Evoqua WALLACE & TIERNAN SFC, Original Instruction Manual

Page: 91 / 288

SFC
Functions
4.
91
Tu
Meaning:
Loop dead time
Display:
Seconds (s)
Explanation:
Time required between dosing start and clear recognition of the
rise in the control variable
Setting range:
The parameter Tu can be set from 1 s – 59 min 59s.
Please note
If the values Tu and Ts are manually modified, the control
parameters Xp and Tn are re-calculated.
Tvar
Defines the variable dead time in the compound loop. The time to
be entered is based on 100 % flow rate (for the calculation, see
4.5.2.3 “Compound loop with process measurement”).
Ty
Meaning:
Running time of the positioner
Display:
Seconds (s)
Explanation:
The parameter Ty only applies to positioners.
Ty is the time which the positioner requires to adjust from 0 % to
100 %.
Setting range:
The parameter Ty can be set from 10 – 180 s.
X factor
This parameter is only available during single feed forward, control
variable 2 = measured value X.
Determines an adjustment factor, how strongly the measured
value influences the actuator output (factory setting 1.0).