The jump from 1.5 to 3 kW is where distributed drives traditionally fall away — heavier motors mean more heat than a convection-cooled wall housing can pass. The 2XH24-0AF0 build of the SINAMICS G115D bridges it with a fan: 4 kW in LO duty (10.2 A rated, 20.4 A HO) in the FSB frame, PROFINET and EtherNet/IP onboard, and the same gland-plus-24 V PSU wiring scheme as the whole 2XH family.

What changes when the drive moves from convection to fan cooling?

The mounting rules get one new entry: keep the fan intake clear. Everything else about the wall-mount concept survives intact — the 425 x 240 x 169 mm housing stays IP65/66 / UL Type 4X sealed, power enters through the gland, and the integrated 24 V PSU feeds the local controls. The fan is what allows 20.4 A in HO duty from a housing this size, which is the difference between a cabinet build and a frame-mount build at 4 kW.

Where does the 4 kW tier sit in a conveyor architecture?

On the sections that carry real tonnage — incline belts, heavy transfer points, mainline accelerators — but not yet the constant-load main transport that belongs to the 5.5-7.5 kW FSC builds. The PROFINET port brings those sections into the plant network with preconfigured TIA integration, EtherNet/IP covers mixed-vendor monitoring, and if the load creeps up, the 5.5 kW 2XH25 build takes the same wiring plan one frame class up. The 200%/3 s starting envelope and integrated C2 filter carry over unchanged.