The SINAMICS G115D 6SL3520-1XA22-2AA0 is the 2.2 kW wall-mounted distributed frequency converter in FSB frame with I/O Control — the FSA-to-FSB transition point in the SINAMICS G115D series 1XA catalog designation. At 2.2 kW, natural convection through the FSA enclosure is no longer sufficient for heat dissipation — the drive steps up to the larger FSB frame (425 × 180 × 134 mm, 7.12 kg) with greater aluminum surface area for passive cooling. 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. I/O Control (AA0) provides discrete digital inputs for run/stop/direction/fixed speeds, analog input for continuous speed reference, and F-DI for STO — the simplest control interface in the G115D lineup, with no fieldbus protocol to configure.

Why does the frame step up from FSA to FSB at 2.2 kW?

FSA (380 × 216 × 129 mm) relies on natural convection through its IP65-sealed aluminum housing — sufficient for heat dissipation up to 1.5 kW at 40 °C ambient. At 2.2 kW, the power stage generates more heat than the FSA surface area can passively dissipate. The FSB frame (425 × 180 × 134 mm) provides increased aluminum surface area for natural convection, maintaining fanless operation up to 3 kW. This is a passive thermal management upgrade — no fan, no moving parts — just a larger heatsink. For the machine builder, the 2.2 kW FSB uses the same mounting footprint as all other FSB variants, allowing a single bracket design across 2.2–4 kW conveyor zones.

When is I/O Control the right choice at 2.2 kW?

The AA0 I/O Control variant is purpose-built for applications where a fieldbus adds cost without operational benefit. At 2.2 kW — a common rating for merge conveyor zones and accumulation sections — three scenarios favor hardwired I/O: (1) the PLC cabinet is adjacent to the conveyor, making discrete wiring simpler than configuring a PROFINET or AS-i node; (2) the machine builder standardizes on terminal-block wiring across all drive sizes for commissioning simplicity; (3) the end user's maintenance team is trained on hardwired drive control and prefers not to introduce fieldbus diagnostics. The 1XA22 code identifies this as the 1XA series entry for 2.2 kW FSB I/O Control — paralleling the XH22 and XN02 codes in other catalog series.

What motors and gearboxes can it drive?

The 6SL3520-1XA22-2AA0 is optimized for direct mounting to SIMOGEAR 2KJ8 geared motors in IE3 or IE4 efficiency classes. Integrated 400 V AC brake control eliminates external brake contactors. Encoderless vector control supports both V/f control and sensorless vector control — speed reference from the analog input, parameterization via the SD card slot.

Frequently Asked Questions

Can I add a fieldbus to this drive later?

No — the communication interface is hardware-determined at order time. The AA0 variant has no fieldbus interface. To migrate to AS-Interface or PROFINET, replace with the AF0 or AB0 variant respectively. Motor, gearbox, and power connections remain unchanged.

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 — mechanically and electrically identical (5.9 A rated, 425 × 180 × 134 mm, natural convection). Both support AA0 and AF0 variants. Drives are functionally interchangeable; the prefix reflects commercial catalog organization.

Can this drive run at 40 °C ambient without derating?

Yes — fanless G115D variants are rated for continuous operation at rated output current up to 40 °C ambient without derating. Above 40 °C up to 55 °C, output current derating applies.