Connection of the Components
5.6 Electronics Power Supply
Guide for the SINUMERIK 840D sl machine configuring
5-50 Manual, 07/2006 Edition, 6FC5397-6CP10-0BA0
Example for the splitting of the consumer lines:
● NCU / NX
● Line / Motor Modules
● Supply of the Sensor Modules
● Consumers such as relays, valves, etc.
● Additional brakes not supplied from the Motor Module
Multiple power supplies are recommended for larger plant concepts.
Example of the separation:
● Power supply for the direct drive system (NCU, NX, LM, MM, SME and SMC)
● Power supply for additional consumers, such as brakes, valves and power contactors
If required, the circuit-breakers can be equipped with additional auxiliary switches. If these
signal contacts are fed to a higher-level controller, a detailed fault diagnosis can be
performed when the circuit-breakers trip.
Notes
● SINAMICS components have a reverse polarity protection on the 24 VDC infeed side.
● Line, Motor, Braking, Capacitor and Control Supply Modules are short-circuit resistant on
the 24 V busbar for a maximum current of 20 A. The 24 V terminal adapter for the infeed
has a maximum connection cross-section of 6 mm
2
.
● If no higher short-circuit current can occur, a protection can be omitted. This means the
components can be connected directly to the power supply.
● If higher short-circuit current occur, a protection against over-current / short-circuit must
be provided, max. 20 A, however. In a fault situation, the used power supply must be able
to supply the required current until tripping.
● The maximum protection of the power supply infeed for Control Unit and Sensor Module
Cabinet depends on the connected cable cross-section (max. 2.5 mm
2
), maximum 20 A,
however.
● The maximum protection of the controller inputs/outputs at the other components
depends on the connected cable cross-section:
Component max. cable cross-section
Control Unit 0.5 mm
2
Sensor Module Cabinet (SMC) 1.5 mm
2
Smart Line Module 1.5 mm
2
Active Line Module 1.5 mm
2
Motor Module 1.5 mm
2
● Controller outputs at the Line, Motor and Braking Module, Control Unit and Sensor
Module Cabinet are short-circuit resistant.
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