Evoqua WALLACE & TIERNAN SFC, Original Instruction Manual

Page: 87 / 288

SFC
Functions
4.
87
4.7 Control parameters
Control parameters are input variables that determine the control
functions of a controller. Different parameters apply to each type
of controller.
Please note
The control parameters are listed alphabetically.
Flow rate source
This parameter is only available during single feed forward in
application 2.
This parameter switches off the flow input (off) and activates the
flow rate signal for the single feed forward (factory setting = flow
measurement) as control variable.
For quantity-proportional dosing, the parameter must be set to
„Flow Measurement“.
Flow rate direction
This parameter determines the direction of the flow rate signal
directly proportional to the actuator output:
Max. pulses/min
Meaning:
Maximum number of pulses
Explanation:
The pulses max./min parameter only applies to pulse pumps.
This parameter is used to set the maximum number of pulses per
minute in accordance with the employed pump.
Setting range:
The parameter max. pulses/min. can be set to 100, 120, 140, 160
or 180 pulses.
Max.lin.Corr
This parameter monitors changes to already learned dosing
factors.
If new dosing factor changes are learned, which are larger than the
max. linearity correction, this dosing factor is used for all values in
the dosing curve = > initialization of the curve.
direct = Flow rate input signal directly proportional to
the positioner output (factory setting)
inverse = 1 flow rate input signal
Example: 0 – 100 % flow rate = 0 – 20 mA (direct)
0 – 100 % flow rate = 20 – 0 mA (inverse)