Siemens 6SL3244-0BB12-1FA0 Control Unit

The 6SL3244-0BB12-1FA0 is a power unit manufactured by Siemens, belonging to the SINAMICS G120 series and is a low-voltage AC frequency converter product type used in industrial automation drive systems. Specifically, the model number is CU250S-2 PN + PM240-2-1PH/2PH-12A. It is a core component of the SINAMICS G120 engineering-grade frequency converter system, designed specifically for driving small-power AC motors in single-phase/two-phase 230V AC power supply environments. It is widely used in industrial and building automation fields with high requirements for energy saving, control precision, and system integration, such as pumps, fans, conveyors, small machinery, and HVAC systems.

As a component of a modular frequency converter system, the 6SL3244-0BB12-1FA0 integrates two main parts:

Control Unit: CU250S-2 PN, equipped with a PROFINET communication interface, supporting industrial Ethernet connectivity.

Power Module: PM240-2-1PH/2PH-12A, rated output current 12A, suitable for single-phase or two-phase 230V AC input.

This combination constitutes a complete single-phase input, three-phase output variable frequency drive system, providing variable frequency speed control for three-phase AC asynchronous motors with rated voltage of 380–480V, achieving soft start, energy-saving operation, and precise speed regulation.

Product Core Parameters:

Input Voltage: 1AC/2AC 200–240V ±10%, 50/60 Hz

Output Voltage: 3AC 0–230V (Adjustable)

Rated Output Current: 12A (Constant Torque), 16A (Variable Torque, such as fan/pump loads)

Applicable Motor Power: Approximately 5.5kW (400V motor)

Control Method: V/f control, sensorless vector control (SVC), closed-loop vector control with encoder (optional)

Communication Interface: Standard PROFINET, supports IRT (Isochronous Real-Time), seamlessly integrates into Siemens TIA (Total Integrated Automation) architecture

Product Functions and Technical Features:
High-Performance Control Capabilities: The CU250S-2 control unit supports advanced sensorless vector control technology, providing up to 150% of rated torque at 0.5Hz, enabling low-speed, high-torque start-up, suitable for high-starting-torque loads. Supports multiple process functions such as multi-speed, PID regulation, ramp function, DC braking, and automatic restart.

Industrial Ethernet Integration

Built-in PROFINET interface, supporting high-speed, real-time communication with PLCs such as S7-1200 and S7-1500, enabling parameter reading/writing, status monitoring, fault diagnosis, and remote control. Supports the PROFIenergy protocol, reducing energy consumption in standby mode and complying with green manufacturing standards.

Modular Design and Flexibility
The SINAMICS G120 adopts a separate design for the control unit and power module, facilitating maintenance and upgrades. The 6SL3244-0BB12-1FA0 features a "booksize" structure with a compact width (120mm), supporting side-by-side installation (0mm gap), saving control cabinet space.

Comprehensive Protection Functions
Equipped with multiple protection mechanisms including overcurrent, overvoltage, undervoltage, overheating, short circuit, ground fault, and motor stall. Built-in RFI filter (Class A, downgradeable to Class C2), compliant with EMC standards, reducing electromagnetic interference.

Easy Operation and Debugging
Supports local parameter setting via BOP (Basic Operator Panel) or IOP (Intelligent Operator Panel). Graphical debugging via SINAMICS Startdrive software in the TIA Portal significantly improves engineering efficiency.

Highly adaptable to various environments: Operating temperature range is 0°C to +40°C (derating up to +50°C), IP20 protection rating, compliant with IEC/EN 61800-3, IEC/EN 61000, etc., suitable for industrial environments.

Applications: The 6SL3244-0BB12-1FA0 is particularly suitable for applications powered by a single-phase grid but requiring the drive of three-phase motors, such as small machinery, laboratory equipment, fan and pump systems in commercial buildings, and solar water pump control. Its PROFINET interface makes it ideal for networking and remote monitoring of equipment in smart factories and digital workshops.

Summary: The 6SL3244-0BB12-1FA0 is a high-performance, highly integrated SINAMICS G120 power unit, a modular drive system product in the low-voltage AC frequency converter category, specifically designed for three-phase motor control in single-phase power supply environments. As a core drive device for achieving energy-saving speed regulation and intelligent networking in modern industrial automation control systems, it plays a key role in improving system energy efficiency, realizing industrial Ethernet integration, and ensuring operational reliability. It is an important component for building intelligent and networked drive solutions.