How do I dimension the powersupply of my SmartWire-DTtopology?3302/11 MN05006002Z-ENHow do I dimension thepower supply of mySmartWire-DT topology?Each SmartWire-DT gateway has a built-in power supplyunit, which provides two separate supply voltages in theSmartWire-DT network:• The 15 V DC device supply voltage U VP (device supply)for the electronics of the downstream SmartWire-DTslaves. The SmartWire-DT gateway (or a SmartWire-DTpower feeder module PF2) generates this 15 V DC supplyvoltage from the 24 V DC supply voltage applied to thespring-loaded terminal POW connection.• The 24 V DC control voltage U AUX , if you energizecontactor coils (contactor supply) through a Smart-Wire-DT module DIL-SWD-32-…/PKE-SWD32.The calculations of the electrical load and the voltage drophave to be made separately for devices and contactor supply.Connection of the SmartWire-DT network to the SmartWire-DT gateway and to the SmartWire-DT power feeder moduleis always performed via the 8-conductor SmartWire-DTribbon cable. With a cross-sectional area of 0.23 mm²(AWG 24) per ribbon cable conductor the maximum currentcarrying capacity is 3 A conform IEC/EN or 2 A conformUL 508.Not until you are in the subsequent SmartWire-DT topology,e.g. in the case of a surface mounting enclosure, can you usethe SmartWire-DT round cable, which has a cross-section of0.5 mm ² for the conductors of the device supply voltage andcontactor supply.www.comoso.com
