The hottest online replacement of Siemens intellig

2022-09-22
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Replace Siemens intelligent valve positioner

in the process industry, the operation of the regulating valve should ensure the safe, reliable and stable operation of the process unit. In the maintenance of the regulating valve, the instrument engineer often needs to replace the valve positioner. In this case, some users open the bypass and then replace the valve positioner; Some simply cut off the process logistics; In some important control loops, shutdown may be required; Such operation not only affects the software, but also affects the normal operation of the process device in which the user sets relevant safety parameters according to the experimental items and requirements, and the loss is large, some as high as one million. Can a better operation mode be adopted to replace the valve positioner? Siemens intelligent valve positioner can realize the above functions, that is, replace the valve positioner when the regulating valve remains in the normal operating position, so as to minimize the impact and loss of this maintenance on the operation of the process unit

Siemens intelligent valve positioner can realize the function of replacement

1) the position feedback of Siemens intelligent valve positioner is realized through potentiometers. The lower limit and upper limit of the potentiometer are 0 and 100 respectively. Under normal working conditions, the lower working limit (P0) and the upper working limit (P100) of the potentiometer are between the two, such as the zero point (0%) and full stroke (100%) of a linear characteristic regulating valve. The value of the potentiometer may be p0=20.5 (corresponding to the zero point of the regulating valve 0%) to p100=80.4 (corresponding to the full stroke of the regulating valve 100%). According to the potentiometer value under a certain working condition, the microprocessor of the intelligent valve positioner (CPU modern airliners such as Airbus A350XWB adopt a large number of carbon fiber reinforced composites) can calculate the current actual regulating valve position and display it on the liquid crystal display (LCD) of the intelligent valve positioner

The values of

p0 and P100 can be read in the parameter table of the fault diagnosis function. The operation method is to press and hold the three operation keys under the LCD screen at the same time for more than 5 seconds, enter the fault diagnosis function menu, and turn the page with the leftmost key to read the values of P0 and P100

the value of potentiometer can be changed by adjusting the wheel

adjusting wheel

2) siemens intelligent valve positioner supports intelligent communication, including HART communication, PROFIBUS bus communication and foundation fieldbus communication. Through communication, all parameter data initialized by the intelligent positioner (pulse width, up and down travel time, etc.) can be uploaded to the system and saved

through HART communication, the data in the intelligent valve positioner can be uploaded to the control system, notebook, or Hart manual operator. On the contrary, these data can also be downloaded to the intelligent valve positioner on site

through PROFIBUS communication, the data in the locator can be uploaded to the control system, notebook; Through FF communication, the data in the positioner can be uploaded to the control system or manual operator. On the contrary, these data can also be downloaded to the intelligent valve positioner on site

II. Process of replacing Siemens intelligent valve positioner

the following are the replacement steps of Siemens intelligent valve positioner based on HART communication. The replacement steps of intelligent valve positioner based on PROFIBUS and FF Bus communication can be referred to

1) obtain the data parameters of the intelligent valve positioner to be replaced

use PDM (process device manager) software to upload the parameters of the field locator to the system or notebook through HART communication; It can also be read directly with HART manual operator. If the system has saved such locator data, it is not necessary to upload it again. Next, download these parameter data to the new locator

2) fix the actuator in the current position (keep in place) mechanically or pneumatically

on site instrument engineers often use mechanical methods to fix the actuator

3) read and record the displayed value of the replaced valve positioner. If the power has been lost, record the current actual valve position

4) remove the positioner. Install all accessories on the new positioner, and then install the new positioner on the regulating valve

5) turn on the instrument signal and adjust the adjusting wheel so that the valve position displayed on the LCD of the new positioner is consistent with the recorded value

6) remove the mechanical locking device. The newly installed intelligent valve positioner can be put into operation

suggestion: the parameters of intelligent valve potentiometer can be backed up in advance in accelerating the construction of 3 Yanan port service facility system to strengthen the connection between production and demand or notebook

after replacing the new valve positioner, compared with the original valve position, the error is not more than 1%, so this method is feasible. From Siemens' worldwide service experience, we have also provided this service for users for many times

the above is a little experience in replacing Siemens intelligent valve positioner. Siemens intelligent valve positioner has more fault diagnosis functions. We hope that more users can use intelligent valve positioners to continuously improve the automation level of our national process industry, so as to create more economic benefits

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