Does the Siemens positioner malfunction after the cover is put on?
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There is a valve of type FO on site, equipped with a Siemens positioner that sets the opening degree. As soon as the cover of the positioner is tightened, the valve starts to move in the closing direction; once the cover is loosened, it operates normally again. What is the reason for this? Has anyone encountered it?
Check the wiring. There’s not much to say – there must be a problem with the wiring inside the locator. It mainly involves checking whether the connections are secure and whether the wire cores are damaged, etc.
It’s likely there’s a problem with the wiring inside the locator, or there’s a fault in the circuit board located under the control panel. When tightening the screws to close the cover, it’s inevitable that the interior of the locator will be compressed
A failure only occurs when the cover is not properly sealed; it is usually a mechanical issue, not a circuit or electrical problem. It is possible that, during the tightening of the cover, significant compression is exerted on the internal electrical circuit boards, wiring terminals, or movable mechanical components, or deformation is induced by stress, which in turn causes the electrical system to send incorrect signals and perform erroneous actions. Try adding a thicker washer to this cover; this might create some clearance in the areas where compression or stress occurs, thereby eliminating this issue.
Big bro, the vent hole on your locator is clogged; just make a hole in it quickly.
There’s a problem with the wiring; it should be turned on, FO
I’ve encountered this issue: when a switching power supply is used to power the flow meter, if the cover is tightened too much, power is cut off and no display is shown; a multimeter also fails to detect any voltage. It was resolved by pushing the two power cables in a little further.
It is recommended to check whether the locator circuit board is intact; it’s likely that there is a problem with the circuit board.
Could my experience be inspiring to everyone? A certain imported brand features a float based on the Bourdon tube principle, mounted on the side; simply by loosening or tightening the cover of the float, the zero point shifts significantly! Later, upon disassembly, it became clear that the compression mechanism triggered the piezoelectric sensor—the core signal conversion module of the spring tube measurement principle float!