SQM50.450R8G3 Siemens Damper Motor

Overview

The Siemens SQM50.450R8G3 is a high-precision reversing actuator designed for the accurate positioning of air dampers, gas dampers, and flow control valves in industrial and commercial burner applications. Part of the robust SQM5 series, this electromotive actuator is engineered for stability and repeatability in systems requiring rotary motion. It features a modular design that supports various electronic circuit boards, allowing it to integrate seamlessly with sophisticated burner control systems like the Siemens LMV5.

Features

• High modulating accuracy and rotational resolution for precise combustion control
• Integrated auto/manual selector switch and manual forward/reverse toggle for easy field adjustments
• Low hysteresis design with a double-offset drive and potentiometer gearing
• Five easily accessible and adjustable internal auxiliary switches for sequence control
• Externally visible shaft position indicator for quick status monitoring
• Durable die-cast aluminum housing with impact-proof, heat-resistant plastic covers
• Disengagement clutches for the drive shaft and cam drum to facilitate manual setup

Specifications

• Model: SQM50.450R8G3
• Torque Output: 140 in-lb (16 Nm)
• Running Time: 25 seconds for 90 degree rotation at 60 Hz (30 seconds at 50 Hz)
• Operating Voltage: 24 Vac (50/60 Hz)
• Input Control Signal: 4 to 20 mA (via AGA56.41A sub-module)
• Potentiometer: 1000 Ohm, 90 degree rotation
• Rotation Direction: Counterclockwise (CCW) default, field reversible to clockwise (CW)
• Shaft: No shaft included (must be ordered separately; supports various metric and fractional designs)
• Protection Rating: NEMA 1, 2, 3, 3R, 3S, 5, 12, and 13 (IP54 equivalent)
• Approvals: UL recognized, CSA certified, and CE approved

Applications

• Positioning of air and gas dampers in medium to large capacity oil and gas burners
• Load-dependent control of gas flow, oil volume, and combustion air volume
• Operation of butterfly valves and other flow control devices requiring rotary positioning
• Use in HVAC boiler systems, industrial furnaces, and thermal processing equipment
• Integration into burner management systems requiring precise air-fuel ratio control