Lenze i55AE155F

10 Conguring the process controller
By means of the process controller, a process variable can be regulated, for instance the pres-
sure 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 (control-
led 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
contacts or normally-open contacts) depends on the applicaon.
General informaon on the seng
•
The basic seng of the process controller is described in the following subchapter.
4Basic process controller sengs ^ 408
•
Oponally, the motor can be put into an energy-saving idle state if no power is required.
4Process controller idle state ^ 414
•
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. 4Process controller
rinse funcon ^ 416
Conguring the process controller
407