Connecting
4
4.1 Supply voltage X124
24V DC supply voltage (X124)
The SIMATIC Drive Controller is powered by an external 24VDC power supply. Power
supplies from the SITOP family, for example, can be used.
WARNING
Danger to life from hazardous voltage when an unsuitable power supply is connected
Design the 24V direct voltage as protective extra-low voltage.
When an external 24VDC power supply is connected, it must comply with the requirements
for protective extra-low voltage (PELV) according to UL61010. A backup fuse that reliably
trips within 120seconds in the event of a short-circuit at an ambient temperature of 0°C
must also be available.
When OVC III circuits up to 600VAC (phase to neutral voltage) are the primary supply of the
utilized power supply, ensure that the clearance between open contacts of the fuse or the
single-fault-secure circuit is 3.0mm according to UL61010.
When using an external power supply, ensure that the trip rating of the utilized fuse
corresponds to the maximum possible short-time short-circuit current of the utilized power
supply.
NOTE
Ground potential and enclosure (PE) are connected to one another internally with low
impedance. You must therefore observe the following:
• Insulation monitoring devices are not permitted in the 24V power supply.
• If you are using external power supplies (e.g. SITOP), you must connect the ground
potential to the protective conductor terminal (PELV).
• You must provide adequately dimensioned equipotential bonding connections between
the 24V power supply and all grounded, locally separate loads.
You can find information on equipotential bonding in the SIMATIC Drive Controller system
manual (https://support.industry.siemens.com/cs/ww/en/view/109766665).
43
SIMATIC Drive Controller
Equipment Manual, 11/2022, A5E46600370-AC
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