INVT Goodrive350-19 Series Operation Manual page 20

Goodrive350-19 Series VFD for Crane
3.1 What this chapter contains
This chapter mainly introduces the operation principles, product features, layouts, nameplates and
model designation rules.
3.2 Basic principles
The VFD is used to control asynchronous AC induction motors and permanent-magnet synchronous
motors. The following lists the main circuit diagrams of different VFD models. The rectifier converts
3PH AC voltage into DC voltage, and the capacitor bank of intermediate circuit stabilizes the DC
voltage. The inverter converts DC voltage into AC voltage that can be used by an AC motor. When the
circuit voltage exceeds the maximum limit value, external braking resistor will be connected to
intermediate DC circuit to consume the feedback energy.
R
S
T
PE
Figure 3-1 Main circuit diagram for 380V 15kW and lower VFD models
R
S
T
PE
Figure 3-2 Main circuit diagram for 380V 18.5kW–22kW and 90–110kW VFD models
3 Product overview
（+）
（-）
（+）
（-）
-8-
PB
PB
Product overview
U
V
W
PE
U
V
W
PE