Burkert Type 8620 - Manual (Page 111)

mxCONTROL Type 8620
Page 111
Figure 49: Slope of the ramp
In manual mode the set point according to the ramp function is set to the current process value.
If the ramp function is activated, the user can adjust the slope of the ramp to the particular conditions.
PI Controller
The description of the Proportional Integral (PI)-Controller is consistent to the PI-part of the PID
Controller in section “PID Controller” in chapter 14.2. Specifics / differences are described below.
Gain/amplification factor Kp:
In this module, the gain/amplification factor Kp can be parameterized separately for both controllers to
adjust the resulting control output in each case as best as possible to the respectively used actuator.
Integral part (I-part) / Reset time Tn:
In this module, the reset time Tn influencing the I-part can be parameterized separately for both
controllers.
Proportional part / Module sense of action:
The normal module sense of action is defined:
Proportional part: YpAcid[%] ) ( PV SP Kp
Acid
− ∗ − =
Proportional part: YpBase[%] ) ( PV SP Kp
Caus
− ∗ =
It can be illustrated as shown in the following figure:
Figure 50:
Sense of action of
the module and
deadband