Configuring The Process Controller - Lenze i55AE125B Manual

10

Configuring 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 =
proportional, integral and differential controller).
The process controller is part of a closed control loop. The variable to be influenced (control-
led variable) is measured continuously 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 deviation resulting 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.
Connection plan (example)
The following sample connection plan shows the control of a pump
variable (here: pressure) takes place via a pressure transducer
input 1.
Inverter
+
+
The digital inputs can be used to activate functions of the process controller. The specific
assignment of the digital inputs and type of the contacts (switches or buttons, normally-closed
contacts or normally-open contacts) depends on the application.
General information on the setting
The basic setting of the process controller is described in the following subchapter.
•
4Basic process controller settings
Optionally, the motor can be put into an energy-saving idle state if no power is required.
•
4Process controller idle state
The rinsing function which can be activated in addition accelerates the motor in idle state
•
to a defined speed at regular intervals. The rinsing of a pipe system with a pump that has
been in an inactive state for a longer period is a typical application.
rinse function
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Configuring the process controller
. The feedback of the
①
connected to the analog
②
S1 S2 S3 S4 S5
P
4Process controller
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