The SINAMICS G115D 6SL3520-1XA02-2AB0 marks the transition from FSA to FSB frame in the G115D distributed drive family. At 2.2 kW, natural convection in the compact FSA envelope (380 × 156 × 129 mm) is no longer sufficient — the drive steps up to the larger FSB frame (425 × 180 × 134 mm) with its greater heatsink surface area. The result: 5.9 A continuous and 11.8 A overload from a fanless design that weighs 7.12 kg.

Why does the frame change at 2.2 kW?

The FSA frame's heatsink can reject roughly 60–80 W of losses — adequate for 0.37–1.5 kW drives. At 2.2 kW / 5.9 A, IGBT switching losses exceed this limit. The FSB frame's larger heatsink (45 mm wider, 24 mm taller) increases the natural convection surface area by approximately 60%, bringing the thermal equilibrium back within safe limits. The trade-off is a larger wall footprint: 425 × 180 mm vs 380 × 156 mm. For conveyor designs where space is constrained, verify that the FSB dimensions fit the mounting location before specifying 2.2 kW.

What does PROFINET with PROFIsafe provide?

The AB0 variant integrates PROFINET IO and PROFIsafe on a single Ethernet connection. Speed reference, actual values, diagnostics, and STO safety commands all travel over one cable — no separate safety wiring loop. The built-in 2-port switch supports daisy-chain topology: Drive 1 → Drive 2 → Drive 3, reducing the number of switch ports and cable runs. MRP ring redundancy protects against single cable failures. EtherNet/IP is also supported for plants with non-Siemens controller architectures.

Which applications suit the 2.2 kW FSB?

This is the workhorse rating for general conveyor zones: roller beds, belt conveyors, accumulation zones, and diverters handling moderate product weights. At 5.9 A continuous, it pairs well with SIMOGEAR 2KJ8 geared motors in helical or parallel-shaft configurations. The fanless design means zero fan maintenance and silent operation — valuable in operator-adjacent lines, food packaging, and cleanroom-adjacent zones.