Siemens SINAMICS S110 Manual page 233

Note
The electronics power supply must be set up by the user as described in Chapter System
data (Page 29).
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.
NOTICE
Damage to loads due to overvoltage
An overvoltage from switched inducted loads (contactors, relays) can damage connected
loads.
• Install suitable surge protection.
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 to ensure a 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
Voltage supply to motor holding brakes
A regulated DC power supply is required to operate motors with a built-in holding brake. The
power is supplied via the 24 V connection (Safe Brake Relay). The voltage tolerances of the
motor holding brakes (24 V ± 10%) and the voltage drops of the connection cables must be
taken into account.
The DC power supply should be set to 26 V. This ensures that the power supply 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. 100 m
SINAMICS S110
Manual, 07/2015, 6SL3097-4AC10-0BP5
Cabinet design and EMC for components, Blocksize format
10.5 24 V DC Supply Voltage
233