Control Structure In Flux Sensorless (Fc 302 Only); Mg33Bf22 - Danfoss VLT AutomationDrive FC 301 Series Design Manual

Basic Operating Principles

3.6.4 Control Structure in Flux Sensorless (FC 302 only)

3 3
Ref.
+
Figure 3.7 Control Structure in Flux Sensorless Open-loop and Closed-loop Configurations
See Active/Inactive Parameters in Different Drive Control Modes in the Programming Guide for an overview of which control
configuration is available, depending on selection of AC motor or PM non-salient motor. In the configuration shown,
1-01 Motor Control Principle is set to [2] Flux sensorless and 1-00 Configuration Mode is set to [0] Speed open-loop. The
resulting reference from the reference handling system is fed through the ramp and speed limitations as determined by the
parameter settings indicated.
An estimated speed feedback is generated to the speed PID to control the output frequency.
The Speed PID must be set with its P, I, and D parameters (parameter group 7-0* Speed PID control).
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 found in parameter group 7-2* Process Ctrl. Feedb and 7-3*
Process PID Ctrl.
22
Design Guide
P 1-00
Con g. mode
Process

PID
_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Rev. 2014-04-04 All rights reserved.
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]
P 4-19
Max. output
freq.
P 7-0*
Motor
Speed

controller
PID
+f max.
-f max.

MG33BF22