Control Structure In Vvc Plus Advanced Vector Control - Danfoss VLT AutomationDrive FC 300 Design Manual

Product Introduction
3.2.2 Control Structure in VVC
3 3
Ref.
+

_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Illustration 3.4 Control Structure in VVC
In Illustration 3.4, 1-01 Motor Control Principle is set to [1] VVC
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.
24
VLT
plus
Advanced Vector Control
P 4-13
Motor speed
high limit (RPM)
P 1-00
P 4-14
Con g. mode
Motor speed
high limit (Hz)
High
Low
P 4-11
Motor speed
Process
low limit (RPM)
P 4-12
Motor speed
low limit (Hz)
plus Open Loop and Closed Loop Configurations
®
AutomationDrive FC 300 Design Guide 90-1200 kW
P 1-00
Con g. mode
P 3-**
Ramp
+

_
P 7-00 Speed PID
feedback source
plus and 1-00 Configuration Mode is set to [0] Speed open loop.
MG34S202 - Rev. 2013-08-19
P 4-19
Max. output freq.
+f max.
Motor
controller
-f max.
P 4-19
Max. output freq.
P 7-0*
Motor
Speed
PID controller
+f max.
-f max.