Dc Supply Voltage; General - Siemens SINAMICS S120 Equipment Manual

Cabinet Design and EMC
14.3 24 V DC Supply Voltage
14.3 24 V DC Supply Voltage
14.3.1

General

The 24 V DC voltage is required for the power supply of:
1. the electronics of the SINAMICS components via the integrated 24 V busbar
2. The electronics of the Control Units, Option Boards, Sensor Modules, and Terminal
Modules, as well as the process voltage of their digital inputs
3. The load voltage of the digital outputs
4. The motor holding brakes
A separate 24 V supply is recommended for a drive line-up.
Note
The electronics power supply must be provided by the user as described in section "System
data" of this document.
When the system is connected to a "DC supply" as defined in EN 60204-1:1997, Sect. 4.3.3,
malfunctions may occur as a result of the voltage interruptions permitted in supplies of this
type.
NOTICE
If other consumers are connected to the power supply, connected inductance devices
(contactors, relays) must be fitted with suitable overvoltage protection circuits.
NOTICE
The tolerances of the motor holding brakes and the voltage drops of the connection cables
must be taken into account. The electronics power supply may have to be increased.
Only motors with a safe electrically isolated holding brake may be connected. The brake
conductors must also be safely electrically isolated.
If the motor power cable is connected to intermediate terminals, the power cables and
brake cables must be routed apart (≥ 300 mm).
Only safety extra-low voltages (DVC A) that comply with EN61800-5-1 must be connected
to the connections and terminals between 0 and 48 V DC.
The voltage tolerances of the motor holding brakes must be taken into account.
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DANGER
DANGER
Booksize cold-plate power units
Manual, (GH4), 03.2007, 6SL3097-2AJ00-0BP4