Possible Functions Of The 24 V Supply - Siemens Sinamics S120 Manual

Cabinet design

6.7 Possible functions of the 24 V supply

Risk of fire as a result of overheated motor cables if cross-sections are smaller than the
minimum permissible size
Excessively thin motor cables can result in overheating. This can result in severe injury or
death due to fire and smoke.
• Use cables that correspond to the Motor Module currents. Take into account the routing
• If smaller cross-sections are selected, you must ensure the appropriate level of
6.7 Possible functions of the 24 V supply
The 24 V DC voltage is required for:
● To supply the electronics of the SINAMICS components via the integrated 24 V busbar
● To supply the electronics of the Control Units, Active Interface Modules, Option Boards,
Sensor Modules, and Terminal Modules, as well as the process voltage of their digital
inputs
● To supply the load voltage of the digital outputs
● To supply the motor holding brakes
Other loads can be connected to these power supply units if they are separately protected
from overcurrent.
Note
The electronics power supply should be implemented by the user, as described in Chapter
"System data" (Page 35).
When connecting a DC power supply as specified in EN 60204-1:1997, Sect. 4.3.3,
malfunctions may occur due to the voltage interruptions permitted for them.
Danger to life as a result of electric shock if the brake cables are not correctly insulated.
When routing brake cables, whose insulation properties are not suitable fo safe electrical
separation, then the insulation can fail resulting in electric shock.
• Connect the holding brake with the specified MOTION-CONNECT cable.
• Only use third-party cables that have brake conductors with insulation properties that
104
WARNING
type, ambient temperature and cable length.
conductor protection in another way, e.g. by suitably setting the control parameters.
WARNING
comply with safe electrical separation or separately route the brake conductors to
absolutely ensure safe electrical separation.
Power Units in Booksize C/D-Type Format
Manual, 01/2017, 6SL3097-4AC20-0BP1