Control Structure In Vvc - Danfoss FC 300 Design Manual

FC 300 Design Guide
Introduction to FC 300
FC 302 is a high performance frequency converter for demanding applications. The frequency converter
can handle various kinds of motor control principles such as U/f special motor mode, VVCplus or Flux
Vector motor control.
FC 302 is able to handle Permanent Magnet Synchronous Motors (Brushless servo motors) as well as
normal squirrel cage asynchronous motors.
Short circuit behaviour on FC 302 depends on the 3 current transducers in the motor phases and the
desaturation protection with feedback from the brake.
plus

Control Structure in VVC

Control structure in VVC plus open loop and closed loop configurations:
plus
In the configuration shown in the illustration above, par. 1-01 Motor Control Principle is set to "VVC
[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 limi-
tation 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.
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MG.33.B7.02 - VLT is a registered Danfoss trademark