MFC
Functions
4.
83
Behavior in operation
Operation after a flow rate change:
The single feed back control remains switched off (Ypi stop
function) during the disturbance variables (flow rate change,
positioner running time, dead time from line lengths). This
maintains a stable control, which means the control operates with
the dosing factor from the dosing factor table applicable for the
new flow rate.
The time the single feed back control is switched off is determined
by the fuzzy module and is therefore variable ("PI" display in
seconds).
A larger change in the setpoint deletes all learning meters, in order
to reinitialise the dosing rate curve when the setpoint is reached.
However, the learned dosing factors remain initially unchanged.
Inactivated flow rate values are automatically preassigned a
dosing factor.
The single feed back control is always active.
Control deviations that occur are quickly offset by the PI single
feed back control during continuous flow.
A positive jump in the flow rate causes a brief drop below the
setpoint due to the running time of the positioner and the dosing
delay. Therefore, the PI controller freezes for a brief period ("PI"
display in seconds).
A negative jump in the flow rate causes the setpoint to be briefly
exceeded due to the running time of the positioner and the dosing
delay. Therefore, the PI controller freezes for a brief period ("PI"
display in seconds).
The PI controller is not deactivated if the flow rate is continuously
rising or falling if the dosing rate can quickly adjust to these
changes. This is true of fast positioner running times and loops
without dosing delay.
Содержание WALLACE & TIERNAN MFC
Страница 1: ...WALLACE TIERNAN MULTI FUNCTION CONTROLLER MFC from version V 2 00 INSTRUCTION MANUAL...
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Страница 6: ...6 WT 050 580 000 DE IM 0714 Introduction MFC 1...
Страница 40: ...40 WT 050 580 000 DE IM 0714 Description MFC 3...
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Страница 233: ...MFC Complete Devices Retrofit Kits and Spare Parts 8 233 VariaSens drawing non pressurised version W3T158742 W3T158742...
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Страница 247: ...MFC Certificates 10 247 10 Certificates...
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Страница 262: ...262 WT 050 580 000 DE IM 0714 Settings table MFC 11...
Страница 266: ...266 WT 050 580 000 DE IM 0714 Index MFC 12...