Bronkhorst®
Instruction Manual mini CORI-FLOW ML120
9.17.097G
55
The following digital parameters are involved in the filtering and minimum capacity settings:
Name
Process/
Parameter
Modbus
register no
Value
Purpose/Remarks
Dynamic Display Factor
(56)
117/1
62729…
62730
1
disable filter
Static Display Factor (57)
117/2
62737…
62738
1
disable filter
Sensor Exponential
Smoothing Filter (74)
117/4
62753…
62754
1
disable filter
Capacity Minimum (247)
1/27
33241…
33242
as required typical value (for mini CORI-FLOW ML120): 5 g/h
5.3.5
Proportional control settings
Adjusting flow range
A proportional control valve enables re-scaling of the controllable flow range, making it possible to dose with a lower flow.
This increases the running time of the batch (especially in the linear phase; see
Dosing principle - Dosing principle
), but also
provides higher accuracy. To minimize batch size overshoot, the flow can be reduced further when nearing the configured
batch size (control gain phase).
To change the maximum capacity in FlowPlot, return to the
Basic
tab of the
Instrument Settings
function and edit the
Full
scale
value. In the plotting area of the main screen, this value
is translated to 100%.
The starting point of the control gain phase is determined by the value of
Counter control gain
. From the start of the
controller gain phase, the valve is closed gradually (or the pump speed lowered), until the configured batch size is reached.
The required value can be calculated with the following formula:
delivered
batch
of
Percentage
100%
100%
gain
control
Counter
-
=
The table below shows some example values:
Percentage
delivered
Counter control gain
0%
1
50%
2
75%
4
longer dosing time,
80%
5
less overshoot
90%
10 (default)
•
95%
20
shorter dosing time,
98%
50
more overshoot
99%
100
If the value is set to 0, control gain is disabled. Essentially, this
turns proportional control into on/off control.
In FlowPlot, the input location of
Counter control gain
can be
found on the
Alarm & Count
tab of the
Instrument Settings
.
