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adamlhadi

reverse PID action

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Hi everyone
 
currently am working on (PID level control) on factory I/O
 
am using 2* PIDs for filling and discharging.in the filling process everything works great even whene activating MAN (manual mode)
 
with the discharge process i have set the following parameters as follows (picture) ,this allows to invert the PID action
 
but whene i set the MAN value to 90% the LMN=10 if MAN=80% the=20  it's like he is Completing to 100%

how to solve it

 

kind regards

Capture.PNG

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Sounds like instead of inverting the action, you inverted the output, your loop is now set up to control a fail open valve instead of a fail closed valve.

Not sure about the Cont_C block, but in other Siemens platforms, setting the gain to a negative value inverts the control action, (direct or reverse).

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