Siemens Sinamics S120M, Equipment Manual

Page: 130 / 186

8.3 24 V DC supply voltage
8.3.1 General
The 24 V DC voltage is required for:
● Supply to the electronics of the SINAMICS components via the integrated 24 V busbar
● Supply to the electronics of the Control Units, Option Boards, Sensor Modules, and
Terminal Modules, as well as the process voltage of their digital inputs
● To supply the load voltage of the digital outputs
● To supply the motor holding brakes
Note
Electronics power supply
For information on the electronics power supply, see the chapter titled "System data (Page 51)"
in this documentation.
NOTICE
Damage to loads due to overvoltage
Overvoltage of switched inductances (contactors, relays) can damage connected loads.
● Install suitable overvoltage protection circuits and devices.
8.3.2 24 V power supply and connection of components
The Line Modules, Adapter Modules 600, and DC-link components are connected to the 24
VDC power supply via the integrated 24 VDC busbars. The current-carrying capacity of the 24
V busbars is 20 A.
Note
Malfunction because 24 V supply voltage is too low
If the 24 V supply voltage falls short of the specified minimum value on a device in the assembly,
a malfunction can occur.
● Select an input voltage that is high enough for there to be sufficient voltage on the last
device.
● Do not exceed the maximum value for the supply voltage.
● If required, supply the voltage to the assembly at several locations in the line-up.
The 24 V can be connected in 2 ways:
Control cabinet design
8.3 24 V DC supply voltage
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Manual, 06/2019, 6SL3097-5AW00-0BP1