Danfoss VLT AutomationDrive FC 302 Design Manual page 185

Basic Operating Principles ...
11.2.7.3 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 11.10 Control Structure in Flux with Motor Feedback Configuration
In Illustration 11.10, the motor control in this configuration relies on a feedback signal from an encoder or resolver mounted
directly on the motor (set in parameter 1-02 Flux Motor Feedback Source). The resulting reference can be used as input for
the speed PID control, or directly as a torque reference.
Parameter 1-01 Motor Control Principle is set to [3] Flux w motor feedb and parameter 1-00 Configuration Mode is set to [1]
Speed closed loop. The speed PID control parameters are in parameter group 7-0* Speed PID Control.
Torque control can only be selected in the Flux with motor feedback (parameter 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 based on the current measurement of the drive.
Process PID control can be used for closed-loop control of speed or pressure in the controlled application. The process PID
parameters are in parameter groups 7-2* Process Ctrl. Feedb and 7-3* Process PID Ctrl.
11.2.7.4 Internal Current Control in VVC
When the motor torque exceeds the torque limits set in parameter 4-16 Torque Limit Motor Mode, parameter 4-17 Torque Limit
Generator Mode, and parameter 4-18 Current Limit, the integral current limit control is activated.
When the drive is at the current limit during motor operation or regenerative operation, it tries to get below the preset
torque limits as quickly as possible without losing control of the motor.
MG38C202
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
P 3-**
Ramp
Low
P 4-11 Motor speed
low limit (RPM)
P 4-12 Motor speed
low limit (Hz)
+
Mode
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P 1-00
Con g. mode
Torque
P 7-0*
+
Speed
PID
_
P 7-00
PID source
P 4-19
Max. output
freq.
+f max.
Motor
controller
-f max.
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