, under the condition of plumber pressure,