Evoqua WALLACE & TIERNAN MFC, Instruction Manual

Page: 77 / 268

MFC
Functions
4.
77
4.5 Controller Function
The MFC measuring and control device for the treatment of
potable and industrial water.
The following integrated control modes are available for selection:
• Single Feed Forward Control
• Single Feed Back Control
• Compound-Loop-Control
• Setpoint trim
Online measurement can be transmitted directly from the MFC
and external measuring system via mA input signal. External
control signals such as flow rate and external setpoint
are recorded using the mA/V input module. The MFC system can
record up to four main measurements and two external control
signals. In addition, measuring inputs for temperature, actuator
feedback and three digital inputs are available.
4.5.1 Single Feed Forward Control
This operating mode controls the quantity-proportional dosing of
disinfectants.
A typical application is simple flow-controlled potable water
chlorination.
Please note
This control operating mode is also available for sensor measuring
module 2 if application 3 is selected, however, only with internal
dosing factor and flow measurement from MOD 5 as control
variables. Dosing pumps, solenoid pumps or analog output
actuators with mA input for MOD2 are supported for dosing.
mg/l
6,85 705
0,00
1.00
0.43
4.00
9.00
7.00
400
pH mV
900 0,65
12:35 Kreis 1
100% 28°C MODE CAL MENU mA ?
DI
I
DI
II
DI
III
ESC
Flowsensor
control output
Dosing device
positioner, pumps
Sensors
+Temp.
Flow
sensor
Q