December 23, 2024
I. Fisher positioner features
1, control valve diagnostic test capability
Connections, receivers and other hardware can be easily installed between the positioner and the actuator so that the valve diagnostic system can be used for diagnostic testing of the actuator, positioner assembly, and valve.
2、Flexible modular design
The electrical-to-pneumatic converter assembly can be used to replace the measurement module, which is attached to the positioner housing, providing a very economical replacement. Robust and easy to maintain. The main module can be removed from the instrument housing without disconnecting field wiring, pneumatic connections or stem connections.
3. Stable operation
Changes in valve load and gas supply pressure have a negligible effect on the positioner.
4、Field replaceable acting direction
Can be interchanged between the reverse and positive action only need to adjust the unit.
5、Wide adjustable range
The positioner has the ability to divide the range. The range and zero adjustment range allows the use of all standard input signals, including the ranging input signal.
6, corrosion resistance
Components, gaskets and housing materials are designed to withstand harsh environments. The positioner provides additional protection while venting air and cleaning internal parts.
7、Reduce spare parts inventory
As a positioner series of various units can be used in a variety of control occasions, only few spare parts are required to support the application needs of the positioner plant-wide.
8、Positioner easy to adjust
After removing the shell, you can use common hand tools to adjust the zero and range, in which it is easy to find the adjustment screws.
9、Effective, good seismic performance
Fisher valve positioners offer a field-proven positioner structure. Its low steady-state air consumption makes it work more efficiently. It can withstand vibration in most factory environments, especially with its fast response and high accuracy.
Second, Fisher positioner debugging
Intelligent Fisher positioner needs to be debugged before use, we are talking about Fisher DVC6200 and DVC2000 debugging steps.
1, DVC6200 debugging (Rosemount 475 hand manipulator as an example)
*** step: connect the Rosemount 475 hand manipulator
1, enter the interface, select HART;
2, select online after enter;
3、If there is an alarm signal, select YES and enter;
4, online drop-down menu select configure (configuration) and press enter;
5, select calibration (calibration) menu and then press enter;
6, select autocalibration;
7, warning menu select outofservice;
8, select CONTINUE after enter select travelcontrol;
9, the valve automatic calibration without operation, just wait until the following interface;
10, automatic calibration completed OK button to confirm;
11, select OK;
12, modified to become inservice status, calibration is complete.
Step 2: DVC positioner feedback debugging instructions
1, in the configure (configuration) menu select manualsetup;
2, select the mode protection will inservice to OUTOFservice;
3, choose to change the meter mode;
4, select outofservice. enter and return;
5, warm reminder to choose OK;
6, in the manualsetup select outputs used to set the positioner feedback;
7, select outputterminal;
8, select outputterminal;
9, select enable after enter;
10, be sure to select send send after the completion of the feedback using the settings. Remember to change the valve back to inservice status.
Step 3: positioner calibration button activation
1, in the manualsetup menu under the function activation;
2, function activation select send send to complete the junction box self-travel calibration button settings;
3, press the debug button 3-10 seconds seconds, the valve will automatically travel calibration valve will automatically travel calibration.
Step 4: Adjustment of sensitivity
If you find that the valve under the Fisher valve positioner has vibration, or the valve action is too slow, you can improve the adjustment of TuningSet (simply understood as sensitivity), click send to send.
CDEFGHIJKLM” can be selected, C valve response *** slow, M valve response *** fast, the faster the response is more likely to lead to shock.
Step 5: InstrumentMode setting
In the positioner calibration in the positioner calibration, parameter adjustment, parameter adjustment, generally need to InstrumentMode placed in the OutOfService (or NotInService) state, calibration, adjustment must be put into InService after completion!
Above is the use of Rosemount 475 hand manipulator for debugging steps, in addition to 475 hand manipulator, with hart or current signal debugger can be debugged.
2, DVC2000 debugging
Fisher FisherDVC2000 digital valve controller components of the bulk of the composition (from the outside to the inside in order y): shell with a glass window, EMI protective cover, the main board with LCD and touch buttons, amplifier key, integrated block components, I / P converter, terminals and sensor components, exhaust holes, shell.
1, first remove the shell, then wiring, then turn on the current generator power supply to feed 4mA ~ 20mA current signal, so that the LCD display open, and then language selection.
Operation method: Press and hold the four keys up and down, left and right at the same time for 3 seconds, then use the up and down keys to select the language you need among the seven languages. After that, press the right key to confirm.
2、Then set the parameters according to whether the actuator of the valve is air-open or air-closed.
Operation method: Press the down key to find the “Detailed Settings” option, and then press the right key to confirm to enter if the valve actuator is:
If the actuator of the valve body is: air-open type (FC): press the right key to find the item of “zero control signal”, then press the up and down keys to select “valve closed” and press the right key to confirm. Then press the right key to find “travel transmitter output 4mA” item, press the up and down keys to select “valve closed” and press the right key to confirm.
Air Closed (FO): Press right button to find “Zero Control Signal”, then press up and down button to select “Valve Open”, press right button to confirm. Press right button again to find the item of “travel transmitter output 4mA”, press up and down button to select “valve off” and press right button to confirm.
3、Travel automatic calibration setting
Operation method: Press the down key to find “travel calibration” item, press the right key to confirm entry, and then press the up and down keys to select “automatic” press the right key to confirm, the LCD displays “press the right key for 3 seconds, the valve will act! “Then follow its prompt operation, it can automatically search the whole trip 0%, 100%, 50%. After completion, press the right button to confirm.
