Control Structure In Vvc Plus - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
Introduction to FC 300
Control Structure in VVC plus
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Control structure in VVC plus open loop and closed loop configurations:
In the configuration shown in the illustration above, par. 1-01 Motor Control Principle is set to "VVC plus
[1]" and par. 1-00 is set to "Speed open loop [0]". The resulting reference from the reference handling
system is received and fed through the ramp limitation and speed limitation before being sent to the motor
control. The output of the motor control is then limited by the maximum frequency limit.
If par. 1-00 is set to "Speed closed loop [1]" the resulting reference will be passed from the ramp limitation and
speed limitation into a speed PID control. The Speed PID control parameters are located in the par. group 7-0*.
The resulting reference from the Speed PID control is sent to the motor control limited by the frequency limit.
Select "Process [3]" in par. 1-00 to use the process PID control for closed loop control of e.g. speed or
pressure in the controlled application. The Process PID parameters are located in par. group 7-2* and 7-3*.
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