{"product_id":"9905-068-woodward-overspeed-protection-module-new-original-stock","title":"9905-068 Woodward Overspeed Protection Module | New \u0026 Original Stock","description":"\u003ch2\u003eWoodward 9905-068 ProTech-GII Overspeed Protection Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eWoodward 9905-068\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e9905-068\u003c\/strong\u003e TMR Module, operates as a dedicated hardware component for absolute overspeed protection within ProTech-GII Overspeed Protection platforms.\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\u003e9905-068 (Revision N)\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\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e28.5 cm x 11.4 cm x 24.8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eNominal 24 VDC (Accepts 18-32 VDC redundant supply inputs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Architecture\u003c\/td\u003e\n\u003ctd\u003eTriple Modular Redundant (TMR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrip Execution Logic\u003c\/td\u003e\n\u003ctd\u003eEnergize-to-Trip (ETT) configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoting Logic\u003c\/td\u003e\n\u003ctd\u003eHardware-based 2-out-of-3 (2oo3) execution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse Time\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 12 ms total hardware trip execution path\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed Inputs\u003c\/td\u003e\n\u003ctd\u003e3 independent channels (Supports passive MPU, active, or Hall-effect sensors)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Outputs\u003c\/td\u003e\n\u003ctd\u003eRedundant Form-A and Form-C safety relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial\/Network Interfaces\u003c\/td\u003e\n\u003ctd\u003eModbus RTU (RS-485) and Modbus TCP (Ethernet) ports\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostic Interlocking\u003c\/td\u003e\n\u003ctd\u003eContinuous microcode health monitoring and real-time event logging\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Drive \u0026amp; Governor Feedback Logic\u003c\/h3\u003e\n\u003cp\u003eThe Woodward 9905-068 implements precise actuator loop feedback response parameters to maintain exact governor tracking across changing load gradients. The internal processing network utilizes specialized tracking matrices to achieve harmonic distortion suppression, preventing magnetic pickup sensor noise or electrical tooth ripples from causing signal jitter on the high-speed input lines. The module correlates raw turbine speed inputs directly with field-oriented vector control data paths, allowing the 2oo3 internal CPU matrix to execute shutdown commands within 12 ms whenever the preset velocity boundaries are breached.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the Energize-to-Trip (ETT) relay logic operate during a complete loss of the 24 VDC input power rails? A: In an ETT framework, the internal safety relays remain unpowered during normal operation and require positive electrical execution to initiate a shutdown. A complete loss of external power prevents the relays from energizing, thereby prioritizing process continuity over an automatic drop-out trip during power disruptions.\u003c\/p\u003e\n\u003cp\u003eQ: Can an individual speed input sensor be disconnected or serviced while the overspeed module is running live process control loops? A: Yes. Because the module utilizes a hardware-based 2-out-of-3 (2oo3) voting matrix across three independent CPUs, a technician can isolate and service a single magnetic pickup input without tripping the system or interrupting active machinery protection monitoring.\u003c\/p\u003e\n\u003cp\u003eQ: What are the specific terminal assignment criteria when routing mixed active and passive speed sensors to the MPU board inputs? A: Each of the three speed channels must be wired to its matching terminal block cluster. Passive magnetic pickups require no external biasing, whereas active or Hall-effect sensors must draw voltage from the regulated 24 VDC power terminals on the module backplane layout.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnclosure Mechanical Attachment:\u003c\/strong\u003e Mount the industrial housing onto a clean vertical panel surfaces inside the control cabinet. Secure all mounting bolts to satisfy standard industrial vibration-resistance profiles and prevent mechanical micro-fretting at the backplane interface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed Sensor Cable Shielding:\u003c\/strong\u003e Run all MPU or Hall-effect sensor wires using individual twisted, fully shielded pairs. Terminate the outer copper shield braid exclusively at the dedicated instrument earth ground bus bar inside the local panel enclosure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRedundant DC Feeder Segregation:\u003c\/strong\u003e Connect the dual 18-32 VDC power lines from two independent power supply modules. Route the primary and secondary feeder wires through separate wiring tracks to ensure that a localized cable fault cannot drop both input rails simultaneously.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModbus Communication Line Isolation:\u003c\/strong\u003e Route the RS-485 serial links and Modbus TCP Ethernet cables away from high-current AC motor leads or inductive braking components to minimize high-frequency noise coupling across data packets.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":42870826991706,"sku":"9905-068","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/185_c77afdaa-0a0a-4462-89e7-23f196e4ec0b.jpg?v=1772762222","url":"https:\/\/www.spareoil.com\/products\/9905-068-woodward-overspeed-protection-module-new-original-stock","provider":"SpareOil Automation","version":"1.0","type":"link"}