Bently Nevada 87890-01 3300 System Monitor The Bently Nevada 87890-01, also cataloged as the 87890-01 System Monitor, operates as a...
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Bently Nevada 87890-01 3300 System Monitor
The Bently Nevada 87890-01, also cataloged as the 87890-01 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.
Hardware Specifications
Parameter
Specification
Model
87890-01
Brand
Bently Nevada
Product Type
System Monitor
Series
3300
Origin
United States
Weight
2.8 kg
Operating Temp
-20 deg C to +65 deg C
Power Consumption
<15 W
Power Supply
18-36 VDC / 85-264 VAC
Voltage Monitoring
+VRH, +VRL, +7.5 V, +5 V, REF, -7.5 V
Power-up Inhibit Duration
Approx. 2 seconds
System Reset Function
External contact closure or front panel RESET switch
Trip Multiply Function
2X or 3X alarm setpoint increase option
OK Relay Type
SPDT relay located on Power Input Module
Availability
In Stock
Bently Nevada Rotor Monitoring and System Supervision Features
The 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.
The 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).
In 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.
For 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.
Frequently Asked Questions
Q: What power inputs does the Bently Nevada 87890-01 System Monitor support? A: The module supports 18-36 VDC and 85-264 VAC power input ranges for 3300 system rack operation.
Q: How does the Power-up Inhibit function operate on the 87890-01? A: 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.
Q: What does the OK Relay indicate on this System Monitor? A: 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.
Field Installation Guidelines
Install the 87890-01 System Monitor in the designated slot of a compatible Bently Nevada 3300 rack configuration.
Connect 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.
Use 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.
Check the front panel LED indicators after installation. Confirm that all monitored voltage indicators display normal operation before enabling machinery protection functions.
Ensure 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.
