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
Model
3500/50M
Order Code
286566-02
Associated ETB
288062-02
Input Signal Range
+10.0 V to -24.0 V
Standard Input Impedance
20 k Ohm
Recorder Output
+4 to +20 mA
Voltage Compliance
0 to +12 Vdc
Frequency Range
0.0167 Hz to 20 kHz
Rack Position
One full-height rear slot
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.
