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2.3.3 Control Structure in VVC
plus
+
_
+
_
S
S
Config. mode
Ref.
Process
P 1-00
High
+f max.
Low
-f max.
P 4-12
Motor speed
low limit (Hz)
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
Config. mode
P 4-19
Max. output freq.
-f max.
Motor
controller
P 4-19
Max. output freq.
+f max.
P 3-**
P 7-0*
130BD371.10
Illustration 2.2 Control Structure in VVC
plus
Open Loop and Closed Loop Configurations
In the configuration shown in
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 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* 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
.
Product Overview
VLT
®
AutomationDrive FC 360 Design Guide
MG06B202 - VLT
®
is a registered Danfoss trademark
15
2
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