Siemens SINAMICS S120 Combi Equipment Manual page 294

Cabinet design and EMC
12.6 24 V DC supply
Other loads can be connected to these power supply units if they are separately protected
from overcurrent.
Note
The electronic power supply has to be supplied by the user as described in the System data
(Page 32) section of this documentation.
When connecting to a "DC power supply" in the sense of EN 60204-1:1997, Chapter 4.3.3,
functional faults can occur due to the voltage interruptions that are permitted there.
Danger to life through electric shock due to a terminal voltage that has not been adjusted
Death or serious injury can result when live parts are touched.
• Only connect protective extra-low voltages to all connections and terminals between 0
NOTICE
Damage when other loads are connected
If other loads are connected to the power supply, overvoltage can damage all components
• Fit the connected inductance devices (contactors, relays) with suitable overvoltage
Note
Malfunction because 24 V supply voltage is too low
If the 24 V supply voltage falls short of 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 on the last
device. Do not exceed the maximum value for the supply voltage. If required, supply the
voltage to the assembly at various locations.
Note
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 connecting cables must be taken into
account.
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:
• Use of Siemens three-phase motors
• Use of Siemens MOTION-CONNECT power cables
• Motor cable lengths, max. 50 m
1)
294
DANGER
and 48 V DC.
protection circuits.
70 m for an 18 A supplementary axis
1)
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5
SINAMICS S120 Combi