Precharging; Actual Value Sensing; Power Supply (For ≥42 Cells); Field Of Application - Siemens SINAMICS PERFECT HARMONY GH150 6SL3826 Operating Instructions Manual

Medium-voltage drive

Table of Contents

Description

3.7 Components

3.7.6

Precharging

The power cell capacitors must be precharged in order to avoid overcurrents and temporary

overvoltage conditions in the DC link when connecting the line supply. The DC link is

precharged via the auxiliary supply.

The precharging circuit comprises the following components:

● Precharging transformer

● Diode bridge

● Contactor for switching on and off

● Drive circuit breaker

● Low-voltage drives

Detailed information about interconnecting the precharging components is provided in the

circuit manual. The component mounting locations are provided in the layout diagram.

3.7.7

The actual value sensing is used to measure voltages and currents. The voltages are

measured using AVT combination modules, whose measuring resistors are connected in

series. The currents are measured using electronic LEM current transformers and AVT

combination modules.

AVT combination modules are separated and isolated from circuits that can be touched using

a transformer. The AVT combination modules convert analog signals into digital signals. They

transfer signals to the Power Stack Adapter (PSA) via fiber-optic cables.

Detailed information about interconnecting the actual value sensing modules is provided in the

circuit manual. The component mounting locations are provided in the layout diagram.

The common power supply is an AC/AC converter that converts an alternating voltage into a

square-wave voltage.

The specified input voltage is 230 V AC ±20 %, and an additional transformer is added, if a

control voltage of 120 V AC is required.

SINAMICS PERFECT HARMONY GH150 6SL3826

Operating Instructions 05/2020

Table of Contents