Operators Handbook DCU3 – System
6., Main function „Control Loops“
BAEDCU3 - Rev. 4.6 - 0504
6 - 1
6
MAIN FUNCTION „CONTROL LOOPS“
6.1
Equipment and Functional Principles
All control loops in the DCU3 - system are DDC controllers. They operate either as PID controllers,
setpoint controllers or on/off controllers and are adapted to the related control loops. Depending on the
actuator their output is either continuous or pulsewidth-modulated (pwm). Both single- and split-range
controls are possible. The controller structure (PID) can be parametrized, if necessary. Switching over
between the operating modes is carried out with bumpless transfer.
These modes can be selected:
Mode
State of controller
off
controller switched off with defined output
auto
controller in operation
manual
manual control of controller / actuator
profile
time profile for setpoint
cascade
servo controller in cascade control loop
In the controller display you can enter actual values, operating modes and controller outputs. Effective
ranges depend on the configuration implemented for a specific fermentor. The parametrization display
for adjustment of PID parameters, output limits and deadband is accessible via a password. In remote
operation setpoint and operating mode are specified by the host computer.
The extent of implemented controllers depend on the fermentor system and/or the individual
customized configuration. The controllers shown below can be implemented at present.
Temperature controller
PID cascade controller, pwm-splitrange outputs for heating /
cooling
Stirrer controller
Setpoint controller for external motor control
pH controller
PID controller with pwm-split-range outputs for acid/base
pO
2
controller
PID cascade controller for speed, airflow or pressure servo
controller (switchable)
pO
2
gasflow ratio controller
Master controller for gasflow ratio controller
Gasflow ratio controller
Ratio controller of two external massflow controllers
pO
2
Gasmix controller
PID controller, with pwm continuous outputs for control of
N
2
/O
2
Airflow controller
Setpoint controller for external massflow controller
Foam controller
On/off controller for antifoam
Level controller
On/off controller external harvest and/or feed pump
Feedpump controller
Setpoint controller for external dosing pump
Pressure controller
PID controller, continuous output pressure control valve
Weight controller
PID controller, pwm-output for external harvest pump
Dosing controller
PID controller for control of a external dosing pump
Note: Additional or alternate controller functions can be implemented into existing DCU-systems
lateron by changing the configuration, for instance. Above this, the software allows imple-
menting of special control functions, if necessary.
Summary of Contents for DCU 3
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Page 4: ...Operators Handbook DCU3 System Introduction BAEDCU3 Rev 4 6 0504...
Page 8: ...Operators Handbook DCU3 System Contents BAEDCU3 Rev 4 6 0504...
Page 10: ...Operators Handbook DCU3 System 1 Design and Function BAEDCU3 Rev 4 6 0504 1 2...
Page 74: ...Operators Handbook DCU3 System 6 Main function Control Loops BAEDCU3 Rev 4 6 0504 6 40...
Page 80: ...Operators Handbook DCU3 System 7 Main function Batch Control BAEDCU3 Rev 4 6 0504 7 6...
Page 88: ...Operators Handbook DCU3 System 8 Main Function Recipes BAEDCU3 Rev 4 6 0504 8 8...
Page 106: ...Operators Handbook DCU3 System 9 Main function Maintenance BAEDCU3 Rev 4 6 0504 9 18...
Page 110: ...Operators Handbook DCU3 System 10 Main Function Documentation BAEDCU3 Rev 4 6 0504 10 4...
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