45
8.2. Control
parameters
Xp =
When performing an identification for the controlled system
(temperature applications system) (see page 42), the control
parameters Xp, Tn, Tv and Xpu will be automatically determined
and stored.
Each parameter may be manually set via the keypad if
necessary, to allow optimum control performance.
•
Press
enter
to select the submenu "control
parameters".
•
Use the up/down cursor keys
to select the
desired option. A flashing segment indicates that a new value
needs to be entered.
•
Use the numerals to set the value and then set with enter
(example: Xp = 2.5 °C).
•
or at >DynInt<
Press the P-key
to select the parameter and press enter
.
•
Press
escape
to return to the previous menu level.
Proportional range >Xp<
The proportional range is the range below the selected
temperature value in wich the the control circuit reduces the
heating power from 100 % to 0 %.
Resetting time >Tn< (Integral component)
Compensation of the remaining control deviation due to
proportional regulation. An insufficient resetting time may cause
instabilities to occur. Excessive resetting time will unnecessarily
prolong compensation of the control difference.
Lead time >Tv< (Differential component)
The differential component reduces the control settling time. An
insufficient lead time will prolong the time required to
compensate for disturbance effects and cause high overshooting
during run-up. An excessive lead time could cause instabilities
(oscillations) to occur.
Proportional range >Xpu<
The proportional range Xpu of the cascaded controller is only
needed for external control.
Содержание Presto Plus LH 47
Страница 20: ...Operating controls and functional elements 20 Rear...
Страница 41: ...41...
