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8.8
24 V DC supply voltage
8.8.1
General information
The 24 V DC voltage is required for:
• Supplying the electronics of the components via the integrated 24 V busbar
• Supplying the electronics of the Control Units, Option Boards, Sensor Modules, and Terminal
Modules, as well as the process voltage of their digital inputs
• Supplying the load voltage of the digital outputs
• Supplying the motor holding brakes
Note
Connecting the electronics power supply
Implement the 24 V electronics power supply as described in Chapter "System data".
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.
Note
Grounding the 24 V electronics power supply
In the components, electronics ground M is permanently connected to the protective conductor
potential. The connection cannot be disconnected.
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 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.
Other loads can be connected to these power supply units if they are separately protected
against overcurrent.
NOTICE
Damage to other loads as a result of overvoltage
Overvoltage of switched inductances (contactors, relays) can damage connected loads.
• Install suitable overvoltage protection circuits.
Booksize power units
Equipment Manual, 01/2022, 6SL3097-6AC30-0BP0
Control cabinet design and EMC booksize
8.8 24 V DC supply voltage
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