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

Introduction to FC 300
3.2.4 Control Structure in VVC
plus
Control structure in VVC open loop and closed loop configurations:
P 1-00
Con g. mode
Ref.
+
Process

_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
In the configuration shown in Illustration 3.3, 1-01 Motor Control Principle is set to "VVC
set to "Speed open loop [0]". 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 "Speed closed loop [1]" the resulting reference will be 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*.
The resulting reference from the Speed PID control is sent to the motor control limited by the frequency limit.
Select "Process [3]" 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* and 7-3*.
FC 300 Design Guide
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)
P 3-**
High
Ramp
Low
P 4-11
Motor speed
low limit (RPM)
P 4-12
Motor speed
low limit (Hz)
®
MG.33.BD.02 - VLT is a registered Danfoss trademark
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
plus
[1]" and 1-00 Configuration Mode is
3
P 4-19
Max. output freq.
+f max.
-f max.
19
3