Dc Supply Voltage; General - Siemens SINAMICS S120 Manual

Cabinet design and EMC for components, Blocksize format
10.5 24 V DC Supply Voltage
Routing 24 V cables
When routing 24 V cables, the following must also be observed:
● No more than 1 conductor pair may be bundled together.
● 24 V conductors must be routed separately from other cables and conductors that could
conduct the operating current.
● 24 V cables must never be routed parallel to power cables.
● 24 V cables as well as power cables should be routed to the components so that they
never cover ventilation slots
Conditions of use for 24 V cables
● Ambient temperature 55 °C
● Limit conductor temperature, ≤ 70° C for operation with the rated load current
● Cable length up to 30 m for 24-V power supply cables or for signal cables without
additional circuit elements
10.5 24 V DC Supply Voltage
10.5.1

General

The 24 VDC voltage is required for the power supply:
1. The load voltage of the Control Unit digital outputs
The Control Units are supplied with power via the PM-IF. 24 V must also be connected in
the following cases:
– Commissioning / diagnostics when the Power Module power supply is switched-out.
– Using the digital outputs CU310-2
2. The electronics of Sensor Modules
3. The Safe Brake Relay (motor holding brakes)
Other loads can be connected to these power supply units if they are separately protected
from overcurrent.
Note
The electronic power supply (PELV/SELV) has to be supplied by the user as described in
Chapter System data for PM240-2 Blocksize Power Modules (Page 34).
When connecting a "DC power supply" according to EN 60204-1 malfunctions can occur as
a result of the voltage interruptions that are permitted there.
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Manual, (GH6), 07/2016, 6SL3097-4AL00-0BP5
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