Control Structure In Flux Sensorless; Control Structure In Flux With Motor Feedback - Danfoss VLT AutomationDrive FC 300 Design Manual

Product Introduction

3.2.3 Control Structure in Flux Sensorless

Ref.
+
Process

PID
_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Figure 3.5 Control Structure in Flux Sensorless Open-loop and Closed-loop Configurations
In Figure 3.5, 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 Ctrl).
To use the process PID control for closed-loop control of speed or pressure in the controlled application, for example, select
[3] Process in 1-00 Configuration Mode. The Process PID parameters are found in parameter group 7-2* Process Ctrl. Feedback
and 7-3* Process PID Ctrl.

3.2.4 Control Structure in Flux with Motor Feedback

Ref. +
_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Figure 3.6 Control Structure in Flux with Motor Feedback Configuration (Only Available in FC 302)
MG34S222
Design Guide
P 1-00
Con g. mode
P 4-13 Motor speed
high limit [RPM]
P 4-14 Motor speed
high limit [Hz]
High
Low
P 4-11 Motor speed
low limit [RPM]
P 4-12 Motor speed
low limit [Hz]
P 1-00
Con g. mode
P 4-13 Motor speed
high limit (RPM)
P 4-14 Motor speed
high limit (Hz)
P 7-2* High
Process
PID
Low
P 4-11 Motor speed
low limit (RPM)
P 4-12 Motor speed
low limit (Hz)
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
P 3-** P 7-0*
+
Ramp
Speed

PID
_
P 1-00
Con g. mode
Torque
P 3-** P 7-0*
+
Speed
Ramp
PID
_
P 7-00
PID source
P 4-19
Max. output
freq.
+f max.
Motor
controller
-f max.
P 4-19
Max. output
freq.
+f max.
Motor
controller
-f max.
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