ECOLAB Versatronic Kurz- Betriebsanleitung Seite 85

9.5.2 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. So that conditions can be changed for each
controller channel to be adapted in order to keep the control performance stable.
The best parameter settings can usually be found by the automatically adjusting the
controller. However, this only works for linear processes.
For operating the controller, see operating instructions 417102269, section 8.4 Using the
controller.
For nonlinear 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. Those that are unused appear light grey, but cannot be edited.
Two duplicate parameters are related to the first and second controller output.
Go to: Device menu è Settings è Parameter sets è Controllers 1 to 4 è Parameter
sets 1 and 2
Parameter
Proportional band 1 (Xp1)
Proportional band 2 (Xp2)
Derivative time 1 (Tv1)
Derivative time 2 (TV2)
Reset time 1 (Tn1)
Reset time 2 (Tn2)
Switching period 1 (Cy1)
Switching period 2 (Cy2)
Contact distance (Xsh)
Hysteresis 1 (Xd1)
Hysteresis 2 (Xd2)
Selection /
option Explanation
) Range of the control error (actual - set point), in
0 to 9999.9 ( 1
which the output level is proportional to the
control deviation. The smaller the proportional
range is selected, the greater the output ratio
change per deviation. If the proportional band 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 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 steady-state error. The
effect of the I component becomes weaker with
greater reset time.
0 to 9999 s 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, on the one hand by the
clocked controller output signal (i.e. heating,
cooling, metering, etc.) no interfering actual value
fluctuations arise, and on the other hand, the
switching outputs thereof and driven resources
are conserved as possible.
-0 to 999.9 (1) Minimum of deviation from which switching
controller outputs are active. It is used for the
protection of switching outputs or connected
equipment when driving continuous controllers
with pulse outputs. For very small deviations, the
switching operations of the controller output are
suppressed.
The operating distance between the output states
0 to 999.9 (1)
(on / off) for switching controllers
(Proportional range = 0) The switching should be
selected so that the actual value will not vary
greatly from the output of the switching controller;
on the other hand, the switching outputs and
which controlled resources are conserved as
possible.
41
Device menu
Default
0,0
80.0 s
350.0 s
20.0 s
0,0
0,0
417102279 Version 1-09.2019