ABB ECA06 Configuration And Installation page 138

3.6 Setting the Configuration
The controller can be configured to perform different types of control:
• PID control with fixed parameters. If the process has dynamic characteristics
• Gain Scheduling PID control. If the process involves a non-linear valve or
• pPI controller, predicting PI (ECA600 only), which is a dead-time
• Feed Forward control. To eliminate a disturbance that could be measured
• Adaptive control. The pPI controller cannot be used with adaptive control.
The Autotuner function can be used to set the PID parameters for all types of
control but not for the pPI controller. If adaptive control is selected, the PID
parameters are only used as starting values.
The selected control type can be used with direct or reversed control action.
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which are independent of the working point (a linear process) and do not
change with time, PID control with fixed parameters may be used.
other type of non-linear device the process dynamics will change according to
the working range. The controller should therefore also have different
parameters in different working ranges. If the non-linearity can be related to a
reference signal, Gain Scheduling PID control may be used. This can also be
combined with adaptive control.
compensating controller. The pPI controller gives short damping-time at a load
or set point change. Instead of using the Autotuner, the pPI controller has three
parameters to be set: gain, integration time and dead-time. This controller
should not be used for integrating processes.
before it affects the Process Value use feed forward via the selected input. In
order to eliminate measurable levels of disturbance, adaptive or static feed-
forward can be used.
PID control with adaptive PID settings. If the process has variable dynamic
characteristics which cannot be related to a reference signal, PID control with
adaptive PID settings should be used. (ECA600 only)
Chapter 3: Configuration
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