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ControlMaster CM30, CM50 and CMF310
Universal process controllers,
1
/
4
,
1
/
2
DIN and fieldmount
7 Advanced Level
52
IM/CM/ED–EN Rev. X
…Control / …Loop 1 (2) Control / …FeedForward
Mode
Off
Feedforward control is disabled.
Static Gain
Gain applied by
FeedForward
block is a fixed value set by the user.
Adaptive Gain
Gain applied by the
FeedForward
block is set by the controller automatically.
Adaptive
feedforward can be used even if
Adaptive Control
(see page 52) has not been enabled. For
Adaptive
feedforward to operate, the system must first be tuned using
Aututune
– see page
Adaptive Gain
cannot be used with output tracking or with motorized valve without
feedback.
FeedForward
(see page 51) with static gain can be used with motorized valve
without feedback.
Adaptive Gain
cannot be used with
pPI
control – see page 49.
S
ource
Used to select source of the disturbance variable (DV) – see Appendix A, page 104 for
description of sources.
Gain
Sets the gain to be used when in
Static Gain
mode.
In
Adaptive Gain
mode this value is set automatically by the controller.
Reset Adaptive FF
If the controller is moved to another application,
Adaptive
feedforward must be reset.
Adaptive Control
Adaptive Control
alters the
PID
parameters automatically (see page 30) if the process changes. It monitors process
performance continuously and updates an internal process model. Based on this process model it calculates the
optimum control parameters and adapts the
PID
settings accordingly. Changes to the
PID
settings occur as soon as
the process dynamics change.
Warnings are provided if the control parameters are changed by more than a set amount. This is important to detect
conditions such as a blocked valve that could be interpreted by the adaptive controller as decreased process gain.
Run
Autotune
(see page 29) to set the initial values for the adaptive controller. In a few cases,
Autotune
may not work
well, for example in extremely noisy processes. In these cases, provide the adaptive controller with initial values of
Critical Period
and
Critical Gain
by the user – see procedure below.
The adaptive controller uses the
Autotune Dynamics
setting to determine the optimum
PID
settings. If the process has
a long deadtime, or a noisy measuring signal, select
Deadtime
or
PI
at the
Dynamics
parameter – see page 30.
The adaptive controller does not work with Motorized Valve without Feedback output types – see Appendix D, page
109.
Adaptive Control
cannot be used if output tracking mode
In Auto
is set (see page 56) because the adaptive controller
receives false information.