What makes this drive a cost-effective choice for basic conveyor applications?

The AA0 variant is the entry-level configuration in the SINAMICS G115D family. It delivers the same core drive platform — PROFINET and EtherNet/IP communication, sensorless vector control, 4 kHz pulse frequency — without the cost adder of an integrated C2 line filter or PROFIsafe safety communication. For conveyor installations where EMC compliance at C3 level is sufficient and safety is handled via hardwired F-DI inputs, this variant provides the full 4 kW of mechanical power at the lowest acquisition cost in the series. The drive integrates a 180 V DC motor holding brake output and an internal braking resistor (Rmin 80 Ohm for FSB), eliminating the need for external brake control hardware.

How does the forced-air cooling design support continuous conveyor duty?

At 4 kW, the FSB frame transitions from natural convection to forced-air cooling with an integrated fan. This is a design decision driven by thermal physics — 4 kW continuous output in a 425x180x169 mm enclosure generates approximately 173 W of power loss, which exceeds what natural convection can dissipate reliably at 40C ambient. The fan ensures the drive sustains full rated current (20.4 A) indefinitely without derating. For conveyor applications such as palletizers, merge conveyors, and incline belts that run near-continuous duty cycles, forced cooling eliminates the thermal bottleneck. The fan is monitored and serviceable without disturbing installed wiring, preserving the plug-in connector philosophy of the G115D platform.

What safety functions are included, and when should you consider upgrading?

The AA0 variant implements Safe Torque Off (STO) via a fail-safe digital input (F-DI), achieving SIL 2 / PL d / Category 3 per EN 61800-5-2. This is the standard safety architecture for distributed drives where a single safety relay or safety PLC output controls the STO function. If your application requires safety communication over PROFINET — for example, when STO must be triggered per drive in a multi-drive conveyor zone without running individual F-DI wiring to each unit — the AF0 variant with PROFIsafe is the appropriate upgrade. The SLS (Safely Limited Speed) function is available as a licensed option across all G115D variants and is not suffix-dependent.

Frequently Asked Questions

Does this drive require an external EMC filter for industrial installations?

The base G115D drive includes a Class A line filter per EN 55011, meeting C3 conducted emission limits. For installations on public low-voltage networks (Category C2 per EN 61800-3), an external line filter is required. If C2 compliance is needed without an external component, choose the AB0 or AF0 variant with the integrated C2 filter.

What is the maximum motor cable length with this drive?

Up to 15 meters of shielded motor cable is supported. The 4 kW FSB frame also supports up to 25 meters of unshielded cable in installations where radiated emissions are not a concern.

Can this 4 kW drive be daisy-chained with lower-power G115D units?

Yes. The G115D series supports daisy-chain power distribution so a single 400 V supply line can feed multiple drives. The 4 kW unit can serve as the first node in a daisy chain feeding downstream FSA and lower-power FSB drives. Total daisy-chain current must not exceed the supply connector rating.