HF124PEN_v0501_04
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2.3.
OPERATOR INFORMATION AND FUNCTIONS
In general, the F124-P will always act at Operator level. The information displayed is dependant
upon the SETUP-settings. All pulses generated by the connected flowmeter are measured by the
F124-P in the background, whichever screen refresh rate setting is chosen. After pressing a key, the
display will be updated very quickly during a 30 second period, after which it will slow-down again.
Fig. 3: Example of display information during process.
Operation:
The IP algorithm used in the F124-P :
Only the Integral action works at a set-point change, so there is no aggressive change in the control
output even when the set-point is changed in steps. In this way the control method produces stable
control, but react not as quick as a normal PI controller.
Selection and programming Operation mode:
By pressing the PROG-button, “Control” is displayed and the following operation modes can
be selected: Hand, Local and Ratio.
After selecting a mode, the control operation is displayed at the bottom line as well as the
actual set-point.
The value is changed directly from the keyboard by using the “
” UP-button and the “
”
DOWN-button. The longer you press the button, the quicker the value change.
“Hand” mode
In this mode the control output (CO) can be manipulated directly. In the “Hand” mode,
there is no loop connection between flow A and B.
In the “hand” mode, 0% correspondents with the minimum output signal (most
applications 4mA) and 100% with the maximum output signal (20mA).
The top line displays the calculated ratio between flow A and B (flow B / flow A).
I-action
Process
P-action
Setpoint
PV
PV
-
+
RUN