Bently Nevada 3500/50M 288062-02 Tachometer Module

The Bently Nevada 3500/50M (Part Number 286566-02) is a specialized 2-channel tachometer module engineered for the 3500 Machinery Monitoring System. This module provides critical speed monitoring, rotor acceleration tracking, and reverse rotation detection for rotating machinery, serving as a vital component in predictive maintenance and machine protection strategies.

Features

• Dual-channel input monitoring for proximity probes or magnetic pickups.
• Programmable alarm setpoints for speed, acceleration, and rotation direction.
• Integrated Keyphasor signal conditioning, allowing the module to provide signals to the 3500 rack backplane without requiring a dedicated Keyphasor module.
• Peak hold functionality to record maximum speed, peak reverse speed, or reverse rotation counts.
• Front-panel BNC connectors for buffered transducer outputs, facilitating direct connection to portable diagnostic tools.
• Status LEDs for real-time monitoring of module health (OK), communication (TX/RX), and bypass status.

Applications

• Oil and Gas: Monitoring of compressors, pumps, and turbines in upstream and midstream facilities.
• Power Generation: Protection for thermal, combined cycle, and hydroelectric turbine-generator sets.
• Industrial Processing: Safeguarding critical assets in refineries, LNG liquefaction plants, and high-speed transmission stations.

Technical Specifications

Installation Guidelines

• Ensure the 3500 rack is powered down before inserting or removing the module to prevent electrical damage.
• The 288062-02 External Termination Block (ETB) must be installed at the rear of the rack to facilitate transducer wiring.
• Use shielded cabling for all transducer inputs to minimize noise interference in industrial environments.
• Verify that the 3500/22M module firmware is at version 1.70 or later and the 3500/01 configuration software is version 4.20 or later for full compatibility.
• Follow standard ESD precautions when handling the module to protect internal circuitry.

FAQ

What sensors are compatible with the 3500/50M?

The module is designed to accept inputs from up to two proximity transducers or magnetic pickups.

Can this module be used for primary overspeed protection?

No. The 3500/50M is not intended for use as an independent overspeed protection system and does not provide the required safety-rated redundancy for such critical control functions.

How are configuration options managed?

Operational modes, including speed monitoring, zero-speed notification, and acceleration alarming, are configured via the 3500 Rack Configuration software.