Operators Handbook DCU3 – System
6., Main function „Control Loops“
BAEDCU3 - Rev. 4.6 - 0504 6 - 7
6.5 Temperature Controller
The temperature is controlled via a cascade control with a master controller for the vessel temperature
and a servo controller for the jacket temperature. The output of the servo controller controls the steam
valve (or an electric heater) and the cooling valve in split-range operation via pulsewidth-modulated or
continuous outputs.
The master controller can be switched from PD-behavior at start-up to PID when approaching the set-
point, which minimizes overshooting. When the temperature controller is switched off, an additional
digital output switches off the circulation pump and the heating contactor in the fermentor.
The temperature control is operated via the displays for the master controller [TEMP] and the servo
controller [JTEMP]. However, since all operations for the servo controller are activated automatically,
the adjustment of setpoints and operating modes need only be carried out at the master controller.
6.5.1 Operating Display for Master Controller (Vessel Temperature)
For a description of the tags, the physical units or entries, the displayed value or function
and of the required inputs see the table in section 6.3, Controller Operation in General.
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