The SINAMICS G115D 6SL3520-1XA22-2AF0 is the 2.2 kW wall-mounted distributed frequency converter in FSB frame with AS-Interface communication — the FSA-to-FSB transition point in the SINAMICS G115D series, configured for brownfield conveyor plants where the AS-i two-wire backbone is already installed. At 2.2 kW, the drive steps up from FSA to the larger FSB frame (425 × 180 × 134 mm, 7.12 kg) for sufficient natural convection cooling — no fan required. It delivers 5.9 A rated output current with 200% overload for 3 seconds, driving IE3 asynchronous or IE4 synchronous reluctance motors via direct SIMOGEAR 2KJ8 geared motor mounting. AS-Interface AF0 provides 4-bit cyclic I/O for speed setpoints and status feedback over the two-wire yellow AS-i cable, with STO via F-DI.

What does AS-Interface bring to the 2.2 kW FSB platform?

The AF0 variant connects the drive to any standard AS-Interface master over the two-wire yellow AS-i cable — the same cable that carries 24 V DC auxiliary power and communication to sensors, actuators, and I/O modules across the conveyor line. For plants with existing AS-i infrastructure, adding a G115D AF0 drive means connecting two wires — no Ethernet switches, no IP addressing, no network topology planning. The drive appears as a standard AS-i slave with 4-bit cyclic data exchange. Acyclic parameter access via AS-i 3.0 masters enables drive parameterization over the same two wires. At 2.2 kW — a common rating for merge units and accumulation conveyors — AS-Interface delivers sufficient control bandwidth for speed ramping and status monitoring without the overhead of a full fieldbus network.

Why does the frame step up from FSA to FSB at this power?

FSA natural convection is rated up to 1.5 kW. At 2.2 kW, the power stage generates heat beyond what the smaller FSA aluminum housing can passively dissipate. The FSB frame provides increased surface area for natural convection, maintaining fanless operation up to 3 kW — no fan, no moving parts, just a larger heatsink. For AS-i brownfield upgrades, this means the 2.2 kW drive drops into the same FSB mounting bracket as existing 2.2–4 kW drives, with the same motor connector and signal interfaces.

Frequently Asked Questions

Can I upgrade this drive to PROFINET later?

No — the communication interface is hardware-determined at order time. To migrate to PROFINET, replace with the AB0 variant. Motor, gearbox, and power connections remain unchanged.

How does STO work on this AS-Interface drive?

STO is achieved via the fail-safe digital input (F-DI) — a dedicated 24 V DC safety signal from an external safety relay or emergency stop circuit. This is the standard STO architecture for AS-Interface conveyor zones: the AS-i network handles process control, while a separate hardwired safety circuit handles STO. SIL 2 / PL d compliant.

What is the difference between 1XA22 and XH22?

Catalog designation only. 1XA22 (6SL3520-1X…) and XH22 (6SL3520-0X…) identify the same 2.2 kW FSB fanless hardware. Both support AA0, AF0, and AB0 variants. Drives are functionally interchangeable.