Operators Handbook DCU3 – System
7., Main function „Batch Control“
BAEDCU3 - Rev. 4.6 - 0504 7 - 2
7.2.1 Sterilization Programs
The sterilization programs in general are phase controls. They have automatic access to digital out-
puts for valve control (max. 64 outputs), to controller setpoints and modes and to alarm parameters for
limit monitoring. The programs can be automatic sequential controls or single step controls.
7.2.1.1 Automatic Sequential Controls
Automatic sequential controls are used for the sterilization of the fermentor vessel with peripheral as-
semblies connected, for instance. The complete sterilization is a time and event driven sequential con-
trol and the individual phases are run automatically.
The required parameters, such as sterilization temperature, sterilization time and the fer-
mentation temperature after the sterilization, must be entered in the operating display.
The sterilization can also be started (and be interrupted, if necessary) via the operator ter-
minal. The display shows the running sterilization phase and the elapsed sterilization time.
If additional manual operations are necessary during the sterilization, such as opening or
closing manual valves, a corresponding message appears on the display. The automatic
sterilization will only continue after the required step is done and you have confirmed the
message via 'ACK'nowledge.
7.2.1.2 Single-step Controls
Single-step controls are necessary for the intermediate sterilization of the air inlet or exhaust filter, for
instance. You will manually activate the steps necessary for the sterilization process in the mode
„step“. The sterilization program determines the sequence of the sterilization.
Within a single-step control certain steps can be run automatically using timers, such as the
sterilization time, for instance, which must be entered in a corresponding operating display.
You will start the single-step control via the operator terminal and continue the phases via
„step“. If necessary you can interrupt the sequence. The display shows the active step and
the elapsed sterilization time (if applicable).
7.2.1.3 Status Displays during Phase Controls
For both types of phase controls the process status is displayed in the head line of the op-
erating terminal during the running process, such as „STATE: sequence“, for instance.
After the last step of the sequence (i.e. sterilization) is accomplished the operator terminal
displays the message „sterilization finished“.
To Next Page
Loading...