If the proportional range selected is too small, the P-component of the
actuating signal remains at 100 % for a long time. This value decreases even
faster within the proportional range, i.e. the actuating signal decreases rapidly
and the progress of the actual value towards the target value comes almost
to a complete stop. The I-component, which only becomes eective now,
causes the actual value to move slowly towards the target value.
In the case shown here, the preset I-component is too large (parameter
Tn too small, Tn must be increased). The I-component integrates the
control deviation until it becomes 0. If integration proceeds too rapidly,
the actuating signal, i.e. the output signal of the controller, is too large.
As a result, the actual value fluctuates (fading) around the target value.
The hold-back time (parameter Tv) should be adapted using the formula:
Tv = Tn x 0.75.
The actual value increases relatively sharply towards the specified target
value. The proportional area settings seem to be correct. If the control devi-
ation becomes smaller, the actual value approaches the target value much
more slowly. The integration component (I-component) must compensate
for the drastic reduction of the proportional component (P-component). In
this case, the I-component is integrated too slowly. The parameter Tn, which
specifies the integration interval, must therefore be reduced. The hold-back
time (parameter Tv) should be adapted using the formula: Tv = Tn x 0.75.
6.8.2 Overview of internal control parameters
The internal control compares the set temperature T
set
with the bath tem-
perature T
int
and calculates the actuating signal, i.e. the measurement used
for heating or cooling.
Fig. 62: Control parameter Xp too small
Fig. 63: Control parameters Tn and Tv too
small
Fig. 64: Control parameters Tn and Tv too
large
V6 PRO bath thermostats and circulation thermostats 99 / 156
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