Component Description
The part number 3500/22 288055-01+146031-01 refers to a specific configuration of modules for the Bently Nevada 3500 Monitoring System.
3500/22: This designates a Dual-Channel Velocity Monitor Module. This module is specifically engineered to process signals from velocity transducers (seismometers) that measure the casing or bearing housing vibration of machines. It conditions the input signal, computes the overall vibration level in velocity units (e.g., mm/s or in/s RMS), and compares this value to user-configurable alarm setpoints.
288055-01: This is a specific hardware revision or assembly number for the Velocity Monitor Module.
146031-01: This is a Relay Module. This module provides physical relay outputs that are actuated based on alarm statuses received from the monitoring modules within the 3500 rack, such as the Velocity Monitor.
In summary, this part number represents a Dual-Channel Velocity Monitor Module paired with a Relay Module. This combination provides continuous monitoring of casing vibration and the ability to execute immediate protective actions (like initiating a machine shutdown) through relay outputs if vibration levels become dangerous.
Key Parameters
The following table outlines the key parameters for this module configuration.
| Parameter | Specification |
|---|---|
| System | Bently Nevada 3500 |
| Primary Function | Casing Vibration Monitoring & Protective Relay Output |
| Channels | Two independent velocity monitoring channels. |
| Input Type | Accepts signals from industrial velocity transducers (seismometers). |
| Frequency Response | Typically 4.5 Hz to 1000 Hz (270 to 60,000 CPM). |
| Measurement | Overall vibration velocity (mm/s RMS, in/s RMS). |
| Alarm Functions | Two programmable alarm setpoints (Alert, Danger) per channel. |
| Relay Outputs | Typically 4 or 6 independent, configurable Form-C relays. |
| Relay Contacts | SPDT (Single Pole Double Throw), often rated for 2A @ 30VDC or 250VAC. |
| Dynamic Signal Output | Buffered raw sensor signal for external analysis. |
| Mounting | Slides into dedicated slots in a 3500 rack. |
| Dimensions (H x W x D) | Approx. 193 mm x 55 mm x 200 mm (7.6 in x 2.16 in x 7.87 in) per module |
| Weight | Approx. 0.5 - 0.7 kg (1.1 - 1.5 lbs) per module |
Application Scenarios
This module configuration is applied in scenarios where monitoring the absolute vibration of the machine's structure is essential for detecting mechanical faults and ensuring safe operation.
Motor and Fan Monitoring:
Application: Large electric motors, induced/forced draft fans, blowers.
Function: Provides essential protection against unbalance, misalignment, and mechanical looseness by monitoring bearing housing vibration. The relay module will activate to trip the machine if vibration levels exceed safe limits.
Pump Casing Vibration:
Application: Vertical pumps, cooling water pumps, and other pumps with rolling element bearings.
Function: Detects faults like cavitation, bearing wear, and impeller issues. The relay outputs can be used to trigger an alarm in the control room or initiate an automatic shutdown to prevent catastrophic failure.
Auxiliary and General Purpose Equipment:
Application: Gearboxes, compressors, mixers, and conveyors.
Function: Serves as a cost-effective and reliable protection solution for a wide array of rotating equipment where basic, robust vibration monitoring is required for safety and to prevent unexpected failures.
Supplemental Monitoring on Critical Trains:
Application: Power generation and petrochemical plant machinery trains.
Function: Used alongside shaft vibration monitors (e.g., 3500/42M) on turbines and compressors to provide a more comprehensive view of machine health. Casing vibration can sometimes detect certain faults, like structural resonance or base looseness, that are not as visible in shaft vibration measurements.
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