Fc 360 Control Principle - Danfoss VLT AutomationDrive FC 360 Design Manual

Product Overview

2.3.3 FC 360 Control Principle

FC 360 is a general-purpose frequency converter for variable speed applications. The control principle is based on voltage
+
vector control .
0.37–22 kW
FC 360 0.37–22 kW frequency converters can handle asynchronous motors and permanent magnet synchronous motors up
to 22 kW.
The current-sensing principle in FC 360 0.37–22 kW frequency converters is based on the current measurement by a resistor
in the DC link. The ground fault protection and short circuit behavior are handled by the same resistor.
L1 91
L2 92
L3 93
Illustration 2.12 Control Diagram for FC 360 0.37–22 kW
30–75 kW
FC 360 30–75 kW frequency converters can handle asynchronous motors only.
The current-sensing principle in FC 360 30–75 kW frequency converters is based on the current measurement in the motor
phases.
The ground fault protection and short circuit behavior on FC 360 30–75 kW frequency converters are handled by the 3
current transducers in the motor phases.
L1 91
L2 92
L3 93
Illustration 2.13 Control Diagram for FC 360 30–75 kW
MG06B402
Design Guide
Load sharing +
RFI switch
Load sharing +
89(+)
88(-)
Load sharing -
P 14-50
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Brake resistor
R+ R-
82 81
89(+)
Inrush
Load sharing -
88(-)
R inr Inrush
2 2
U 96
V 97
M
W 98
U 96
V 97
M
W 98
19