Connection of the Components
5.6 Electronics Power Supply
Guide for the SINUMERIK 840D sl machine configuring
5-42 Manual, 07/2006 Edition, 6FC5397-6CP10-0BA0
5.6 5.6 Electronics Power Supply
For the electronics power supply, a differentiation is made between:
● external power supply with SITOP modular
● internal power supply with Control Supply Module (CSM)
5.6.1 External power supply (SITOP modular)
An external SITOP modular power supply must be provided for the electronics power supply
of the individual SINAMICS components. This ensures the trouble-free operation of all
SINAMICS components. The SITOP electronics power supply also has the advantage that
the power supply is already equipped with an internal line filter (class B in accordance with
EN55022). This ensures an EMC-conform operation.
If a power supply other than SITOP is used, the required rated data (see Equipment Manual
for Booksize Power Units) must be observed to ensure a trouble-free operation.
24 VDC power is required to supply
● the electronics of the SINAMICS components using the integrated 24 V busbar
● the electronics for Control Units, Option Boards and Sensor Modules, and the process
voltage of their digital inputs
● the load voltage of the digital outputs
● the motor holding brakes
Other consumers may be connected to the power supply devices provided they have
separate protection against excess current.
Caution
If other consumers are connected to the power supply, switch inductances (contactors,
relays) must be provided with suitable over-voltage protective circuits.
The operation of motors with integrated holding brake requires a regulated DC power supply.
The power is supplied from the internal 24 V busbars. The voltage tolerances of the motor
holding brakes and the voltage losses of the connection cables must be observed.
The DC power supply should be set to 26 V. The Control Supply Module supplies 26 V. This
ensures that the voltage supplied to the brake lies within the permitted range when the
following general conditions are satisfied:
● Use of Siemens three-phase motors
● Use of Siemens MOTION-CONNECT power cables
● Motor cable lengths maximum 100 m
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