The Siemens SINAMICS G115D 6SL3520-0XK05-5AA0 is a 5.5 kW wall-mounted distributed frequency converter with digital and analog I/O terminal control, designed for medium-power standalone conveyor drive applications. The 26.4 A output drives mid-range SIMOGEAR 2KJ8 geared motors for horizontal conveying. The IP65/IP66-rated FSB enclosure mounts directly on the machine frame, eliminating control cabinet space and cooling infrastructure.

How Is Speed and Direction Controlled via I/O Terminals?

This -5AA0 variant uses onboard digital inputs for run enable, direction, fault reset, and up to three fixed-speed selections (binary-coded, supporting 8 preset speeds). The analog input accepts 0–10 V or 4–20 mA for continuous speed reference from a potentiometer or PLC analog output. A digital output provides fault indication, and a relay output signals drive-ready status. This terminal-based interface is ideal for conveyor sections that operate autonomously without a fieldbus network.

What Are the Installation Requirements?

The FSB frame measures 425 × 240 × 169 mm (W×H×D) and mounts directly on the machine frame or wall. The IP65/IP66/UL Type 4X enclosure withstands washdown and dusty environments without a cabinet. The operating ambient temperature range is −30 °C to +40 °C, extendable to +55 °C with derating. Forced-air cooling maintains thermal performance. The integrated Category C2 EMC filter ensures compliance with IEC 61800-3 without external filtering.

Motor Compatibility and Control

The drive is optimized for SIMOGEAR 2KJ8 geared motors with IE3 asynchronous or IE4 synchronous reluctance motors. Control modes range from simple V/f for basic speed regulation to encoderless vector control for applications requiring precise torque at low speeds. The integrated brake chopper (180 V DC) manages motor holding brakes directly. Overload capability reaches 200% for 3 seconds, supporting conveyor start-up surges under load.

Frequently Asked Questions

How are multiple fixed speeds configured without a fieldbus?

The drive supports up to 8 preset speeds selected via three digital inputs using binary coding. Each preset speed is configured as a drive parameter — for example, a slow jog speed for maintenance, a normal running speed, and a high-speed return. The speed values are set during commissioning via the keypad or the SINAMICS Smart Access Module (SAM) web server and stored in the drive non-volatile memory.

Can this drive accept a speed reference from an external PLC without fieldbus?

Yes. The analog input accepts a 0–10 V or 4–20 mA signal from any PLC analog output module, motorized potentiometer, or standalone speed controller. The start/stop signal can come from the PLC digital output or directly from field devices such as pushbuttons, limit switches, or photoelectric sensors. This allows integration into simple PLC-controlled systems without the complexity of fieldbus configuration.