The picture on the left shows optimum setting of the control param-
eters.
If the Xp parameter is selected too large, the actual value reaches
the proportional range early and the P part becomes smaller than
100% of the control value. The approach to the setpoint slows
down. Thus, the simultaneously integrating I part has more time to
build up its control value portion. If the setpoint is reached, the I
part summed too much results in overshooting beyond the set-
point. If the proportional range Xp is reduced, the P part remains at
100% for longer. Therefore the actual value approaches the set-
point more quickly and the I part has less time to integrate the con-
trol difference. The overshooting is reduced.
If the proportional range selected is too small, the P part on the
control value is at 100% for a very long time. This value then
reduces more quickly within the proportional range, i.e. the control
value reduces rapidly and the approach of the actual value to the
setpoint almost comes to a standstill. Due to the I part not
becoming effective until now, the actual value approaches the set-
point slowly.
Indications of incorrect settings
Fig. 35: Optimum setting
Fig. 36: Control parameter Xp too
large
Fig. 37: Control parameter Xp too
small
Operation
Variocool
59
Summary of Contents for VC 10000
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