SQM45.291A9 Siemens Actuator

Overview

The Siemens SQM45.291A9 is a high-precision electromotoric actuator designed for the load-dependent control of gas and air dampers, as well as oil control valves on industrial burners. Engineered for use with the Siemens LMV5 burner management system, this actuator provides critical accuracy for linkageless fuel-air ratio control. While it has been officially discontinued and replaced by the SQM45.291B9, it remains a standard component in many existing medium to large-capacity combustion and thermal process plants.

Features

• Stepper motor drive ensures high-precision positioning and repeatable control
• CAN bus communication interface for seamless integration with LMV5 basic units
• Spur gear drive constructed of high-grade plastic with permanent lubrication and low backlash
• Robust housing with a protection rating of IP54 (when properly installed with M16 glands)
• Compact design allows for flexible mounting positions on various burner configurations
• Integrated drive shaft with a Woodruff key for secure mechanical coupling

Specifications

• Model: SQM45.291A9
• Operating Voltage: AC 2 x 12 V via bus cable or separate transformer
• Nominal Torque: 3 Nm (27 in-lb)
• Holding Torque: 1.5 Nm
• Running Time: 10 seconds for 90 degrees
• Rotation Angle: Max. 90 degrees
• Drive Shaft: 10 mm diameter with Woodruff key
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 1.0 kg (2.2 lbs)

Applications

• Load-dependent control of combustion air volume in gas and oil burners
• Precise regulation of gas flow and oil volume in industrial thermal process plants
• Integrated operation within the Siemens LMV5 linkageless burner management system
• Suitable for medium and large-capacity burners requiring high-accuracy ratio control