Danfoss VLT AutomationDrive FC 300 Design Guide

3.2.2
Control Structure in VVC
plus
Advanced Vector Control
+
_
+
_


Cong. mode
Ref.
Process
P 1-00
High
+f max.
Low
-f max.
P 4-11
Motor speed
low limit (RPM)
P 4-12
Motor speed
low limit (Hz)
P 4-13
Motor speed
high limit (RPM)
P 4-14
Motor speed
high limit (Hz)
Motor
controller
Ramp
Speed
PID
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
P 7-00 Speed PID
feedback source
P 1-00
Cong. mode
P 4-19
Max. output freq.
-f max.
Motor
controller
P 4-19
Max. output freq.
+f max.
P 3-**
P 7-0*
130BA055.10
Figure 3.4 Control Structure in VVC
plus
Open-loop and Closed-loop Configurations
In Figure 3.4, 1-01 Motor Control Principle is set to [1] VVC
plus
and 1-00 Configuration Mode is set to [0] Speed open-loop. The
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 the 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.
To use the process PID control for closed-loop control of speed or pressure in the controlled application, for example, select
[3] Process in 1-00 Configuration Mode. The Process PID parameters are located in parameter group 7-2* Process Ctrl, Feedback
and 7-3* Process PID Ctrl.
Product Introduction Design Guide
26 Danfoss A/S © Rev. 2014-02-10 All rights reserved. MG34S222
33

Danfoss VLT AutomationDrive FC 300 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 300
Category	DC Drives
Language	English