The 6SL3520-0XN03-0AF0 is the 3 kW AS-Interface variant in the fanless FSB frame — the highest-power G115D that combines two-wire bus communication with natural convection cooling. It delivers 7.7 A rated (15.4 A overload) from a 380–480 V 3-phase supply, connecting to the plant AS-i network with a single yellow cable for control, diagnostics, and status feedback.

AS-Interface at 3 kW — what the two-wire bus carries

The AF0 AS-Interface variant transmits drive commands (start/stop, speed setpoint, direction) and returns diagnostic data (current draw, temperature, fault codes) over two conductors. The AS-i cable does not carry motor power — the 380–480 V 3-phase supply and the 24 V DC control supply are separate circuits. For plants already standardized on AS-Interface with an installed AS-i master and cable infrastructure, adding a 3 kW G115D means connecting the yellow AS-i cable and the 3-phase power — no new fieldbus gateway, no Ethernet switch port, no additional network configuration. Up to 62 AS-i devices can share one segment, so multiple G115D AF0 drives at different power levels coexist on the same bus.

3 kW fanless: zero wear components, zero maintenance

The 3 kW FSB fanless (XN03/XH23/XM03) is the ceiling of passive cooling in the G115D range. Above 3 kW, every G115D variant requires an integrated cooling fan. The fanless FSB enclosure (425 × 180 × 134 mm, 7.12 kg) dissipates heat through natural convection — no fan to clog with dust, no bearings to wear, no fan to replace. Combined with the AS-Interface bus (which eliminates complex network hardware at the drive), the XN03 AF0 is the lowest-maintenance 3 kW distributed drive in the SINAMICS portfolio. The 24 V DC control supply draws 250–290 mA — roughly half the draw of fan-cooled variants.

XN03 vs. XH23 vs. XM03 — interchangeable across catalog generations

XN03, XM03, and XH23 are the same 3 kW fanless FSB hardware under different catalog designations. XM03 is the earliest, XN03 is intermediate, and XH23 is the current catalog code. Mounting dimensions, power/current ratings, and communication interfaces are identical across all three. When replacing a drive, any of the three can substitute directly as long as the communication variant matches.

Frequently Asked Questions

Does the AS-Interface variant support safety functions?

Yes — STO (Safe Torque Off) is implemented via a fail-safe digital input (F-DI). Unlike the PROFINET AB0 variant which provides PROFIsafe over Ethernet, the AF0 AS-Interface variant requires discrete safety wiring to the F-DI terminal in addition to the AS-i bus cable.

Can I use this drive for non-conveyor applications?

The G115D is designed and optimized for horizontal conveyor motion with sensorless vector control. For pumps, fans, mixers, or hoisting applications, the SINAMICS G120 cabinet-mounted series offers more flexibility in control modes and option boards.

What is the maximum number of G115D AF0 drives on one AS-i segment?

AS-Interface supports up to 62 standard slaves per segment. Multiple G115D AF0 drives at different power ratings can coexist on the same AS-i bus, each addressed as an individual slave. The AS-i master polls each drive sequentially for status and writes control commands.