Siemens Actuator Servomotor SQN9 Series

Siemens Actuator Servomotor SQN9 Series – Burner Damper Control Actuator

Siemens Actuator Servomotor SQN9 Series is an electromotoric damper actuator designed to drive and control the position of air and gas dampers in small- to medium-capacity oil and gas burner systems. It adjusts combustion air and fuel flow according to the operating load requirements of the burner system.

The actuator uses a Reversible Synchronous Motor combined with a Gear Train and Adjustable Cams to provide controlled damper positioning. It offers a torque range of 0.8–2.4 Nm and a 90° running time of approximately 4–24 seconds, depending on the specific model. Selected versions support AC 230 V and AC 115 V power supplies. The SQN90 Series rotates counterclockwise, while the SQN91 Series rotates clockwise.

Siemens SQN9 Series can operate with compatible burner controllers, including Siemens LOA, LMO, LMG, and LFL, as well as P, PI, or PID control systems according to the supported control circuit configuration. It is suitable for industrial boilers, burner systems, and heating equipment requiring damper position control.

Key Features

• Reversible Synchronous Motor: Provides reversible motor operation for damper movement and position control.

• 0.8–2.4 Nm Torque: Suitable for driving dampers in small- to medium-capacity burner systems.

• 4–24 Seconds Running Time: Provides 90° rotation according to the specific model and operating conditions.

• Adjustable Cam Switches: Allow adjustment of End Switch and Auxiliary Switch operating positions.

• Internal Position Indication: Built-in position scale for checking and adjusting the actuator rotation angle.

• Maintenance-Free Gear Train: Designed to operate without routine gear train maintenance.

• Manual Disengagement: Allows manual disengagement of the gear train for drive shaft position adjustment.

• Heat-Resistant Housing: Durable plastic housing resistant to heat and mechanical impact.

Technical Specifications

• Brand: Siemens

• Series: SQN9 Series

• Product Type: Electromotoric Damper Actuator

• Motor Type: Reversible Synchronous Motor

• Torque: 0.8–2.4 Nm, depending on model

• Running Time: 4–24 seconds for 90° rotation, depending on model

• Angular Adjustment: Maximum 90°

• Power Supply: AC 230 V / AC 115 V, depending on model

• Frequency: 50–60 Hz

• Power Consumption: 8 VA

• Rotation Direction: SQN90 – Counterclockwise / SQN91 – Clockwise

• End Switches: 2

• Auxiliary Switches: Up to 3

• Position Adjustment: Adjustable Cams

• Electrical Connection: Screw Terminals

• Wire Cross-Section: 0.5–2.5 mm²

• Operating Temperature: -20 to +60°C

• Operating Humidity: Below 95% RH

• Safety Class: Class II according to DIN EN 60730

• Weight: Approximately 550 g

Applications

Siemens SQN9 Series is designed for controlling air and gas damper positions in oil and gas burner systems. It is suitable for combustion control applications in industrial boilers and heating equipment equipped with small- to medium-capacity burners. When integrated with compatible burner control systems, the actuator can adjust damper positions according to the burner operating sequence, including Low Fire and High Fire operating conditions.

Note: Before installation or replacement, verify the exact model number, supply voltage, torque, rotation direction, running time, and control circuit configuration to ensure compatibility with the existing equipment. Technical specifications may vary among Siemens SQN9 models.

Siemens SQN9 Series is a Damper Actuator designed for opening, closing, and adjusting the positions of air or gas dampers in burner systems. It operates through a gear train and Adjustable Cams, allowing the switching points of End Switches and Auxiliary Switches to be configured for controlling combustion air and fuel flow according to burner load requirements. The actuator supports integration with compatible Burner Controllers and P, PI, or PID control systems, such as the Siemens RWF40 Series. Its impact-resistant and heat-resistant plastic housing, combined with a maintenance-free gear train, provides reliable mechanical operation. The SQN9 Series is suitable for industrial boilers and heating equipment, with model selection requiring verification of the supply voltage, rotation direction, and control configuration.