Oreca

 Goodmorning!

I assume you have connected a readback value to input Rbk? It does not matter if the signal is simulated by an input word or it is a direct connection to output MV. But it could be that the readback signal is delayed too much. The MonTiDynamic value is default set by 3sec, meaning the readback value should have the MV output value within 3 seconds (A hysterese is available as well so that Rbk does not have to be exactly the same as MV value.

The PosDiOpen en PosDiClose variables are important too, because they will say to the valve that the end position is reached....The MV must be >= than PosDiOpen + Feedback open must be present. The same goes for PosDiClose, where MV must be <= PosDiClose + Feedback close.

If you don't want to use FbkOpen and Close, you can set NoFbkOpen and NoFbkClose at "1", meaning the digital feedback signals are not used.

If you still have problems, please post a screenshot and I'll take a look at it.

Programming Lover

Mr oreca i have used vlvanl but i am getting two errors continuously one error is "End Position Error" and the other error i get is after entering var value i get "control error". How to remove these errors moreover can you please explain what is this var? Thanks

 Hi Mr. Oreca,

If the valve is operating on range of POSDiClose e.g. POSDiClose = 0.5, MV = 0.5,  Rbk = 0.8 and PosDeadBand = 3.0 then the PosDeadBand dosent works, it gives the control error for Valve.

what is the probable solution in this case

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