The 6SL3520-1XH23-0AF0 is, in one product, the intersection of two G115D design boundaries: the highest fanless power rating in the series (3 kW, 15.4 A, natural convection only) and the PROFINET fieldbus interface that brings full TIA Portal visibility to a drive that requires zero cooling maintenance. The step to 4 kW adds both a fan and roughly double the 24 V DC consumption — this 3 kW unit is the last G115D that runs silently.

Why the 3 kW fanless is the one engineers notice

In any product range, the last model before a structural change carries disproportionate weight. For the G115D, 3 kW is that model. Every drive below it — FSA and FSB alike — is fanless; every drive above it requires forced-air cooling. An engineer sizing a conveyor motor at or below 3 kW can specify this drive and eliminate fan-related maintenance across the entire section. With PROFINET, the drive also reports its heatsink temperature to the controller — so if the passive cooling is ever insufficient due to ambient conditions or mounting orientation, the trend data flags it before a thermal trip occurs.

PROFINET at the fanless ceiling

The AF0 interface makes this drive a first-class PROFINET IO device. TIA Portal handles device naming, IP assignment, parameter download, and firmware updates in one engineering workflow. In operation, the drive streams speed, current, torque, DC-link voltage, and temperature to the controller — the same diagnostic depth as the 7.5 kW FSC flagship. For a conveyor line where uptime is the primary KPI, having the 3 kW mid-power drives report the same data as the main drives closes a visibility gap that hardwired-I/O variants leave open.