Sourcetronic ST600 - Product Overview; What this Chapter Contains; Basic Principle

Frequency Inverter ST600 Series High-Performance Multifunction VFD Product Overview
-8-
3 Product Overview
3.1 What this chapter contains
This chapter mainly introduces the operation principles, product features, layouts, nameplates and
model instructions.
3.2 Basic principle
The frequency inverter ST600 high-performance multifunction VFD is used to control asynchronous
AC induction motor and permanent-magnet synchronous motor. The figure below shows the main
circuit diagram of the VFD. 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 the AC
voltage used by AC motor. When the circuit voltage exceeds the maximum limit value, external brake
resistor will be connected to intermediate DC circuit to consume the feedback energy.
Figure 3-1 Main circuit diagram for standard and SP model VFDs 015G3 and below
R
S
T
U
V
W
（+）
（-）
PE PE
PB
Figure 3-2 Main circuit diagram for standard model VFDs 018G3–037G3
R
S
T
U
V
W
（+）
（-）
PE PE
PB