DVC6000 valve positioner
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I would like to ask: after the DVC6000 valve positioner has completed its travel distance using the handheld operator, can a signal be sent via this handheld operator – specifically a 4-20mA signal – to see how the valve responds? It’s not necessary to use signals from the control room; operation can be carried out with the handheld operator. If this is possible, what are the specific steps for operating it using the handheld operator? Thank you all.
No. Since Hart communicates using a sine signal of a certain frequency superimposed on the 4-20ma signal (or power supply), the positive and negative half-cycles cancel each other out, having no effect on the 4-20ma signal (or power supply). A loop calibrator can be used to apply a 4-20ma current to observe the valve operation.
What type of hand controller are you using? 375? Shift to MA gear at 375 and give a signal.
I’ve also been thinking about this: is it possible to use a 375 unit on-site to adjust the valve position with a 4-20ma signal? Could the person upstairs explain it in more detail?/
Does the 375 have a MA mode? I think there’s only one circuit testing function; you’re using a process verification instrument, right? After the DVC6000 completes its stroke, it’s not possible to use the 375 to send signals – you need to use a process verification instrument or a signal generator instead
Sure, that’s possible. The DVC6000, when communicating via 375, has a manual setting that allows adjustment of the valve’s stroke distance. There is also a function that allows entering instrument mode via a hotkey, and it enables the addition of a 4-20mA signal; I’ve forgotten the specific steps. Try using 375. I’ve added them