{"product_id":"bently-nevada-3500-50m-286566-02-tachometer-module","title":"Bently Nevada 3500\/50M 286566-02 Tachometer Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e3500\/50M 286566-02 \u003c\/strong\u003eis a high-performance, dual-channel tachometer module designed for the Bently Nevada 3500 Machinery Protection System.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e Deployed globally across heavy industries including thermal power plants, oil refineries, and large-scale mining operations, this module processes inputs from passive magnetic pickups or proximity probes to provide precision shaft speed, rotor acceleration, and reverse rotation indicators. By continuously cross-referencing live data with programmable alarm setpoints, it executes instantaneous alarm generation to prevent catastrophic overspeed events. The module drastically reduces plant downtime by providing stable, conditioned Keyphasor signals straight to the rack backplane, eliminating the need for dedicated Keyphasor hardware in the same rack enclosure.\u003c\/p\u003e\n\u003ch3\u003eTechnical Configuration\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e286566-02 \u003c\/strong\u003efunctions as a primary processing card within the 3500\/50M tachometer architecture, delivering dual-channel sensor processing and independent configuration options via the 3500 Rack Configuration software.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSpeed Tracking Modes:\u003c\/strong\u003eSupports standard speed monitoring, multi-band speed alarming, zero-speed alerts, rotor acceleration tracking, and reverse rotation notification.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Data Logging:\u003c\/strong\u003eFeatures an on-board peak hold capability that permanently logs maximum forward speed, maximum reverse speed, and cumulative reverse rotation events until a manual or remote reset command is given.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSignal Interconnectivity:\u003c\/strong\u003e Routes internal conditioned Keyphasor pulses across the rack backplane, enabling simultaneous multi-channel phase tracking for adjacent vibration monitors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHardware Interface:\u003c\/strong\u003e Features front-panel buffered transducer outputs via coaxial connections alongside dedicated LEDs indicating module OK status, active serial communication TX\/RX, and system bypass state.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3500\/50M 286566-02\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannel Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 Independent Channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Signal Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+10.0 VDC to -24.0 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 kOhm (Standard) \/ 40 kOhm (TMR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransducer Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProximity Probes, Passive Magnetic Pickups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Input Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRPM Measurement Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 to 99999 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRPM Accuracy (\u0026lt; 100 rpm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±0.1 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRPM Accuracy (100 to 10000 rpm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±1 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRPM Accuracy (\u0026gt; 10000 rpm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±0.01% of true shaft speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAnalog Recorder Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 to 20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.8 watts typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.82 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e244.3 mm x 24.4 mm x 241.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eOperational FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 3500\/50M 286566-02 module be hot-swapped while the 3500 system is powered?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 3500\/50M tachometer card is designed for live insertion and removal within a powered 3500 rack. However, to prevent unintended trip signals on downstream machinery control components, the operator must place the associated protection loops or relay outputs into bypass before pulling the module.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the module determine the threshold for passive magnetic pickups versus proximity probes?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module configuration software allows operators to toggle between Auto Threshold and Manual Threshold modes. Auto Threshold works for any speed input above 1 rpm (0.0167 Hz) with a minimum peak-to-peak amplitude of 1 volt. Manual Threshold allows direct adjustment from +9.5 VDC down to -23.5 VDC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat indicates a catastrophic internal circuit failure versus a sensor line fault?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe front-panel OK LED will turn off completely or flash erratically if internal hardware diagnostics fail. If the fault resides in the field wiring or probe tip gap, the OK LED will illuminate red, indicating a Not OK field transducer status, while the internal data registers switch to an invalid data flag state.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Commissioning and Safety Directives\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSignal Cable Shielding:\u003c\/strong\u003e Terminate all external proximity sensor or magnetic pickup shields at the 3500 system's I\/O module ground bus terminal bar. Never ground the shield at both ends to ensure ground loops do not corrupt high-frequency pulse inputs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBuffered Output Isolation:\u003c\/strong\u003e The front-panel coaxial buffered outputs are short-circuit protected. Technicians can hook up portable vibration data collectors or external frequency analyzers directly to the front face without interrupting the machinery protection loop.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTarget Wheel Design Parameters:\u003c\/strong\u003e Ensure the speed sensing target wheel or keyway conforms to the 3500\/50M technical manual specifications. The configuration must be set precisely between 1 and 255 events per revolution to guarantee accurate acceleration computations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRecorder Output Calibration:\u003c\/strong\u003e When using the 4 to 20 mA recorder outputs for DCS speed replication, verify that the load resistance does not exceed 600 Ohms to prevent signal clipping and maintain calibration linearity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666517061995,"sku":"3500\/50M 286566-02","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-3500-50m-286566-02-tachometer-module-upbl1e2kq5e_ee299714-908e-4209-8aca-8be34c14b831.jpg?v=1765440101","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-3500-50m-286566-02-tachometer-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}