The 6SL3520-2XA63-0AF0 is the highest-power fanless drive in the SINAMICS G115D family. At 3 kW, it is the last G115D variant cooled entirely by natural convection — one step beyond, at 4 kW, an integrated fan becomes mandatory. This is a meaningful threshold for conveyor applications where fan noise, fan reliability, or control-panel 24 V DC power budget is a concern. The FSB enclosure at 425 × 180 × 134 mm is 35 mm slimmer than its fan-cooled counterpart, with no moving parts in the cooling path.

Why does fanless matter at 3 kW?

No fan means no fan bearing to wear out, no fan to clog with textile dust or cardboard fibers, and no fan noise added to the machine's acoustic profile. The 24 V DC auxiliary supply draw drops to approximately 250 mA — roughly half the consumption of a fan-cooled equivalent — leaving more headroom in the control panel power budget for sensors and I/O. For food-packaging conveyors subject to regular washdown, a sealed passive heatsink eliminates the one moving part most likely to fail in a wet environment.

How does PROFINET integrate with this fanless platform?

The AF0 suffix brings PROFINET IO, PROFIsafe, and EtherNet/IP via M12 D-coded dual-port connectors. The integrated 2-port switch supports daisy-chain topology — each drive uplinks to the next without external switches — and MRP ring redundancy for fault-tolerant conveyor networking. PROFIsafe transmits the STO signal over the same PROFINET cable, so safety and motion run on one network.