Control Structure In Vvc Plus - Danfoss VLT AutomationDrive FC 301 Series Design Manual

Basic Operating Principles
3.6.3 Control Structure in VVC
P 1-00
Con g. mode
Ref.
+
Process

_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Figure 3.6 Control Structure in VVC
See Active/Inactive Parameters in Different Drive Control Modes in the Programming Guide for an overview of which control
configuration is available, depending on selection of AC motor or PM non-salient motor. In the configuration shown in
Figure 3.6, 1-01 Motor Control Principle is set to [1] VVC
resulting reference from the reference handling system is received and fed through the ramp limitation and speed limitation
before being sent to the motor control. The output of the motor control is then limited by the maximum frequency limit.
If 1-00 Configuration Mode is set to [1] Speed closed-loop, the resulting reference is passed from the ramp limitation and
speed limitation into a speed PID control. The Speed PID control parameters are located in parameter group 7-0* Speed PID
Ctrl. The resulting reference from the speed PID control is sent to the motor control limited by the frequency limit.
Select [3] Process in 1-00 Configuration Mode to use the process PID control for closed-loop control of, e.g. speed or pressure
in the controlled application. The Process PID parameters are located in parameter group 7-2* Process Ctrl. Feedb and 7-3*
Process PID Ctrl.
MG33BF22
Design Guide
plus
P 4-13
Motor speed
high limit (RPM)
P 1-00
P 4-14
Con g. mode
Motor speed
high limit (Hz)
P 3-**
High
Ramp
Low
P 4-11
Motor speed
low limit (RPM)
P 4-12
Motor speed
low limit (Hz)
plus
Open-loop and Closed-loop Configurations
plus and 1-00 Configuration Mode is set to [0] Speed open-loop. The
Rev. 2014-04-04 All rights reserved.
P 4-19
Max. output freq.
+f max.
Motor
controller
-f max.
P 7-0*
Speed Motor
+

PID controller
_
P 7-00 Speed PID
feedback source
3
P 4-19
Max. output freq.
+f max.
-f max.
21
3