Dc Supply Voltage; General - Siemens SINAMICS S120 Equipment Manual

Cabinet Design and EMC
12.3 24 V DC Supply Voltage
12.3 24 V DC Supply Voltage
12.3
12.3.1

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
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.
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.
Danger
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).
Danger
Only protective extra-low voltages (PELVs) that comply with EN60204-1 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.
12-8
Modules, as well as the process voltage of their digital inputs
Equipment Manual Booksize Cold-Plate Power Sections
Manual, (GH4), Edition 06.2005, 6SL3097-2AJ00-0BP2