Bently 289761-01

Product Overview

The 3500/42M is a critical module within the Bently Nevada 3500 Rack System. The 3500 system is a highly modular and configurable machinery protection system, primarily used for the continuous monitoring of large rotating equipment (such as steam turbines, gas turbines, compressors, pumps, fans, etc.) to ensure their safe and reliable operation.

The core function of the 289761-01 module is to: Process signals from eddy current proximity probes to continuously monitor shaft radial vibration and trigger alarms or shutdown signals when vibration levels exceed preset alarm values, thereby protecting the machine from damage.

Key Features & Functions

1. Dual-Channel Design: A single module can simultaneously monitor two independent radial vibration points (e.g., X and Y directions).

2. Signal Processing:

   • Accepts raw signals from two eddy current probe systems.

   • Calculates the peak-to-peak vibration amplitude.

   • Provides GAP voltage signals for monitoring the gap between the probe and the shaft surface, which is useful for diagnosing mechanical issues (such as shaft displacement, alignment problems).

3. Configurable Alarm Setpoints: Users can set multiple alarm thresholds for each channel, typically including:

   • Alert Alarm: Notifies operators that vibration levels have increased and require attention.

   • Danger Alarm: Vibration has reached a level that could damage the machine; the system will trigger a shutdown signal.

   • Alert Bypass: Allows alarms to be suppressed during machine startup/shutdown (when vibration is inherently high).

4. Dynamic Signal Outputs: Provides analog outputs (4-20 mA or ±10 VDC) proportional to the vibration value, which can be connected to a DCS, PLC, or other recording devices.

5. Buffered Sensor Outputs: Provides buffered outputs of the raw sensor signals, which can be connected to an oscilloscope or dynamic data collector for advanced diagnostic analysis.

6. TDI (Keyphasor®) Input: Requires a Keyphasor signal to provide a phase reference, which is crucial for determining vibration direction and imbalance location.

7. LED Status Indicators: The module’s front panel has LED indicators that display the real-time status (OK, Alert, Danger) for each channel, as well as the module’s health.

8. 3500 Framework Compatibility: Must be installed in a Bently Nevada 3500 series rack, which provides power via the backplane and communication.

Technical Parameters (Summary)

• Input Signal: From eddy current probes with -11mV/µm or -8mV/mil sensitivity.

• Measurement Range: Typically 0-400 µm pk-pk or 0-16 mils pk-pk (depending on configuration).

• Frequency Response: Typically 10 Hz to 2 kHz.

• Alarm Delay: Adjustable to prevent false alarms.

• Power Supply: Provided by the 3500 rack, typically +15V DC and -15V DC.

Applications

This monitor is widely used in industries with high demands for safety and reliability:

• Oil & Gas (Compressors, Pumps)

• Power Generation (Steam Turbines, Gas Turbines, Generators)

• Chemical & Refining

• Pulp & Paper

• Metals & Mining

Importance

The 3500/42M (289761-01) is the first line of defense against catastrophic failures in rotating machinery. By monitoring vibration in real-time, it helps to:

• Prevent Equipment Damage: Initiate shutdown before failure occurs.

• Reduce Downtime: Enable planned maintenance through early warnings.

• Enhance Operational Safety: Protect personnel and assets.

☀️Tara(Sales Director)

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?Product Condition: One-year warranty

Sales of the brand:

ABB、EPRO、GE、FOXBORO、Schneider、Rexroth、Honeywell、Bently、YASKAWA other global DCS system and PLC system, servo system of famous industrial brand.

Company Overview

Main Products

We specialize in supplying original imported spare parts for DCS, PLC, robotics, and large servo systems from leading global brands, including:

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