​​Product Description​​

​​Description:​​

The​​Bently Nevada 129478-01​​is a 4-Channel Vibration Monitor module designed for the renowned 3500 Machinery Protection System.This module is a fundamental component for continuous monitoring of critical machinery parameters,including radial vibration,axial position,and speed,by processing signals from proximity probes and accelerometers.It provides essential protection by generating alarms and shutdown signals to prevent catastrophic damage to turbines,compressors,pumps,and other high-value rotating assets.

​​Application Scenarios​​

Application Scenarios:

In a natural gas compressor station,a high-pressure centrifugal compressor begins to develop a rotor instability due to a bearing wear issue.The​​Bently Nevada 129478-01​​monitor,connected to XY proximity probes on the compressor’s bearings,detects a steady increase in vibration amplitude.As the vibration levels cross the pre-set alarm threshold,the module triggers a warning alert in the control room,allowing operators to investigate.Before the vibration can reach a dangerous level that would cause physical damage to the compressor rotor and casing,the module’s secondary alarm threshold initiates a safe and orderly shutdown of the unit through the emergency shutdown system(ESD).The​​129478-01​​’s precise monitoring and reliable protection directly prevent a multi-million dollar equipment failure and a potential safety incident.

​​Parameter​​

Main Parameters

Value/Description

​​Product Model​​

​​Bently Nevada 129478-01​​

​​Manufacturer​​

Bently Nevada(A Baker Hughes Business)

​​Product Category​​

4-Channel Vibration Monitor(3500/42M)

​​Compatible System​​

3500 Machinery Protection System

​​Input Channels​​

4 independent channels

​​Input Type​​

Accepts signals from Eddy Current Proximity Probes,Seismics,etc.

​​Measured Parameters​​

Vibration(Peak-to-Peak,RMS),Position,Gap Voltage,Speed

​​Alarm Outputs​​

2 programmable alarms per channel(Danger,Alert)

​​Dynamic Range​​

0 to 4000µm pk-pk(typical for vibration)

​​Power Supply​​

+24 VDC from 3500 rack

​​Communication​​

Integral to 3500 rack communication network

​​Operating Temperature​​

-30°C to+65°C

​​Technical Principles and Innovative Values​​

Technical Principles and Innovative Values:

The​​Bently Nevada 129478-01​​is engineered for maximum reliability and precision in critical protection applications.

​​Innovation Point 1:Redundant Dual-Path Signal Processing.​​Each channel incorporates redundant signal paths for key parameters.The module continuously monitors the raw gap voltage from the proximity probe system alongside the processed vibration or position values.This allows it to detect probe,extension cable,or system faults independently of the machinery condition,providing an unparalleled level of diagnostic integrity and preventing false trips.

​​Innovation Point 2:Advanced Dynamic Signal Processing.​​The module uses sophisticated digital signal processing to derive multiple parameters from a single input.For example,from a proximity probe signal,it can simultaneously extract DC position(for thrust bearing monitoring)and AC vibration(for radial bearing condition).This multi-parameter capability from a single sensor reduces wiring complexity and provides a more comprehensive view of machine health.

​​Innovation Point 3:TMR(Triple Modular Redundant)Architecture Integration.​​While the​​129478-01​​itself is a single module,it is designed to be used in a TMR(Triple Modular Redundant)configuration within the 3500 framework.Three identical modules can be configured so that their outputs are voted on(2-out-of-3)before initiating a shutdown.This architecture drastically increases system availability by preventing a single module failure from causing a spurious trip,which is critical for large turbines and compressors.

​​Application Cases and Industry Value​​

Application Cases and Industry Value:

​​Project Case:Combined-Cycle Power Plant Turbine Protection.​​A 300 MW gas turbine in a combined-cycle power plant is equipped with a Bently Nevada 3500 system.The​​129478-01​​modules are used to monitor the turbine’s radial vibration at several bearings.During a rapid load change,one module detects a vibration spike that triggers a”Danger”alarm.However,due to the TMR configuration,the shutdown is only executed because a second​​129478-01​​module also confirms the high vibration.This prevents a single-point failure from causing a trip.Subsequent investigation reveals a temporary steam disturbance was the cause.The system’s reliability allowed the turbine to continue operating,avoiding an estimated$250,000 cost associated with an unnecessary trip and restart.This case highlights the​​129478-01​​’s role in both protecting assets and maximizing availability.

​​Related Product Combination Solutions​​

The​​Bently Nevada 129478-01​​is a core component within a larger monitoring and protection ecosystem:

​​Bently Nevada 3500/15 Power Supply:​​Provides regulated power to the entire 3500 rack,including the​​129478-01​​modules.

​​Bently Nevada 3500/22M TMR Relay Module:​​The module that performs the 2-out-of-3 voting on alarm signals from triplicated​​129478-01​​modules.

​​Bently Nevada 3500/92 Communication Gateway:​​Provides the interface to send data from the​​129478-01​​to a DCS or plant asset management system.

​​Bently Nevada 3300 XL 8mm Proximity Probes:​​The sensors(e.g.,​​330101-00-00-10-02-00​​)that provide the raw signal to the​​129478-01​​monitor.

​​Bently Nevada 3500/25 Keyphasor®Module:​​Provides a once-per-revolution timing signal that is essential for phase reference and speed measurement.

​​Installation,Maintenance,and Full-Cycle Support​​

Installation,Maintenance,and Full-Cycle Support:

Installation of the​​Bently Nevada 129478-01​​must be performed by trained personnel with the system powered down.The module is carefully inserted into a slot in the 3500 rack,ensuring proper alignment and connector engagement.Configuration is performed using Bently Nevada’s dedicated configuration software to set alarm thresholds,filter settings,and other parameters specific to the machinery being protected.A full functional test must be performed after installation.

Routine maintenance involves periodic verification of the monitor’s calibration and alarm setpoints against a known signal source.The module’s status LEDs and software diagnostics should be checked regularly.It is a best practice to have a spare​​129478-01​​module on hand for critical systems to facilitate a quick replacement during scheduled outages and minimize downtime.

We guarantee that every​​Bently Nevada 129478-01​​module we supply is a 100%genuine Bently Nevada component,ensuring full compatibility and performance within the 3500 system.Our technical support team can provide guidance on compatibility and sourcing.We understand the criticality of machinery protection systems and are committed to providing reliable components and support to safeguard your valuable assets.Contact us for a solution you can trust.

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