{"product_id":"9905-387-woodward-proact-digital-driver-new-original-stock","title":"9905-387 Woodward ProAct Digital Driver | New \u0026 Original Stock","description":"\u003ch1\u003eWoodward 9905-387 ProAct Digital Driver III and 2301D Speed Control Unit\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eWoodward 9905-387\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e9905-387\u003c\/strong\u003e Digital Speed Control Unit \u0026amp; ProAct Driver, serves as the primary \u003cstrong\u003e9905-387\u003c\/strong\u003e Actuator Driver and Speed Governor utilized to execute precise electronic fuel metering and valve positioning across industrial turbine and engine platforms.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"1\"\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"1\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"2\"\u003eModel\u003c\/td\u003e\n\u003ctd data-row=\"2\"\u003e9905-387\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"3\"\u003eBrand\u003c\/td\u003e\n\u003ctd data-row=\"3\"\u003eWoodward\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"4\"\u003eOrigin\u003c\/td\u003e\n\u003ctd data-row=\"4\"\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"5\"\u003eWeight\u003c\/td\u003e\n\u003ctd data-row=\"5\"\u003e2.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"6\"\u003eDimensions\u003c\/td\u003e\n\u003ctd data-row=\"6\"\u003e300 x 200 x 80 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"7\"\u003eOperating Temp\u003c\/td\u003e\n\u003ctd data-row=\"7\"\u003e-40 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"8\"\u003ePower Consumption\u003c\/td\u003e\n\u003ctd data-row=\"8\"\u003e15 W typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"9\"\u003eInput Power\u003c\/td\u003e\n\u003ctd data-row=\"9\"\u003e18 to 32 VDC (24 VDC nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"10\"\u003eSpeed Signal Input\u003c\/td\u003e\n\u003ctd data-row=\"10\"\u003eMagnetic Pickup (MPU) or Proximity Sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"11\"\u003eSignal Output\u003c\/td\u003e\n\u003ctd data-row=\"11\"\u003e4-20 mA analog outputs for remote monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"12\"\u003eSerial Interfaces\u003c\/td\u003e\n\u003ctd data-row=\"12\"\u003eRS-232, RS-422, or RS-485 interfaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"13\"\u003eCommunication Protocols\u003c\/td\u003e\n\u003ctd data-row=\"13\"\u003eModbus RTU network architecture\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eActuator Loop Feedback Response and Dynamic Control\u003c\/h3\u003e\n\u003cp\u003eThe hardware features an integrated processing unit configured for V\/Hz profiles and field-oriented digital control algorithms. It directly dictates the actuator loop feedback response by calculating discrete speed changes via high-frequency Magnetic Pickup Unit (MPU) inputs up to 10,000 RPM. The internal control logic executes parallel load sharing, isochronous balancing, and droop compensation loops. Thermal heat sink dissipation profiles are integrated into the heavy-duty chassis construction, maintaining steady gate-drive switching loops and preventing thermal drift under maximum inductive actuator loads.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What are the restrictions regarding the maximum physical cable length between the magnetic pickup sensor and the input terminals of this module?\u003c\/p\u003e\n\u003cp\u003eA: To maintain proper speed loop feedback response and minimize harmonic distortion suppression errors, the MPU signal line must not exceed standard engineering limits and must use twisted-shielded instrumentation cables.\u003c\/p\u003e\n\u003cp\u003eQ: Can the 9905-387 module be serviced or calibrated while the turbine speed control loop is active?\u003c\/p\u003e\n\u003cp\u003eA: No. Altering internal control parameters via the serial link during operation will cause immediate step changes in the actuator output loop, risking severe mechanical overspeed faults or an immediate emergency trip.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the control unit vertically inside a protective metal cabinet using the designated mounting hole layout to maximize convective air flow over the thermal heat sink.\u003c\/li\u003e\n\u003cli\u003eRoute all 24 VDC power supply wires through separate conduits away from low-level magnetic pickup (MPU) lines and serial communication cables.\u003c\/li\u003e\n\u003cli\u003eTerminate all communication and feedback shields only at the specified system grounding bus bar to prevent ground loop noise from corrupting data.\u003c\/li\u003e\n\u003cli\u003eEnsure all terminal block terminal screws are torqued properly to maintain structural integrity under continuous engine vibration profiles.\u003c\/li\u003e\n\u003cli\u003eConfigure the 4-20 mA feedback loop parameters using Woodward 505View or OpView software before completing the mechanical connection to the fuel valve actuator.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":42870866116698,"sku":"9905-387","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/81._73cb69d0-6c43-49a6-910a-8cd87beeda95.jpg?v=1770949428","url":"https:\/\/www.spareoil.com\/products\/9905-387-woodward-proact-digital-driver-new-original-stock","provider":"SpareOil Automation","version":"1.0","type":"link"}