The 6SL3520-0XM04-0AA0 is the I/O Control variant of the SINAMICS G115D at 4 kW — the largest power rating in the wall-mounted range. Delivering 20.4 A peak output in the FSB frame with integrated fan cooling, it powers heavy conveyor sections with hardwired terminal control — no fieldbus, no network, just direct I/O at high power. The FSB frame with fan measures 425 × 180 × 169 mm.

Why does the 4 kW XM04 have a fan while lower-power G115D variants do not?

At 4 kW, the power dissipation exceeds natural convection capacity in the compact FSB enclosure. An integrated fan provides forced-air cooling, enabling continuous 4 kW operation in the 425 mm wide wall-mounted footprint. The fan adds 35 mm to the depth (169 mm) and increases the 24 V DC control supply from 250 mA (fanless FSB) to 510 mA for the I/O Control variant. The fan is field-replaceable.

What makes the I/O Control variant different from PROFINET and AS-Interface?

The I/O Control variant (AA0 suffix) uses 4 programmable digital inputs and 2 configurable digital I/O channels for direct hardwired control. There is no fieldbus — the drive starts and stops on terminal signals. At 4 kW, this suits large standalone conveyor sections or replacement of high-power contactor-controlled motors where adding a network node adds complexity without benefit.

What motors can the G115D at 4 kW drive?

The drive is preconfigured for SIMOGEAR 2KJ8 geared motors in frame sizes 71–132 (IE3 async or IE4 synchronous reluctance). At 4 kW, it handles main conveyor trunk lines, incline belts, and heavy accumulation zones. The integrated braking circuit supports a minimum external resistance of 80 Ω. Motor cable length is up to 15 m at 4 kHz.

What safety functions are available on the I/O Control variant?

Safe Torque Off (STO) is activated via the fail-safe digital inputs (F-DI) — two of the drive's four digital inputs can be configured as F-DI channels, achieving SIL 2 (IEC 61508) and PL d Cat 3 (EN ISO 13849-1). PROFIsafe is not available on this variant — it requires the PROFINET variant (AB0).

Frequently Asked Questions

Does the 4 kW XM04 require a control cabinet?

No. Like all G115D drives, the XM04 mounts directly on the machine frame with IP65/IP66 protection. The integrated fan is sealed within the IP65 housing.

Can the I/O Control variant be upgraded to fieldbus later?

No. The communication interface is hardware-defined. To add fieldbus, replace the drive with the corresponding AA0/AB0/AF0 variant. All share the same FSB frame, mounting pattern, and motor compatibility.

Is 4 kW the largest G115D wall-mounted drive available?

Yes. 4 kW is the maximum rating in the G115D wall-mounted range. For higher power requirements above 4 kW, Siemens offers the G115D in a separate wall-mounted variant or the G120 series in control-cabinet format. The 4 kW XM04 covers the vast majority of horizontal conveyor applications up to the heaviest individual belt sections.