SQM50.481R2Z3 Siemens Motor

Overview

The Siemens SQM50.481R2Z3 is a high-precision reversing actuator designed for the positioning of air and gas dampers, flow control valves, and butterfly valves. Part of the SQM5 series, this motor is specifically engineered for oil and gas burners of medium to large capacity. It is used for load-dependent control of combustion air, gas flow, and oil volume in connection with modulating controllers or burner controls. The SQM50 series is known for its high degree of modulating accuracy and repeatability, ensuring efficient combustion processes in industrial and commercial HVAC systems.

Features

• Reversible and locking-proof synchronous motor for reliable operation
• Eight internal, easily adjustable auxiliary switches for complex control sequences
• Auto/manual selector switch integrated for easy setup and manual adjustments
• Externally visible shaft position indicator for clear status monitoring
• Disengagement clutches for both the drive shaft and cam drum to allow manual positioning
• Low hysteresis actuator design with double-offset drive and potentiometer gearing for precision
• Field exchangeable circuit boards and potentiometers for versatile system integration
• Die-cast aluminum housing sections with impact-proof and heat-resistant plastic covers

Specifications

• Model: SQM50.481R2Z3
• Operating Voltage: 220-240 V AC (50/60 Hz)
• Torque: 140 in-lb (approximately 15 Nm)
• Running Time: 30 seconds for 90 degree rotation
• Rotation Angle: 90 degrees
• Switches: 2 end switches and 6 auxiliary switches (8 total)
• Shaft: 10mm round single-ended shaft with key
• Protection Rating: Engineered for industrial environments; typically IP54 rated depending on mounting
• Weight: Approximately 7.0 lbs (3.18 kg)

Applications

• Positioning of air and gas dampers in industrial burners
• Control of flow control valves and butterfly valves
• Load-dependent control for oil and gas burners of medium to large capacity
• Integration with Siemens burner controls (e.g., LMV5 or LME series)
• Use in HVAC systems, combustion processes, and thermal power plants requiring high modulating accuracy