Maintenance methods to enhance the efficiency of Siemens positioners
Thread Content
There are many faults caused by Siemens positioners: such as unintended drift of the feedback signal, slow closure of the control valve, failure of the control valve to operate, and fluctuations in the valve performance. This is especially evident in situations with high-frequency actions such as PSA, and then the positioner is replaced. But in applications where the failure rate is high, bulk production is obviously not pleasing to the management. Therefore, it is highly necessary to find ways to achieve comprehensive preventive maintenance at lower repair costs. (Detailed explanation inside the building due to limited space in the main text)
Based on the structure of the locator, we can see that it consists of a main board, piezoelectric valves, a dial, feedback resistors, and a housing. There are also various boards such as the feedback signal board and the limit signal board. Upon careful consideration of all the faults that occur, it turns out that they are all caused by two moving components in the locator – namely the piezoelectric valves and the feedback potentiometers! After the piezoelectric valve has been in operation for a long time, the diaphragm, springs, and other components inside it become fatigued ； The feedback resistor wears out and oxidizes in an air environment. And there are almost never any problems with the circuit boards and the casing! After identifying the problem, we simply needed to replace the piezoelectric valve and the feedback resistor, and that resolved the issue – with **cost savings** and **time savings** as well! There is also an additional small skill: after replacing the piezoelectric valve or the feedback resistor, it isn’t necessary to replace the main board, as the initialization data of the positioner for the control valve remains unchanged. Therefore, it’s sufficient to use the dial to set the opening degree of the current valve – no initialization is required before using the control valve~~~! This curve-based approach enables official online replacement of the locator; the official method requires communication devices to transmit data, but this approach does not need them!
How much do Siemens positioners cost? Are piezoelectric valves that expensive?
It is common for the feedback signal to drift without any apparent reason; how to fix it?
Isn’t the new locator only 3,000 yuan? It’s available for sale on Taobao
Is this locator installed on a rotary valve?
Everything is cheap on Taobao! I guess Pduoduo is cheaper: lol, the products on Taobao are all of inferior quality. So the price is definitely not ordinary! With shopping on Taobao, how should the company’s accounts be handled? ! Small companies are easy to manage, but large companies aren’t!