Siemens SQM10.16562 Reversible Servo Motor Actuator

Siemens SQM10.16562 Reversible Electromotoric Servo Actuator

The Siemens SQM10.16562 is an industrial-grade, reversible electromotoric servo actuator engineered for high-precision positioning of air dampers, oil metering units, and gas control valves in medium-to-large oil and gas combustion systems. Driven by a locking-proof synchronous motor coupled to a self-lubricating, heavy-duty reduction gear train, the SQM10.16562 ensures repeatable angular positioning and linear fuel-to-air stoichiometry under severe thermal, mechanical, and marine engine-room vibrations.

Featuring adjustable internal cam switches and auxiliary microswitches with high switching capacities, this actuator integrates with load controllers, burner management systems (e.g., Siemens LFL, LMV, LFE, LGK series), and 3-point step or modulating control loops.

Model Details

• Manufacturer: Siemens AG
• Product Line: SQM1x Series Electromotoric Actuators
• Full Model / Type Reference: SQM10.16562
• Factory Part Number (MPN): BPZ:SQM10.16562 / SQM10.16562
• Shaft Configuration: 10 mm standard cylindrical keyed drive shaft
• Operating Profile: Counterclockwise (CCW) standard rotation (facing drive shaft), 29 seconds for 90° angular stroke
• Internal Wiring Diagram: Circuit Diagram No. 2 (H 4 318 1522 0)

Key Features

1. Locking-Proof Synchronous Drive: Operates at a constant speed independent of variable mechanical load and mains fluctuation until mechanical limits or switch trip points are engaged.
2. High Torque Rating: Delivers 10 Nm nominal operating torque with up to 15 Nm breakaway/starting torque and 7 Nm holding torque to prevent damper back-drafting.
3. Integrated Cam Bank: Equipped with 2 primary limit switches and 5 auxiliary microswitches (SPDT) rated at 10 (3) A at 250 VAC for auxiliary interlocks, valve proof-of-closure, and burner sequencing.
4. Disengageable Gear Train: Features a manual clutch mechanism allowing field engineers to disengage the gear transmission for rapid commissioning, valve stroke calibration, and zero-point alignment.
5. Rugged Housing Construction: Built with a die-cast aluminum base frame and an impact-resistant, heat-stabilized polycarbonate enclosure meeting IP54 environmental ingress standards.

Industrial Applications

• Marine Auxiliary & Main Boilers: Precise modulation of forced draft (FD) combustion air dampers on marine package boilers (Aalborg, KangRim, Saacke, Miura, Volcano).
• Industrial Burner Fuel-to-Air Control: Linear positioning of gas butterfly valves and heavy fuel oil (HFO/MDO) regulating valves on Weishaupt, Riello, Oilon, and Nu-Way dual-fuel burners.
• Thermal Fluid Heaters & Incinerators: Accurate actuation of flue gas recirculation (FGR) and primary combustion air flaps in process heaters and marine shipboard waste incinerators.
• Rotary Kilns & Industrial Furnaces: Direct coupling to flow regulation valves requiring 10 Nm holding torque to prevent flame instability.

Part Number Cross-References & Alternates

• Siemens / Landis & Gyr: SQM10.16562 / BPZ:SQM10.16562
• Nu-Way Part Number: 054.341 (Model SQM10.16562 – 240V)
• Direct Clockwise Alternative: SQM11.16502 / SQM11.16562 (CW rotation variant)
• Heavy Duty Alternative (20 Nm): Siemens SQM20.16502 / SQM20.18502 (12 mm shaft diameter)

Frequently Asked Questions

What is the difference between Siemens SQM10 and SQM11 actuators?

The primary difference is the direction of rotation when facing the output drive shaft. The SQM10 series rotates counterclockwise (CCW) when control voltage is applied to terminal 1, whereas the SQM11 series rotates clockwise (CW). Both series share identical mounting footprints and electrical switch ratings.

Can I install an electronic feedback potentiometer on the SQM10.16562?

Yes. The SQM10.16562 housing accommodates standard Siemens ASZ… series wire-wound or conductive plastic potentiometers. They mount directly above the cam stack on the main drive shaft to provide 0–135 Ω, 0–1000 Ω, or dual 4–20 mA converted position feedback to PLC or BMS units.

How do I configure the 5 auxiliary switches on the SQM10.16562?

Each auxiliary switch is actuated by an independently adjustable cam disk. Setting scales located beside the cams indicate the switching position in degrees. By turning the cam adjusters with the supplied adjustment tool, you can set switching points anywhere between 0° and 160° for ignition position interlocks, heavy oil valve enablement, or external status indicators.

Can the SQM10.16562 replace an older Landis & Gyr SQM10 actuator?

Yes. Siemens acquired Landis & Gyr, and the SQM10.16562 is the direct form, fit, and functional replacement for legacy Landis & Gyr SQM10.16562 units, maintaining identical terminal numbering, mechanical shaft dimensions, and electrical parameters.