800123-2S is a two-speed flange-mounted rotary resolver manufactured by Reliance Electric, matched with GV3000 series AC drives and high-performance servo drive systems for motor rotor position and rotational speed real-time detection. It is a contactless electromagnetic position feedback sensor co-developed with Tamagawa, widely used as original replacement spare for closed-loop vector control system renovation and breakdown maintenance of legacy Reliance drive equipment on industrial production lines.

800123 stands for Reliance unified base part coding of standard industrial resolver product family. 2 represents two-speed internal winding structure design for double pole feedback collection. S denotes flange mounting installation form with single output shaft and MS twist-lock quick connector configuration, differing from R code foot-mounted resolver specification.

Rated excitation input voltage is 26VAC with standard excitation frequency at 2400Hz. It adopts two-speed winding layout to output dual sets of sine and cosine analog feedback signals corresponding to mechanical rotation angle. Operating temperature ranges from -20℃ to +70℃, mechanical protection grade IP54 against dust and splashing liquid, single solid output shaft structure with standard industrial flange mounting dimension, anti-vibration design to endure frequent variable speed startup and impact load working condition, original made in United States with Tamagawa internal core winding component.

Equipped with dedicated MS twist-lock locking aviation connector for wiring connection to drive control board resolver signal terminal, no fieldbus digital communication interface integrated. Excitation input wiring and two groups of analog feedback signal wiring are separated inside the connector pin definition to avoid signal crosstalk, all analog position signals are directly transmitted to drive main control board via hardwire connection for closed-loop operation calculation.

Converts motor mechanical rotation angle into proportional analog sine and cosine electrical signals through electromagnetic induction principle, feeds back real-time rotor position and rotating speed data to host AC drive control unit continuously. Two-speed winding structure improves low-speed detection precision to ensure stable high starting torque output under heavy-load startup condition of vector controlled motor, cooperates with drive controller to execute closed-loop speed regulation and overspeed, phase-loss protection logic judgment for drive system safety operation.

Mainly configured for closed-loop speed control of heavy-load conveyor motor, extruder main drive motor, printing roller servo motor and textile spinning machine dragging motor matched with Reliance GV3000 inverter and legacy DC servo drive units. Applied for old production line resolver failure replacement and spare part inventory stocking of automation equipment maintenance department.

Cut off all drive main power supply and wait for internal DC bus voltage full discharge before resolver disassembly and replacement to prevent high voltage damage during wiring operation. Check connector fastening status and cable insulation integrity every six months, clean dust accumulated on resolver shell surface with dry compressed air without dismantling internal winding structure. After drive reports speed feedback fault, inspect excitation input voltage and analog feedback signal continuity to judge resolver winding open or short circuit failure. Store unused spare resolver in dry storage environment with ambient humidity below 60 percent to avoid internal coil damp and insulation aging.