Siemens SIMATIC S7-1500 System Manual page 128

Connecting
8.5 Connecting the supply voltage
Connecting the power supply
The supply voltage is supplied over a 4-pin connector at the front of the SIMATIC Drive
Controller (behind the top cover).
Use rigid or flexible cables with a conductor cross-section as specified in the SIMATIC Drive
Controller manual (https://support.industry.siemens.com/cs/ww/en/view/109766666) for
wiring the power supply.
Tighten the connector using a flat-blade screwdriver.
The following special requirements apply to the connecting cables:
• The 24 V DC line must be approved for temperatures up to at least 75 °C.
• Select the permissible conductor cross-section according to the national regulations (NEC,
VDE, etc.). The basis for this can be the output current of the 24 V DC supply or the
overcurrent protection device used in the 24 V circuit. If the short-circuit current of the
utilized 24 V power supply unit is greater than 50 A, an appropriate overcurrent protection
device that limits the short-circuit current to this value must be used upstream of the
product.
• The protective conductor connection must be designed with a minimum cross-section in
accordance with EN 60204-1.
• Strip 7 mm from the cables for the connection to the 24 V DC connector.
• Adhere to the permissible bending radius of the cables.
• Lay all cables in such a way that no cables are crushed.
• Lay all cables so that they do not touch any abrasive edges.
Note
If power supplies with primary side supplies up to 600 V AC (voltage conductor to neutral
conductor) are to be used, the transient voltages on the primary side of the power supply
must be limited to 4000 V. Only connect the device to a 24 V DC power supply that meets the
requirements of a safe extra-low voltage (PELV) according to UL 61010.
126
SIMATIC Drive Controller
System Manual, 11/2023, A5E46600094-AD