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3.2.3 FC 301 vs. FC 302 Control Principle
FC 301 is a general purpose frequency converter for variable speed applications. The control principle is based on Voltage
Vector Control (VVC
plus
).
FC 301 can handle asynchronous motors only.
The current sensing principle in FC 301 is based on current measurement in the DC link or motor phase. The ground fault
protection on the motor side is solved by a de-saturation circuit in the IGBTs connected to the control board.
Short circuit behaviour on FC 301 depends on the current transducer in the positive DC link and the desaturation protection
with feedback from the 3 lower IGBT's and the brake.
M
L2 92
L1 91
L3 93
89(+)
88(-)
R+
82
R-
81
U 96
V 97
W 98
130BA192.12
Inrush
R inr
Load sharing -
De-saturation protection
Load s
Brake
Resistor
Drive
Control
Board
Illustration 3.1 FC 301
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, VVC
plus
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.
Inrush
R inr
Load sharing -
Load s
LC Filter -
(5A)
LC
(5A)
Brake
Resistor
130BA193.13
M
L2 92
L1 91
L3 93
89(+)
88(-)
R+
82
R-
81
U 96
V 97
W 98
P 14-50
Illustration 3.2 FC 302
Introduction to FC 300
FC 300 Design Guide
18
MG.33.BD.02 - VLT
®
is a registered Danfoss trademark
3
3
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