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3.8.7
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
● Precharging resistors
● Contactor for switching on and off
● Circuit-breaker
Detailed information about interconnecting the precharging components is provided in the
circuit manual. The component mounting locations are provided in the layout diagram.
3.8.8
Actual value sensing
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.
See also
Replacing the AVT combination module (Page 105)
Replacing the current transformer (Page 106)
3.8.9
Common power supply
3.8.9.1
Field of application
The common power supply (GSV) is an AC/AC converter that converts an alternating voltage
into a square-wave voltage.
The square-wave voltage of 55 V generated from the input voltage supplies four power outputs
with equality of access.
Each power output is monitored for undervoltage. When the voltage level of all power outputs
is within the standard range, the LED signaling the status indication lights up green. The device
Description
3.8 Components
SINAMICS PERFECT HARMONY GH150 6SL3825
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Operating Instructions 05/2020
Содержание 6SL3825
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