Contrec 515 BR03, Operation Manual

Page: 39 / 110

Operation
515 BR03 - 15 August 2021 29
Ratio Mode The desired process ratio set point
(RATIO %) is set via the front panel or
serial communications.
The PI controlled output signal is used to
maintain the desired process flowrate via the
proportional control valve.
The desired process flow is determined as a
ratio of the main flow (0 to 400% range) i.e.
Blend-1 Mode The desired blending ratio set point
(RATIO %) is set via the front panel or
serial communications.
The PI controlled output signal is used to
maintain the desired process flowrate via the
proportional control valve.
The desired process flow is determined as a
ratio of the net (combined) flow (0 to 80%
range). i.e.
Blend-2 Mode The desired blending ratio set point
(RATIO %) is set via the front panel or
serial communications.
The PI controlled output signal is used to
maintain the desired process flowrate via the
proportional control valve.
The desired process flow is determined as a
ratio of the main (net) flow (0 to 80%
range). i.e.
Main Flow
Proportional
Control Valve
Frequency
Input 1
Process Flow
Flowmeters
Analog
Output
Frequency
Input 2
Ratio
%
P
flow
M
flow
-------------- 100

=
Main Flow
Proportional
Control Valve
Frequency
Input 1
Process Flow
Flowmeters
Analog
Output
Frequency
Input 2
Ratio
%
P
flow
M
flow
P
flow
+
---------------------------------- 100

=
Main Flow
Proportional
Control Valve
Frequency
Input 1
Process Flow
Process
Analog
Output
Frequency
Input 2
Flowmeter
Main
Flowmeter
Ratio
%
P
flow
M
flow
-------------- 100

=