Siemens SIMODRIVE 611 Power Module 6SN1145-1AA01-0AA0

The Siemens SIMODRIVE 611 6SN1145-1AA01-0AA0 is a regenerative power supply module (infeed) designed for the SIMODRIVE 611 drive system. It supplies the DC link voltage for connected feed drives and spindle motors in CNC machine tools. This module supports both motor and regenerative operation, allowing energy recovery back to the mains during deceleration, significantly improving system efficiency. With a rated power of 55 kW, it is suitable for medium to large machining centers, lathes, and milling machines.

Technical Overview

The module operates on a 3-phase AC supply of 380-480V, 50/60Hz. It provides a regulated DC link voltage of 600V DC (nominal) with a peak current of 235 A. The regenerative braking capability returns up to 45 kW continuously, reducing the need for external braking resistors. The unit includes internal line reactor and RFI filter to meet EMC standards. Cooling is achieved via an integrated fan with a thermostatic switch. Operating temperature range: 0 to 40°C (derating above 1000m altitude).

Dimensions: 300mm H x 125mm W x 305mm D. Weight: approx 8 kg. Connection is via screw terminals for mains input, DC link output, and control terminals. The module also provides a 24V DC auxiliary supply output (1A max) for drive logic.

Key Features

• Rated power: 55 kW (DC link continuous power)

• Regenerative infeed with mains recovery

• Input voltage: 3-phase 380-480V AC ±10%

• DC link voltage: 600V DC (regulated)

• Peak DC link current: 235 A for 300 ms

• Integrated EMC filter and line reactor

• LED status indicators (power on, ready, fault)

• Overvoltage, undervoltage, overtemperature protection

System Integration

The 6SN1145-1AA01-0AA0 connects directly to the SIMODRIVE 611 DC link busbar, supplying power to multiple drive modules (e.g., 6SN1123, 6SN1124). It receives control signals from a SIMODRIVE 611 control module or the higher-level CNC (SINUMERIK 810D/840D). The module’s internal monitoring provides diagnostics for phase loss, short circuit, and ground fault. An external contactor and fuses must be installed upstream per Siemens guidelines.

Applications

Typical installations include heavy-duty CNC milling machines, turning centers, and grinding machines with multiple axes. The regenerative capability is especially beneficial in applications with frequent acceleration/deceleration, such as punching presses or high-speed machining. The module is also used in retrofit projects to replace older non-regenerative power supplies, reducing energy costs.

Installation and Cooling

Mounting is vertical inside a control cabinet with sufficient clearance for airflow. The integrated fan must have unobstructed intake and exhaust (minimum 80mm clearance). The module should be installed close to drive modules to minimize DC link inductance. Wiring must use shielded cables for control signals and appropriate gauge wires for mains input (e.g., 16 mm² recommended).

Diagnostics and Maintenance

LED indicators: green “Ready” indicates DC link voltage present; red “Fault” triggers for overtemperature, overcurrent, or mains failure. The module provides a relay contact for external fault signaling. Routine maintenance includes cleaning the fan filter every 6 months and checking terminal torque. The internal DC link capacitors have a typical service life of 10 years under normal load cycles.

Compatibility

This module is compatible with all SIMODRIVE 611 feed and spindle drives. It works with SINUMERIK 840D sl, 810D, and 840Di control systems using the appropriate interface module (e.g., 6SN1118). Firmware version of the control must support regenerative infeed. For older non-regenerative systems, parameter adjustments are required.

Conclusion

The Siemens SIMODRIVE 611 6SN1145-1AA01-0AA0 power module delivers reliable, efficient DC link power for multi-axis CNC applications. Its regenerative design reduces energy waste and thermal load on the machine, while robust protections ensure long-term reliability in demanding production environments.