{"product_id":"9907-173-load-sharing-module-woodward","title":"9907-173 Load Sharing Module Woodward","description":"\u003cp\u003eThe \u003cstrong\u003eWoodward 9907-173\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e9907-173\u003c\/strong\u003e Load Sharing Module, operates as a dedicated hardware component for isochronous and droop load balancing within parallel generator control systems. The module senses 3-phase potential transformer (PT) and current transformer (CT) signals from generator buses, generating a +\/-3 VDC analog bias output signal to modulate speed governors and balance active real power distribution across multiple paralleled prime movers.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e9907-173\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eWoodward\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e273.6 mm x 59.2 mm x 214.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 deg C to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e5 W approximately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e115\/230 VAC (95-130 VAC or 190-260 VAC), 50-400 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePT Inputs\u003c\/td\u003e\n\u003ctd\u003e3-phase, 100-240 VAC line-to-line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCT Inputs\u003c\/td\u003e\n\u003ctd\u003e3-phase, 3-7 Arms at full load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Output\u003c\/td\u003e\n\u003ctd\u003e+\/-3 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDroop Range\u003c\/td\u003e\n\u003ctd\u003e0 to 10% speed reduction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnvironmental Rating\u003c\/td\u003e\n\u003ctd\u003eIP54, up to 95% RH (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShock Resistance\u003c\/td\u003e\n\u003ctd\u003e40 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003ePanel-mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eActuator Loop Feedback Response \u0026amp; Power Balancing\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eWoodward 9907-173\u003c\/strong\u003e computes total generator active power by processing instantaneous line voltage and current transformer inputs across a 50 Hz to 400 Hz frequency range. Internal analog control loops dynamically calculate load differentials relative to the paralleling bus, adjusting the +\/-3 VDC output to optimize actuator loop feedback response. This direct speed control biasing maintains tight power balance during load step transients without introducing system oscillation.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How is the power supply voltage range configured on the Woodward 9907-173 module?\u003c\/p\u003e\n\u003cp\u003eA: Terminal connections allow field selection between 115 VAC nominal (95-130 VAC operating band) and 230 VAC nominal (190-260 VAC operating band) power inputs across a 50 Hz to 400 Hz frequency spectrum.\u003c\/p\u003e\n\u003cp\u003eQ: What are the primary sensing transformer ratings required for proper operation?\u003c\/p\u003e\n\u003cp\u003eA: The sensing stage accepts 3-phase line-to-line PT inputs between 100 VAC and 240 VAC, paired with 3-phase CT secondary current inputs rated for 3 Arms to 7 Arms at maximum generator output.\u003c\/p\u003e\n\u003cp\u003eQ: What range of droop speed regulation is supported when operating in droop mode?\u003c\/p\u003e\n\u003cp\u003eA: The integrated droop potentiometer circuitry allows adjustment of generator speed reduction from 0% (isochronous operation) up to a maximum 10% speed droop for parallel utility grid operation.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify that all AC power supplies, PT lines, and CT circuits are de-energized and safely isolated prior to landing terminal wiring.\u003c\/li\u003e\n\u003cli\u003eConnect CT secondary lines through dedicated shorting blocks to ensure current transformers remain shorted during maintenance or installation.\u003c\/li\u003e\n\u003cli\u003eRoute analog signal output wiring and load sharing bus lines using twisted shielded-pair cable separate from AC power and high-voltage supply lines.\u003c\/li\u003e\n\u003cli\u003eTerminate cable shields at the panel earth grounding point only to avoid ground loop noise on the +\/-3 VDC analog output loop.\u003c\/li\u003e\n\u003cli\u003eSecure the chassis to the mounting panel using hardware with a minimum of 5-turn thread engagement to maintain physical stability under 40 g shock conditions.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":50743423435004,"sku":"9907-173","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/9907-1732.jpg?v=1785464630","url":"https:\/\/www.electronicplc.com\/ar\/products\/9907-173-load-sharing-module-woodward","provider":"Electronic PLC","version":"1.0","type":"link"}