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

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12.7 24 V DC supply voltage

A regulated DC power supply is required to operate motors with a built-in holding brake. The

voltage is supplied via the internal 24 V busbars. The voltage tolerances of the motor holding

brakes (24 V ± 10%) and the voltage drops of the connection cables must be taken into

The DC power supply should be set to 26 V. The Control Supply Module supplies 26 V. This

ensures that the supply voltage for the brake remains within the permissible range when the

following conditions are fulfilled:

• Siemens three-phase motors must be used

• Siemens MOTION-CONNECT power cables are used

• Motor cable lengths, max. 100 m

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:

1. 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.

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

, no additional protection is required on the

Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6

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