See also
Opening the device (Page 90)
3.8.8 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.
3.8.9 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 101)
Replacing the current transformer (Page 102)
Description
3.8 Components
SINAMICS SH150 6SL3805
36 Operating Instructions 05/2020
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