{"product_id":"bently-nevada-87890-01-3300-system-monitor","title":"Bently Nevada 87890-01 3300 System Monitor","description":"\u003ch2\u003eBently Nevada 87890-01 3300 System Monitor\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 87890-01\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e87890-01\u003c\/strong\u003e System Monitor, operates as a dedicated hardware component for power supervision, alarm control, and system status management within the Bently Nevada 3300 machinery vibration monitoring system.\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\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\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\u003e87890-01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eSystem Monitor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003e3300\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\u003e2.8 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to +65 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;15 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e18-36 VDC \/ 85-264 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Monitoring\u003c\/td\u003e\n\u003ctd\u003e+VRH, +VRL, +7.5 V, +5 V, REF, -7.5 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower-up Inhibit Duration\u003c\/td\u003e\n\u003ctd\u003eApprox. 2 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Reset Function\u003c\/td\u003e\n\u003ctd\u003eExternal contact closure or front panel RESET switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrip Multiply Function\u003c\/td\u003e\n\u003ctd\u003e2X or 3X alarm setpoint increase option\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOK Relay Type\u003c\/td\u003e\n\u003ctd\u003eSPDT relay located on Power Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailability\u003c\/td\u003e\n\u003ctd\u003eIn Stock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBently Nevada Rotor Monitoring and System Supervision Features\u003c\/h3\u003e\n\u003cp\u003eThe 87890-01 System Monitor supervises the electrical status of the 3300 rack power supplies and connected monitor conditions. It monitors internal supply voltages including +VRH, +VRL, +7.5 V, +5 V, REF, and -7.5 V. Therefore, the front panel LED indicators provide direct visual confirmation of supply operation.\u003c\/p\u003e\n\u003cp\u003eThe module includes power-up inhibit logic to suppress false alarms during system energization or low supply voltage conditions. When activated, the function bypasses monitor alarms, forces output signals to zero scale, and de-energizes the System OK relay through the rack Power Input Module (PIM).\u003c\/p\u003e\n\u003cp\u003eIn addition, the System Monitor supports Trip Multiply operation for specific machine conditions. This function increases vibration alarm thresholds by a fixed factor of 2X or 3X during startup, coast down, structural resonance, or load transition conditions. The feature applies only to compatible monitors configured with this option.\u003c\/p\u003e\n\u003cp\u003eFor machinery protection applications, the module works with Bently Nevada vibration monitoring circuits that depend on accurate eddy-current probe scaling, gap voltage validation, and rotor dynamics analysis. The System Monitor maintains rack-level supervision so connected vibration channels can identify transducer faults and abnormal signal conditions.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What power inputs does the Bently Nevada 87890-01 System Monitor support?\u003cbr\u003eA: The module supports 18-36 VDC and 85-264 VAC power input ranges for 3300 system rack operation.\u003c\/p\u003e\n\u003cp\u003eQ: How does the Power-up Inhibit function operate on the 87890-01?\u003cbr\u003eA: The function suppresses alarm activity for approximately 2 seconds after power-up or during low supply voltage conditions. It prevents temporary startup conditions from generating vibration alarms.\u003c\/p\u003e\n\u003cp\u003eQ: What does the OK Relay indicate on this System Monitor?\u003cbr\u003eA: The OK Relay monitors the health status of connected transducer systems and monitor channels. It changes state when a fault, inhibit condition, or power loss affects the monitored circuit.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 87890-01 System Monitor in the designated slot of a compatible Bently Nevada 3300 rack configuration.\u003c\/p\u003e\n\u003cp\u003eConnect power wiring through the Power Input Module (PIM) according to the rack wiring documentation. Maintain proper separation between power conductors and low-level vibration signal wiring to reduce electrical interference.\u003c\/p\u003e\n\u003cp\u003eUse shielded instrumentation wiring for transducer-related connections and terminate cable shields according to the site grounding practice. Verify supply voltage levels before commissioning the rack.\u003c\/p\u003e\n\u003cp\u003eCheck the front panel LED indicators after installation. Confirm that all monitored voltage indicators display normal operation before enabling machinery protection functions.\u003c\/p\u003e\n\u003cp\u003eEnsure external contact inputs for System Reset and Trip Multiply functions use appropriate field wiring methods and avoid routing these signals near high-current switching circuits.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":44402563743832,"sku":"87890-01","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/87890-01-3.jpg?v=1784527545","url":"https:\/\/www.industriaxplc.com\/products\/bently-nevada-87890-01-3300-system-monitor","provider":"IndustriaX Limited","version":"1.0","type":"link"}