SQM91.391A9 Siemens Actuator

Overview

The Siemens SQM91.391A9 is a high-performance electromotoric rotary actuator designed for the precise positioning of air and gas dampers, as well as oil pressure controllers. Specifically engineered for use with the Siemens LMV5 linkageless burner management system, this robust actuator facilitates electronic fuel-to-air ratio control in medium to large-capacity industrial burners. It features a modular design and a high-torque output, ensuring reliable, repeatable positioning for critical thermal process plants and complex combustion systems.

Features

• High torque output of 60 Nm (approximately 530 in-lb) for demanding industrial applications
• Integrated CAN bus communication interface for seamless integration with LMV5 burner controls
• Modular design allows for easier maintenance and individual component replacement
• Stepper motor drive ensures high-precision positioning with rapid response times
• Robust construction with a protection rating of IP66/NEMA 4 when properly fitted with M20 glands
• Hardened alloyed steel drive shaft with a 25mm diameter and keyed connection (DIN 6885)
• Designed for a service life of approximately 250,000 start cycles (roughly 10 years in normal heating mode)

Specifications

• Model: SQM91.391A9
• Rated Torque: 60 Nm (Nominal: 530 in-lb)
• Running Time: 30 seconds for 90 degrees (predefined by LMV5 unit)
• Operating Voltage: 24V DC (via CAN bus connection)
• Communication: CAN bus
• Protection Class: IP66 / NEMA 4
• Operating Temperature: -20 C to +60 C (-4 F to +140 F)
• Drive Shaft: 25 mm diameter with form-fitted key
• Weight: Approximately 15 lbs (6.8 kg)

Applications

• Supervision and control of air and gas dampers in industrial burners
• Precise regulation of oil volume and oil pressure controllers
• Integration into LMV5 linkageless burner management systems for electronic ratio control
• Medium to large-capacity oil and gas burners used in commercial and industrial heating
• Thermal process plants requiring high-torque rotary motion and repeatable accuracy