Sartorius DCU 3, Operator'S Handbook Manual

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Operators Handbook DCU3 – System
6., Main function „Control Loops“
BAEDCU3 - Rev. 4.6 - 0504 6 - 34
6.21.2 Operation
We recommend to prepare a scheme of the intended profile with all break points and the
corresponding setpoints (see example below). The breakpoints of the scheme will give you
the time settings and setpoints, which must be programmed.
A profile must have at least one breakpoint with a time different from zero. Otherwise the
profile cannot be started.
6.21.3 Special Notes
When the setpoint profile is started the controller mode in the main menu CONTROL
LOOPS is automatically switched over to „profile“.
If the time for the first breakpoint is not set to „00:00 h:m“ the system uses the current set-
point for the start of a profile.
In a program for a setpoint jump two setpoints can have the same time.
When a profile is defined and started for pO
2
-control, correlating active profiles for „STIRR“,
„AIR“ or „PRESS“ will be stopped automatically. The controller will be switched over to „cas-
cade“-mode.
Depending on the selected control principle (CONTR) the setpoint profile of the Gasflow-
Ratio - controller is to be set for the total flowrate (TOTAL) or to the ratio of Gas 1 (RATIO).