{"product_id":"woodward-9907-345-electronic-overspeed-trip-device","title":"Woodward 9907-345 Electronic Overspeed Trip Device","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eWoodward 9907-345\u003c\/strong\u003e is an \u003cstrong\u003eelectronic overspeed trip device\u003c\/strong\u003e from the \u003cstrong\u003eProTech 203 Overspeed Protection System\u003c\/strong\u003e. It is designed to protect critical rotating equipment — including diesel engines, gas turbines, steam turbines, and other prime movers — from catastrophic overspeed conditions. This model features a \u003cstrong\u003ede-energize-to-trip\u003c\/strong\u003e configuration with \u003cstrong\u003ethree independent magnetic pickup units (MPUs)\u003c\/strong\u003e and a \u003cstrong\u003etwo-out-of-three (2oo3) voting relay architecture\u003c\/strong\u003e, providing fault-tolerant protection with high reliability.\u003c\/p\u003e\n\n\u003ch3\u003eKey Technical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Electronic Overspeed Trip Device\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e Woodward ProTech 203\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdentical Part Number:\u003c\/strong\u003e 8200-201\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrip Type:\u003c\/strong\u003e De-energize-to-Trip (low voltage DC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e 24 V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Range:\u003c\/strong\u003e 18–32 VDC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed-Sensing Frequency Range:\u003c\/strong\u003e 100 Hz – 32 kHz (250 Hz – 25 kHz per some sources)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMPU Failed Timeout Range:\u003c\/strong\u003e 100 – 25,000 rpm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -25°C to +60°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 19\" W × 12.244\" H × 5.62\" D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Less than 14 lbs (6.35 kg)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnclosure Rating:\u003c\/strong\u003e IP54, NEMA 4\/4X\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual Number:\u003c\/strong\u003e 85205\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSystem Architecture\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree Independent MPU Units (A, B, C)\u003c\/strong\u003e — each with dedicated CPU and speed-sensing circuitry\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-Out-of-Three (2oo3) Voting Relays\u003c\/strong\u003e — each unit controls 2 voter relays (6 total)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeparate Operator Interface\u003c\/strong\u003e per speed-sensing unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndependent 24V DC Power Supply\u003c\/strong\u003e per unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndividual CPU Status LEDs\u003c\/strong\u003e for each subsystem\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHot Replacement Capability:\u003c\/strong\u003e Subsystems can be replaced without tripping the prime mover (when supply power is disconnected first)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in Self-Test:\u003c\/strong\u003e Automatic diagnostic testing of all protection functions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemote Reset:\u003c\/strong\u003e Enables remote acknowledgment and reset of trip conditions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKey Lock:\u003c\/strong\u003e Prevents unauthorized parameter changes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple Alarm Outputs:\u003c\/strong\u003e Visual and audible alarms with LCD\/LED error messages\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCPU Failure Indication:\u003c\/strong\u003e Dedicated failure detection for each processing unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGas and steam turbine overspeed protection\u003c\/li\u003e\n\u003cli\u003eDiesel engine overspeed protection\u003c\/li\u003e\n\u003cli\u003eCompressor and pump drive protection\u003c\/li\u003e\n\u003cli\u003eMarine propulsion systems\u003c\/li\u003e\n\u003cli\u003ePower generation prime mover safety\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount in NEMA 4\/4X rated panel or enclosure\u003c\/li\u003e\n\u003cli\u003eConnect 24V DC power supply (18–32 VDC range)\u003c\/li\u003e\n\u003cli\u003eInstall three magnetic pickup sensors (MPUs) on prime mover shaft\u003c\/li\u003e\n\u003cli\u003eWire MPU signals to corresponding A, B, and C input terminals\u003c\/li\u003e\n\u003cli\u003eConnect trip relay outputs to fuel valve or steam valve trip solenoids\u003c\/li\u003e\n\u003cli\u003eConfigure overspeed setpoint and timeout parameters via operator interface\u003c\/li\u003e\n\u003cli\u003ePerform self-test and verify all three units show normal status\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between de-energize-to-trip and energize-to-trip?\u003c\/strong\u003e\u003cbr\u003eA: De-energize-to-trip removes power to trip the prime mover (failsafe). This configuration cannot be changed after purchase — verify your system requirements before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I replace a failed subsystem without shutting down?\u003c\/strong\u003e\u003cbr\u003eA: Yes, if you disconnect the supply power to that subsystem first. The remaining two units maintain protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How many voter relays does each unit control?\u003c\/strong\u003e\u003cbr\u003eA: Each of the three speed-sensing units controls 2 voter relays, for a total of 6 relays.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What enclosure rating is required?\u003c\/strong\u003e\u003cbr\u003eA: The unit is rated for IP54 \/ NEMA 4\/4X environments. Ensure your installation meets these requirements.\u003c\/p\u003e\n\n\u003ch3\u003eModel Selection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e9907-345 = \u003cstrong\u003eDe-energize-to-Trip \/ 24V DC \/ 2oo3 Voting \/ NEMA 4\/4X\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eVerify your prime mover requires \u003cstrong\u003ede-energize-to-trip\u003c\/strong\u003e (failsafe) vs. energize-to-trip\u003c\/li\u003e\n\u003cli\u003eConfirm 24V DC control power availability (18–32 VDC range)\u003c\/li\u003e\n\u003cli\u003eCheck MPU mounting location and cable routing for all three sensors\u003c\/li\u003e\n\u003cli\u003eFor alternative trip configurations, consult Woodward ProTech 203 ordering guide\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":53789782999224,"sku":"9907-345","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/9907-023_3.png?v=1784278481","url":"https:\/\/www.globalpetroparts.com\/products\/woodward-9907-345-electronic-overspeed-trip-device","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}