Siemens SQM10.16502 Rotary Actuator – SQM10 Series

Siemens SQM10.16502 – Electromechanical Rotary Actuator for Precision Damper and Valve Positioning

The SQM10.16502 is a single-phase electromechanical rotary actuator within Siemens’ SQM10 product family, designed for deterministic angular positioning of air dampers, butterfly valves, and combustion air registers in both commercial HVAC and industrial burner management applications. Operating on a wide-range AC 100–240 V supply at 50/60 Hz, the unit delivers 1 Nm of output torque across a 90° mechanical travel arc, with a nominal running time of 150 seconds per full stroke. This combination of moderate torque and extended stroke time makes the SQM10.16502 particularly suited to applications where controlled, low-velocity damper movement is required to prevent pressure transients in duct networks or combustion chambers.

Unlike pneumatic actuators that depend on compressed-air infrastructure, the SQM10.16502 integrates its drive mechanism, auxiliary switching contacts, and position feedback into a single sealed enclosure rated IP54, eliminating the need for external positioners or solenoid valve banks. The two built-in SPDT auxiliary switches provide hardwired end-position signals directly to the building management system (BMS) or burner controller, enabling closed-loop confirmation of damper state without additional field wiring.

The actuator’s ambient operating range of –40 °C to +70 °C reflects a thermal design that accommodates both sub-arctic outdoor air-intake installations and high-ambient plant rooms adjacent to boiler stacks. At 1,771 g, the unit is mechanically robust without imposing excessive cantilever load on standard damper shaft assemblies.

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Technical Parameters

Hardware Logical Analysis

The SQM10.16502 employs a synchronous AC motor coupled to a multi-stage helical gear train. The synchronous motor topology is significant from a control-engineering perspective: rotational speed is locked to supply frequency (50 or 60 Hz), making stroke time deterministic and independent of load torque variations within the rated range. This eliminates the velocity drift that characterises DC-motor actuators under varying friction loads — a common failure mode in damper shafts that accumulate bearing wear or debris ingress over multi-year service cycles.

The gear train output shaft interfaces with the damper via a standard square-drive coupling, and mechanical end-stops are factory-set at 0° and 90°. The internal cam mechanism actuates the two SPDT auxiliary switches at user-adjustable positions within the travel arc, allowing the installer to define custom end-position thresholds without modifying the controller logic. This hardware-level adjustability reduces commissioning time in applications where the damper’s effective control range does not span the full 90° mechanical travel.

From an EMC standpoint, the SQM10.16502’s synchronous motor generates a predictable, narrow-band electromagnetic emission profile at the supply frequency and its harmonics. The enclosure’s IP54 rating — achieved through a gasketed polycarbonate housing — provides simultaneous protection against conducted interference ingress from adjacent variable-frequency drives (VFDs) and against radiated emissions coupling into adjacent signal wiring. In plant environments where multiple VFDs operate on the same distribution panel, this shielding characteristic is operationally relevant: the actuator maintains positional accuracy without requiring additional ferrite suppression on the supply leads.

The holding power of ≤ 1.5 W indicates that the motor is de-energised at end-of-travel and the position is maintained mechanically by the gear train’s self-locking ratio. This architecture prevents thermal stress accumulation in the motor windings during extended hold periods — a failure mode that affects continuously energised DC actuators in applications with infrequent cycling, such as seasonal damper positions in heat-recovery units.

System Integration Benefits

• Deterministic stroke timing: Synchronous motor operation ties running time directly to supply frequency, giving the BMS a predictable 150-second travel window for sequencing interlock logic without position-sensor feedback.
• Hardwired end-position confirmation: Dual SPDT auxiliary switches deliver binary position signals at AC 250 V / 3 A, compatible with direct wiring to PLC digital input modules without intermediate signal conditioning relays.
• Wide-voltage universality: AC 100–240 V acceptance eliminates the need for step-down transformers in 110 V North American installations or 220 V European and Asian sites, reducing BOM cost per installation point.
• Low standby thermal load: ≤ 1.5 W hold power across potentially hundreds of actuators in a large AHU array translates to measurable reductions in panel heat dissipation and cooling load on MCC enclosures.
• Extended temperature operability: The –40 °C lower limit allows deployment in outdoor air-intake dampers in northern climates without auxiliary enclosure heating, reducing infrastructure cost and maintenance points.
• IP54 ingress protection: Dust and splash resistance supports installation in plant rooms with periodic washdown cycles, eliminating the need for protective actuator covers that complicate maintenance access.
• Self-locking gear train: Mechanical position retention without continuous energisation prevents uncontrolled damper drift during power interruptions, maintaining last-commanded position and preserving system safety states.
• Cam-adjustable switch positions: Field-adjustable auxiliary switch trip points allow the same actuator model to serve multiple damper geometries across a project, reducing spare-parts inventory to a single SKU.
• Compact form factor: The actuator’s dimensional envelope is compatible with standard Siemens SQM10/SQM40 mounting brackets, enabling direct replacement of legacy units without damper shaft modification.
• Certified compliance: CE, UL, and cUL marks satisfy the documentation requirements of building permit authorities in the EU, USA, and Canada, streamlining project approval workflows.

Quality Assurance & Global Logistics

Every SQM10.16502 unit supplied through siemensplc.com is sourced from verified Siemens distribution channels with traceable batch documentation. Prior to dispatch from our Xiamen, China operations centre, each unit undergoes a three-stage verification protocol: visual inspection of housing integrity and factory seals, confirmation of label authenticity against Siemens’ current part-numbering schema, and electrical continuity verification of the auxiliary switch circuits. Units that do not pass all three stages are quarantined and returned to the supply chain — they are not offered for sale.

Packaging follows anti-static and shock-isolation standards appropriate for electromechanical assemblies: each actuator is individually bagged in anti-static polyethylene, cushioned with closed-cell foam inserts, and sealed in a double-wall corrugated carton. Tamper-evident tape is applied at all carton seams, providing the end customer with a clear visual indicator of shipment integrity upon receipt.

Logistics from Xiamen are executed via DHL Express, FedEx International Priority, and UCP air freight, with typical transit times of 3–5 business days to Southeast Asia, 5–8 business days to Europe and the Middle East, and 7–12 business days to the Americas. All shipments include a commercial invoice, packing list, and weight certificate. DDP (Delivered Duty Paid) terms are available for qualifying order volumes, eliminating customs clearance complexity for the buyer. A 12-month warranty against manufacturing defects is provided on all units, with DOA replacement processed within 5 business days of confirmed fault documentation.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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