Lenze i410 - Configuring the Process Controller

7.3 Conguring the process controller
By means of the process controller, a process variable can be regulated, for instance the
pr
essure of a pump. The process controller is also referred to as "PID controller" (PID
controller = proporonal, integral and dierenal controller).
The process controller is part of a closed control loop. The variable to be inuenced
(controlled variable) is measured connuously by means of a sensor and supplied to the
inverter as an analog signal (actual value) which, in the inverter, is then compared to the
reference value (setpoint). The system deviaon resulng therefrom is supplied to the process
controller which, on this basis, decelerates or accelerates the motor speed according to the
desired dynamic performance of the control loop, so that, for instance, a pump always
generates the desired pressure.
Connecon plan (example)
The following sample connecon plan shows the control of a pump
①
. The feedback of the
variable (here: pressure) takes place via a pressure transducer
②
connected to the analog
input 1.
S5S4S3S1 S2
+
M
+
J
J
T1
T1 U W V Rb1 Rb2 X105
X109
3~
Inverter
P
The digital inputs can be used to acvate funcons of the process controller. The specic
assignment of the digital inputs and type of the contacts (switches or buons, normally-closed
c
ontacts or normally-open contacts) depends on the applicaon.
General informaon on the seng
•
Fir
st implement the basic seng of the frequency control.4Basic seng ^
64
•
The basic seng of the process controller is described in the following subchapter.
4Basic seng^ 99
•
Oponally, the motor can be put into an energy-saving sleep mode if no power is required.
4Pr
ocess controller sleep mode^ 105
•
The rinsing funcon which can be acvated in addion accelerates the motor in idle state
to a dened speed at regular intervals.The rinsing of a pipe system with a pump that has
been in an inacve state for a longer period is a typical applicaon. 4Pr
ocess controller
rinse funcon^ 107
Conguring the frequency control
Conguring the process controller
98