Note: You can't quit the searching process, press any key will not work, you have to wait for the whole trip.
Rectification set gain code (C ~ M), C when the valve action *** slow, M when the valve action *** fast. Select the appropriate one, generally set to “L”, subject to the valve not oscillating.
Operation method:
Press the down key to find the item of “calibration”, press the right button to confirm the entry, and then press the up and down keys to select “automatic”, press the right button to confirm, the LCD displays “press the right button for 3 seconds, the valve will be acted on” and then According to its prompt operation, enter the automatic adjustment, and then wait, after completion, press the right button to confirm.
In the future, when the valve oscillation occurs in the use of the valve, then select “manual” and press the right button to confirm, the LCD will display “press the right button for 3 seconds, the valve will be actuated” and then follow its prompts to operate, to modify the setting value (gain code), until the valve does not oscillate.
Third, Fisher positioner selection
1, model characteristics
Fisher DVC6200 digital valve positioner features:
1. High-performance linkage-free feedback system eliminates the need for direct contact, thus eliminating component wear.
2. Performs a partial stroke test to detect valve failure without interrupting the process.
3. Fully encapsulated electronics resist vibration, high temperatures, and corrosive environments.
4. Able to respond quickly to significant step changes and **** control minor set point changes.
5.The DVC6200f is a FOUNDATION fieldbus communication device that can access information from any device in the network segment. This flexibility reduces the risk of exposure to hazardous environments and enables easy access to the condition of valves installed in hard-to-reach locations.
6. The modular design allows for the replacement of critical work components without the need to disassemble field wiring or pneumatic piping.
7. If installed in an integrated control system, significant savings in hardware costs and installation costs can be realized.
8. Self-diagnostic capability provides assessment of valve performance and operating conditions.
9. Digital communication enables easy access to valve operating conditions.
Fisher DVC2000 digital valve positioner features:
1. Easy to install linkage-free feedback system. a basic function of the DVC2000 series is to provide the user with a field interface that allows the user to configure, calibrate and adjust the instrument.
2. Years of experience in the control industry has brought the reliability of this product line to a new level.
3. The two-stage positioner design provides an excellent mechanical platform that allows the valve to respond to small input changes for tighter process control.
4. Using ValveLink software, tests can be performed to identify problems throughout the control valve assembly, which helps to accurately identify problems without interrupting the process and avoid equipment failure.
5. An I/O option package is available that includes two integral limit switches and a stem position transmitter.
6. Available in a compact size with an LCD display.
7. One-piece mounting is available for FisherGX, 657 and 667 size i actuators.
2, model differentiation
DVC6200 and DVC2000 have the following types:
DVC2000 without feedback HC
DVC2000 with feedback HC
DVC6200 single acting without feedback HC
DVC6200 single acting with feedback HC
DVC6200 double acting without feedback HC
DVC6200 double acting with feedback HC
DVC2000 without feedback PD
DVC2000 with feedback PD
DVC6200 single acting without feedback PD
DVC6200 single acting with feedback PD
DVC6200 Double acting without feedback PD
DVC6200 Double acting with feedback PD
DVC6200
FISHER Valve Positioners DVC6000 series are communicative, microprocessor-based instruments that convert electrical signals into pneumatic signals.
In addition to the traditional function of converting electrical signals to pneumatic signals, the DVC6000 Series FISHER Valve Positioner provides easy access to information critical to process operation using the HART communication protocol.
This can be accomplished with a Type 375 communicator near the valve or at the field junction box, a personal computer in the control room, or the system operator's console. Utilizing the HART communication protocol allows information to be integrated into the control system or captured on an individual loop basis.
DVC6000 series FISHER valve positioners are available for single-acting or double-acting actuators. The valve positioner receives feedback on the valve travel position as well as the supply air pressure and the pneumatic pressure of the actuator. This enables the instrument to diagnose not only itself but also the valves and actuators it is fitted to. Providing us with economical and effective maintenance information allows us to make the necessary repairs to the instrument and valves as soon as they are actually needed.
Wiring is economical because the FISHER Valve Positioner DVC6000 Series is powered by a 2-wire 4-20mA loop. The stage is set for cost-effective replacement of existing analog instruments.
The 2-wire design feature of the FISHER valve positioner DVC6000 series avoids costly separate laying of supply and signal lines.
DVC2000
The FISHER valve positioner DVC2000 series is simple to use, compact and easy to install. It converts a 4-20mA input signal into a pneumatic output signal for driving the control valve actuator.
The instrument is set up using a push button and liquid crystal display (LCD) interface. The LCD is located inside a protective cover so that it is not affected by the environment. This LCD interface supports multiple languages including German, French, Italian, Spanish, Chinese, Japanese, and English.
The DVC2000 series FISHER positioners utilize a two-stage positioner design. A preamplifier provides high static gain to respond to small changes in the input signal (0.125% or less). The power amplifier delivers enough air to the actuator to give the unit excellent dynamic performance with low steady-state air consumption.
The high performance non-contact valve position feedback system avoids direct contact between the valve stem and the positioner. This results in no wear and tear of parts and therefore a large operating life.
In addition, the absence of connecting rods and connections reduces the number of mounting parts and the complexity of installation. Replacement and maintenance of the positioner is greatly simplified because the feedback parts are retained on the actuator pushrod.
Designed to meet the requirements of intrinsic safety and non-sparking, the FISHER valve positioners DVC2000 series are small in size, offer excellent performance, and are upgradeable.
