Introduction to 3500/25 128718-01
The 3500/25 128718-01 is a critical monitoring module from the Bently Nevada 3500 Series, a globally recognized system for machinery protection. This specific model is a Keyphasor® Module.
Its primary function is to provide a once-per-revolution timing reference for a machine shaft. It processes the signal from a Keyphasor transducer (typically an eddy current proximity probe) to generate a sharp electrical pulse each time a keyway or notch on the shaft passes the probe. This Keyphasor pulse is fundamental for measuring rotational speed, determining vibration phase angle, and acting as a trigger for synchronous data acquisition across other monitoring modules in the 3500 rack (like vibration and position monitors). The "128718-01" is a specific hardware or firmware revision.
Technical Parameters
The following table details the key specifications for the 3500/25 Keyphasor Module.
| Parameter | Specification |
|---|---|
| Product Family / Series | Bently Nevada 3500 |
| Module Type | Rack-Monitoring Module |
| Function | Dual Channel Keyphasor Module |
| Compatible Sensors | Eddy Current Proximity Probes (Primary), Magnetic Pickups (MPU) |
| Key Measurements | Shaft Speed (RPM), Provides a once-per-revolution timing pulse |
| Input Power | Powered by the 3500 Rack |
| Alarm Channels | OK-to-Relay (ensures signal validity) |
| Communication | Integrates with the 3500 framework; its timing pulse is used by other modules in the rack. |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) (Typical for control room environments) |
| Mounting | Installs in a 3500 Series rack |
| Approx. Dimensions (H x W) | 3 U (133.4 mm) x 1/4 Rack Width (Typical for a single-width 3500 module) * |
| Approx. Weight | ~ 1.0 kg (2.2 lbs) |
Note: The exact dimensions are defined by the rack slot it occupies.
Application Scenarios
The Keyphasor module is an enabling component for nearly all advanced machinery monitoring functions. It is essential wherever phase and speed information are critical for machine analysis and protection.
Rotor Dynamics Analysis: Used with turbines and compressors in power generation and oil & gas to provide phase data for balancing runs, allowing engineers to determine the exact angular position of imbalance on a rotor.
Startup and Coastdown Monitoring (Bode/Nyquist Plots): Capturing vibration amplitude and phase data as a machine passes through its resonant speeds during startup or shutdown, which is critical for understanding rotor dynamics.
Synchronization and Fault Identification: Differentiating between 1X, 2X, and other vibration frequencies to diagnose specific mechanical faults like imbalance, misalignment, and shaft cracks in critical equipment across industries like petrochemicals and heavy industry.
Speed Reference for Control Systems: Providing a reliable and critical speed signal for the machinery control system to ensure safe operational limits.
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