14.3 Control Structure in VVC
+
Advanced Vector Control
+
_
+
_
Config. 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
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*
130BA055.10
Illustration 14.2 Control Structure in VVC
+
Open-Loop and Closed-Loop Configurations
In
,
parameter 1-01 Motor Control Principle
is set to
[1] VVC
+
and
parameter 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
parameter 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
parameter 1-00 Configuration Mode
. The process PID parameters are located in
parameter group 7-2* Process Ctrl.
Feedback
and
parameter group 7-3* Process PID Ctrl
.
Controls
Design Guide
MG37N102
Danfoss A/S © 6/2016 All rights reserved.
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Summary of Contents for VLT 380-500 V
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