24 V Dc Supply Voltage; General Information - Siemens Sinamics S120 Manual

12.7

24 V DC supply voltage

12.7.1

General information

The 24 V DC voltage is required for:
● To supply the electronics of the SINAMICS components via the integrated 24 V busbar
● To supply the electronics of the Control Units, Option Boards, Sensor Modules, and
● To supply the load voltage of the digital outputs
● To supply the motor holding brakes
Other loads can be connected to these power supply units if they are separately protected
from overcurrent.
Note
The electronics power supply should be implemented by the user, as described in Chapter
System data (Page 45).
When connecting a DC power supply as specified in EN 60204-1:1997, Sect. 4.3.3,
malfunctions may occur due to the voltage interruptions permitted for them.
Danger to life through electric shock due to incorrectly laid brake cables
If brake cables are laid without safe electrical separation, the insulation can fail and cause
an electric shock.
• Connect the holding brake with the specified MOTION-CONNECT cable.
• Only use third-party cables with safe electrically separated brake cores or lay the brake
NOTICE
Damage to other loads as a result of overvoltage
Overvoltages of switched inductances (contactors, relays) can damage connected loads.
• Install suitable overvoltage protection circuits and devices.
Note
Malfunction because 24 V supply voltage is too low
If the 24 V supply voltage falls below 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 at the last
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
Terminal Modules, as well as the process voltage of their digital inputs
WARNING
cores with safe electrical separation.
device. Do not exceed the maximum value for the supply voltage. If required, supply the
voltage to the assembly at various locations in the lineup.
Cabinet design and EMC Booksize
12.7 24 V DC supply voltage
719