SM3 109-525-2237A-6

The SM3 109-525-2237A-6 from Bosch Rexroth Indramat is a high-performance AC inverter within the SM AC Inverters series, designed to meet demanding industrial automation requirements. This unit delivers a rated current of 50 A and supports a peak current of 100 A, providing robust power management for medium-duty servo motors. Its compact footprint and rack-mounted form factor suit space-constrained control cabinets, while the forced ventilation cooling mechanism ensures consistent thermal performance. Engineered for reliability, the SM3 inverter operates stably within ambient temperatures from 0°C to +55°C and has storage temperature tolerance down to -25°C.

In technical terms, the inverter’s DC link voltage of 460 V to 700 V enables versatile power conversion, and its speed regulation range greater than 1:10000 delivers precise motion control across wide dynamic demands. The device maintains a maximum power loss of 350 W under full load, ensuring efficient energy handling during continuous operation. Command signals are managed via a Command input Sw1 differential ±17 V to ±11 V interface, while the Enable input (24 V opto-coupler) provides safe and reliable drive activation. The integrated blower assembly runs on 24 V DC at 100 mA, supporting the inverter’s forced ventilation (1 axial blower) cooling system.

Operational resilience is built on a current reduction rate of 1.2%/K above 45°C ambient, which safeguards the inverter against thermal overloads in harsh environments. The unit’s Insulation class F rating and Ingress protection IP00 classification ensure the internal electronics are robustly insulated, albeit requiring installation in enclosed control panels for dust and moisture safety. An internal slope limitation feature prevents abrupt current surges, promoting longevity of both inverter and connected motors. This inverter functions reliably up to a maximum operating altitude of 1000 m above MSL, making it suitable for a range of factory floor elevations.

Integration into automation systems is simplified through its multiple connection headers, including the Enable input and Command input Sw1, as well as native compatibility with standard TTL incremental encoders up to 2048 PPR resolution. The rack-mounted chassis form factor complements modular control architectures, and the inverter’s precise speed regulation supports synchronized multi-axis motion applications. As a core component of Bosch Rexroth Indramat’s SM AC Inverters series, the SM3 109-525-2237A-6 excels in machine tool control, packaging lines, robotic systems, and other industrial automation installations requiring dependable, high-fidelity servo drive performance.