Control Structure In Flux With Motor Feedback - Danfoss VLT Decentral Drive FCD 302 Design Manual

Application Examples
Ref.
+
Process

PID
_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Illustration 4.16 Control Structure in Flux Sensorless
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.

4.5.3 Control Structure in Flux with Motor Feedback

P 7-2*
Ref.
+
Process
PID
_
P 7-20 Process feedback
1 source
P 7-22 Process feedback
2 source
Illustration 4.17 Control Structure in Flux with Motor Feedback
In the configuration shown, 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).
®
VLT Decentral Drive FCD 302
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)
High
P 3-**
Ramp
Low
P 4-11 Motor speed
low limit (RPM)
P 4-12 Motor speed
low limit (Hz)
®
MG04H102 - VLT is a registered Danfoss trademark
P 3-** P 7-0*
+
Ramp
Speed

PID
_
The Speed PID must be set with its P,I, and D parameters
(parameter group 7-0*).
Select [3] Process in 1-00 Configuration Mode to use the
process PID control for closed loop control of speed or
pressure in the controlled application. The Process PID
parameters are found in parameter group 7-2* and 7-3*.
P 1-00
Con g. mode
Torque
P 7-0*
+
Speed
PID
_
P 7-00
PID 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
P 4-19
Max. output
freq.
+f max.
Motor
controller
-f max.
P 4-19
Max. output
freq.
+f max.
Motor
controller
-f max.
63
4 4