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Controls
14.3 Control Structure in VVC
P 1-00
Con g. mode
Ref.
+
Process
_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Illustration 14.2 Control Structure in VVC
In Illustration 14.2, parameter 1-01 Motor Control Principle is set to [1] VVC
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.
MG37N102
Design Guide
+
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)
+
Open-Loop and Closed-Loop Configurations
Danfoss A/S © 6/2016 All rights reserved.
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
+
and parameter 1-00 Configuration Mode is set to [0]
P 4-19
Max. output freq.
+f max.
-f max.
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