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

Introduction

3.2.6 Control Structure in Flux with Motor Feedback

3 3
Ref. +
_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Illustration 3.5 Control Structure in Flux with Motor Feedback Configuration (only available in FC 302)
See the chapter 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 shown config-
uration, 1-01 Motor Control Principle is set to [3] Flux w motor feedb and 1-00 Configuration Mode is set to [1] Speed closed
loop.
The motor control in this configuration relies on a feedback signal from an encoder mounted directly on the motor (set in
1-02 Flux Motor Feedback Source).
Select [1] Speed closed loop in 1-00 Configuration Mode to use the resulting reference as an input for the Speed PID control.
The Speed PID control parameters are located in parameter group 7-0*.
Select [2] Torque in 1-00 Configuration Mode to use the resulting reference directly as a torque reference. Torque control can
only be selected in the Flux with motor feedback (1-01 Motor Control Principle) configuration. When this mode has been
selected, the reference will use the Nm unit. It requires no torque feedback, since the actual torque is calculated on the
basis of the current measurement of the frequency converter.
Select [3] Process in 1-00 Configuration Mode to use the process PID control for closed loop control of e.g. speed or a process
variable in the controlled application.
20
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®
VLT AutomationDrive FC 300 Design Guide, 0.25-75 kW
P 1-00
Con g. mode
P 4-13 Motor speed
high limit (RPM)
P 4-14 Motor speed
high limit (Hz)
High
P 7-2*
Process
PID
Low
P 4-11 Motor speed
low limit (RPM)
P 4-12 Motor speed
low limit (Hz)
MG33BE02 - VLT
Torque
P 3-** P 7-0*
+
Speed
Ramp
PID
_
P 7-00
PID source
®
is a registered Danfoss trademark
P 1-00
Con g. mode
P 4-19
Max. output
freq.
+f max.
Motor
controller
-f max.