Siemens Burner Servomotor SQM48.697B9

Product Details

The Siemens SQM48...B9 series represents the latest generation of heavy-duty stepper motor actuators designed specifically for the LMV5 Burner Management System. The "B9" designation indicates a significant technology shift from mechanical potentiometers to non-contacting Hall Effect sensors, which eliminates mechanical wear and ensures lifelong positioning accuracy. 1. Technical Specifications (B9 Series) Feature Specification Operating Voltage DC $24\text{V}$ (Powered via CAN bus from LMV5) Angular Resolution $0.1\text{°}$ (Industry-leading precision) Feedback Tech Hall Effect Sensor (Magnetic, non-contacting) Communication CAN bus (via RAST3.5 specialized connectors) Running Time Variable (Min $30\text{s}$ for $90\text{°}$, programmable via LMV5) Protection Class IP54 (Standard); IP66 with specific gaskets Housing Pressure die-cast aluminum (Lower) / Heat-resistant plastic (Cover) Ambient Temp $-20\text{°C}$ to $+60\text{°C}$ 2. All Models in the SQM48 B9 The SQM48 series is primarily divided by torque capacity and shaft configuration. Note that all B9 models are direct, "drop-in" replacements for their older A9 counterparts. Model Nominal Torque Holding Torque Drive Shaft SQM48.497B9 $20\text{ Nm}$ $20\text{ Nm}$ $14\text{ mm}$ with Woodruff key SQM48.697B9 $35\text{ Nm}$ $35\text{ Nm}$ $14mmwith Woodruff key Selection Tip: The SQM48.497B9 is the most common model for heavy air dampers, while the SQM48.697B9 is utilized for the largest industrial butterfly valves requiring maximum holding force. 3. Improvements: B9 vs. A9 Lifespan: Because the Hall sensor does not rely on a physical wiper moving across a plastic track (as the A9 potentiometer did), it does not develop "dead spots" over millions of cycles. Signal Stability: Magnetic sensing is less susceptible to the electrical noise or dust interference that could occasionally plague mechanical potentiometers. Reliability: The B9 series drastically reduces "Positioning Faults" in high-modulation burners where the actuator is constantly moving. 4. Operational Requirements Reference Run: Like all LMV5 actuators, a new SQM48 B9 must undergo a "Reference Run" during commissioning. The LMV5 drives the actuator to its mechanical stop to define the absolute zero point. CAN Addressing: Each actuator must be assigned a unique node address (e.g., Node 1 for Fuel, Node 2 for Air) using the AZL52 display unit. Wiring: Requiresthe AGG5.641 or AGG5.631 shielded 5-core CAN bus cable to ensure safety-critical communication is not interrupted by EM interference. 5. Maintenance  Gears: The spur gear drive is permanently lubricated and maintenance-free. Manual Overriding: Never attempt to rotate the shaft manually while the actuator is powered. Unlike the SQN series, there is no manual clutch. Any forced movement can damage the internal stepper motor logic or gears.