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10.5.2 Parameter sets (controller parameters)
The parameters for the controller channels determine the control characteristics of the
respective control loop. These parameters must be adapted to the prevailing conditions
of the process for stable control behaviour. This enables each controller channel to be
adjusted to changing process conditions in order to keep the control behaviour stable.
The bset parameter settings can usually be found through self-optimisation of the
controller. However, this works only for linear processes.
For details of operating the controller, see the operating instructions 417102269,
'Controller operation' chapter.
For non-linear processes (control systems), it is recommended to set the parameters
manually.
The following table provides an overview of the parameter sets of the controller channels.
Depending on the configuration of each controller channel, only the valid parameters for
the command are active for input. Those that are unused appear in light grey, but cannot
be edited. Parameters shown in duplicate are related to the first and second controller
output.
Call: Device menuèParametersèParameter setsèControllers 1 to 4èParameter sets 1
and 2
Parameter
Proportional range 1
(Xp1)
Proportional range 2
(Xp2)
Derivative time 1 (TV1)
Derivative time 2 (TV2)
Reset time 1 (Tn1)
Reset time 2 (Tn2)
Switching period 1 (Cy1) 0 to 9999 s
Switching period 2 (Cy2)
Contact distance (Xsh)
417102279 Rev. 4-07.2023
Selection /
setting
possibility Explanation
1 Range of the regulating deviation (actual -
0 to 9999.9 ( )
nominal value), in which the output level
is proportional to the regulating deviation.
The smaller the proportional range selected,
the greater the output level change per
regulating deviation. If the proportional range
is set to a value of 0, the controller will
automatically function as a limit switch without
PID controller structure.
0 to 9999 s Influences the differential component (D
component) of the controller output signal.
The purpose of the D component is to
dampen the temporal actual value gradient,
and thus to suppress the tendency to vibrate.
The effect of the D component is stronger
with a larger derivative time.
0 to 9999 s Influences the integral component (I
component) of the controller channel. The
purpose of the I component is to minimise
remaining regulating deviations. The effect
of the I component becomes weaker with a
greater reset time.
When an output of a controller channel is
configured as a pulse width output, the period
of the switching pulses is fixed here. The
cycle time should be chosen so that the
clocked controller output signal (i.e. heating,
cooling, metering, etc.) does not give rise to
any interfering actual value fluctuations and
the relay outputs and resources driven by
them are conserved as much as possible.
1 Minimum regulating deviation from which
-0 to 999.9 ( )
switching controller outputs are active.
This is used to protect relay outputs
or connected equipment when driving
continuous controllers with pulse outputs.
For very small regulating deviations, the
switching operations of the controller output
are suppressed.
58
Default
0,0
80.0 s
350.0 s
20.0 s
0,0