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How to eliminate glitches or false signal?

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Maikky:
Dear John.

The filter is normally used to smooth a signal and reduce ripples and peaks.
The "degree" of smoothing is set by the parameter TG (recovery time).
Additionally there is a parameter KP (proportional gain), which should be set
to 100.
 
In your case with a rising and - during that time - relatively smooth signal you
may set TG to the lowest value TG = 1 with the smallest delay between original
and smoothed signal.
At "pump stop" you should set TG to 0 for 3 seconds. A value of 0 freezes the
output to the last input.

As a second option you may use the value limitation function block VC.
If you set the upper limit value SH, all inputs larger than SH will create an output
of the upper limit.

Regards
Maikky
     

John_Ess:

--- Zitat von: Maikky am April 14, 2014, 10:15:46 Vormittag ---
At "pump stop" you should set TG to 0 for 3 seconds. ..

    

--- Ende Zitat ---

So can I simply set the "recovery time" value TG=30 (for 3 seconds delay) instead?
Are you sure about setting TG = 0 ?

Maikky:
Dear John.

From your earlier statements I assumed, that you do not need a signal for the 3 seconds,
where the peaks occur. For this scenario a value of 0 at parameter TG is freezing the last
input value.

Now I understand, that you need the input for a high alarm observation so forget the earlier
recommendation with value 0 or with function block VC. This will not work.

You still may use the smoothing filter but you have to "play" a little with the parameter TG.
The impact of this parameter is not directly predictable. A higher value results in a smoother
and more delayed output, a lower value results in a more rippled and shorter delayed output.

If you have an input signal which jumps from 0% to 100% a TG value of 30 means, that
the output will reach 63% after 3 seconds. This is predictable but you will not have such
inputs in reality.

A second option to do your high alarm observation is to use an on-delayed timing relay.
If the input signal is higher than the set point for more than 3 seconds it will cause an alarm.

Regards
Maikky

John_Ess:

--- Zitat von: Maikky am April 16, 2014, 17:58:58 Nachmittag ---
A second option to do your high alarm observation is to use an on-delayed timing relay.
If the input signal is higher than the set point for more than 3 seconds it will cause an alarm.


--- Ende Zitat ---

Thanks Maikky, something like this - right?

Maikky:
Dear John.

This solution will work.

Regards
Maikky

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