Danfoss VLT AQUA Drive FC 202 Design Manual page 198

Basic Operating Principles ...
11.2.7.2 Control Structure in Flux Sensorless
Ref.
Figure 11.9 Control Structure in Flux Sensorless Open Loop and Closed-loop Configurations
In Figure 11.9, the resulting reference from the reference handling system is fed through the ramp and speed limitations as
determined by the parameter settings indicated.
Parameter 1-01 Motor Control Principle is set to [2] Flux Sensorless and parameter 1-00 Configuration Mode is set to [0] Speed
open loop. An estimated speed feedback is generated to the speed PID to control the output frequency. The speed PID must
11 11
be set with its P, I, and D parameters (parameter group 7-0* Speed PID control).
Select [3] Process in parameter 1-00 Configuration Mode to use the process PID control for closed-loop control of the
controlled application. The process PID parameters are found in parameter groups 7-2* Process Ctrl. Feedb and 7-3* Process
PID Ctrl.
196
P 1-00
Con g. mode
+
Process

PID
_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
®
VLT AQUA Drive FC 202
P 4-13 Motor speed
high limit [RPM]
P 4-14 Motor speed
high limit [Hz]
High
P 3-**
Ramp
Low
P 4-11 Motor speed
low limit [RPM]
P 4-12 Motor speed
low limit [Hz]
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P 7-0*
+
Motor
Speed

controller
PID
_
P 4-19
Max. output
freq.
+f max.
-f max.
MG22B222