Control Structure In Flux With Motor Feedback (Fc 302 Only) - Danfoss VLT AutomationDrive FC 301 Design Manual

Basic Operating Principles

3.6.5 Control Structure in Flux with Motor Feedback (FC 302 only)

3 3
Ref.
+
_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Illustration 3.8 Control Structure in Flux with Motor Feedback Configuration (only available in FC 302)
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 shown configuration,
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 or resolver 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* Speed PID Control.
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 uses 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.
22
®
VLT AutomationDrive FC 301/FC 302 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)
Torque
P 3-** P 7-0*
+
Speed
Ramp
PID
_
P 7-00
PID source
MG33BF02 - Rev. 2013-12-20
P 1-00
Con g. mode
P 4-19
Max. output
freq.
+f max.
Motor
controller
-f max.