10.2.4
Block 3: Setting PID parameters
Whenever an automated process step requires control of flow, the UNICORN control
software employs PID-type controllers (see
Section 14.5 PID control, on page 214
). PID
parameters are optimized to fit different column diameters. The default settings for the
parameters are:
D
I
P
Column volume
0
25
0.3
1 l
0
25
0.3
2.5 l
0
15
0.3
10 l
1
0
10
0.5
20 l
1
1
ÄKTA ready High Flow Kits should be used for columns of 10 l or more.
These settings provide fast response and robust control for most operating situations.
Action
Step
Create a new block for setting of PID parameters. Name the block
MyPIDPa-
rameters
and set Time as its base.
1
Insert the FlowTune instruction into the block. This instruction has the re-
quired fields for setting PID parameters.
2
There are six parameters in total, three each for the High Flow Kit and the Low
Flow Kit. When running the method, only those parameters relevant for the
flow kit installed are used.
Note:
The PID_Parameters block is a simple block,
with the main content being the FlowTune in-
struction. Apart from this, the block only con-
tains the required Base and End_Block.
ÄKTA ready Operating Instructions 28960345 AD
157
10 Creating a method
10.2 An example of using the Method Editor
10.2.4 Block 3: Setting PID parameters
