Options For The 24 V Supply Of The Components - Siemens SINAMICS S120 Manual

Cabinet design and EMC Booksize
12.6 24 V DC supply voltage
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.
Note
Motor holding brake connection
To ensure reliable opening of the motor holding brake, it requires a 24 V ± 10% voltage
supply at the motor connection. It must be taken into account that voltage dips can occur
along the supply cable.
• Use a Control Supply Module or a regulated DC power supply, whose setpoint is set to
26 V.
• Use supply cables with a minimum cross-section of 1.5 mm² and a maximum length of
100 m.
12.6.2

Options for the 24 V supply of the components

In a drive line-up, the Line Modules, Motor Modules and DC link components are connected
to the 24 V power supply via the integrated 24 V busbars. The current carrying capacity of
these busbars is 20 A. The 24 V infeed can be realized in two ways:
● Using a Control Supply Module
● Using an external 24 V power supply
Using a Control Supply Module
When a Current Supply Module is used, the 24 V supply is directly established via the
busbars. The electronic current limiting function integrated in the Control Supply Module
protects the busbar system when a fault occurs. Additional loads can be connected via the
24 V terminal adapter.
Note
If you use cables with a cross-section of 2.5 mm
24 V side for the following cable types:
• Cables of the XLPE type
• Cables of the EPR type
• Cable with a similar properties and which is thermally stable up to 90 °C
694
, no additional protection is required on the
2
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
Booksize Power Units