Process Pid Control - Danfoss FC 300 Design Manual

FC 300 Design Guide
Generally the practical maximum limit of par. 7-02 is determined by the encoder resolution and the
feedback filter time but other factors in the application might limit the par. 7-02 Proportional Gain to a
lower value.
To minimize the overshoot, par. 7-03 Integral Time could be set to approx. 2.5 s (varies with the appli-
cation).
Par. 7-04 Differential Time should be set to 0 until everything else is tuned. If necessary finish the tuning
by experimenting with small increments of this setting.

Process PID Control

The Process PID Control can be used to control application parameters that can be measured by a sensor
(i.e. pressure, temperature, flow) and be affected by the connected motor through a pump, fan or oth-
erwise.
The table shows the control configurations where the Process Control is possible. When a Flux Vector
motor control principle is used, take care also to tune the Speed Control PID parameters. Refer to the
section about the Control Structure to see where the Speed Control is active.
Par. 1-00 Configura- Par. 1-01 Motor Control Principle
tion Mode U/f
[3] Process N.A.
Note: The Process Control PID will work under the default parameter setting, but tuning the parameters
is highly recommended to optimise the application control performance. The two Flux motor control prin-
ciples are specially dependant on proper Speed Control PID tuning (prior to tuning the Process Control
PID) to yield their full potential.
Process PID Control diagram
Introduction to FC 300
VVCplus
Process
MG.33.B7.02 - VLT is a registered Danfoss trademark
Flux Sensorless Flux w/ enc. feedb
Process & Speed Process & Speed
31