Internal Current Control In Vvc+ Mode - Danfoss FC 300 Design Manual

FC 300 Design Guide
Introduction to FC 300
In the shown configuration, par. 1-01 Motor Control Principle is set to "Flux w motor feedb [3]" and par.
1-00 is set to "Speed closed loop [1]".
The motor control in this configuration relies on a feedback signal from an encoder mounted directly on
the motor (set in par. 1-02 Motor Shaft Encoder Source).
Select "Speed closed loop [1]" in par. 1-00 to use the resulting reference as an input for the Speed PID
control. The Speed PID control parameters are located in par. group 7-0*.
Select "Torque [2]" in par. 1-00 to use the resulting reference directly as a torque reference. Torque
control can only be selected in the Flux with motor feedback (par. 1-01 Motor Control Principle) config-
uration. 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 "Process [3]" in par. 1-00 to use the process PID control for closed loop control of e.g. speed or a
process variable in the controlled application.

Internal Current Control in VVC+ Mode

The frequency converter features an integral current limit control which is activated when the motor
current, and thus the torque, is higher than the torque limits set in par. 4-16, 4-17 and 4-18.
When the frequency converter is at the current limit during motor operation or regenerative operation,
the frequency converter will try to get below the preset torque limits as quickly as possible without losing
control of the motor.
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MG.33.B7.02 - VLT is a registered Danfoss trademark