Operators Handbook DCU3 – System
6., Main function „Control Loops“
BAEDCU3 - Rev. 4.6 - 0504 6 - 8
6.5.2 Operating Display for Servo Controller (Jacket 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.
6.5.3 Operation
For routine adjustment of setpoint and operating mode only the master controller [TEMP]
must be operated. Direct manual adjustment of the heating and cooling system is possible
at the servo controller [JTEMP], when it is switched over into „manual“ mode.
For test purposes it is possible to split the cascade control and specify a setpoint for the
jacket temperature in „auto“ mode via the servo controller [JTEMP].
6.5.4 Special Notes
When the master controller is in „auto“ or „profile“ mode, the servo controller is automatically
switched over into „cascade“ mode. When the master controller is in „off“ mode, the servo
controller is also automatically switched to „off“ mode.
The servo controller cannot be operated with time profiles. A setpoint limit for the servo con-
troller can be parametrized via the MAX output limit of the master controller, for instance:
– BIOSTAT
®
MD: MAX = 63,3 [%] (corresponding to 95 °C, for prevention of excessive
jacket temperature during the process)
– BIOSTAT
®
ED and UD: MAX = 98,3 [%] (corresponding to 147 °C; for prevention of
overheating during sterilization)
For the default output limits of your fermentor system, see the configuration documentation
delivered extra. As a general guideline, the output limits for autoclaveable fermentors may
be preset like the BIOSTAT
®
MD, the limits for insitu-sterilizable fermentors may be preset
like the BIOSTAT
®
ED.
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