Introduction
The 3500/15-02-00-00 is a Keyphasor Module within the Bently Nevada 3500 Machinery Protection System. Its primary function is to condition the signal from a Keyphasor® transducer (typically a proximity probe) and provide a clean, reliable once-per-revolution pulse for the entire monitoring system. This timing reference is fundamental for measuring rotational speed, determining vibration phase lag, and identifying the slow-roll runout of a machine's shaft. It is a critical component for advanced machinery diagnostics, including balancing and startup/shutdown (coast-down) analysis.
Technical Parameters
The following table outlines the key technical specifications for the 3500/15-02-00-00 Keyphasor Module.
| Parameter Category | Specification |
|---|---|
| Part Number | 3500/15-02-00-00 |
| Description | Keyphasor Module for 3500 System |
| Physical Dimensions (H x W x D) | Approximately 128 mm x 40 mm x 200 mm (5.04 in x 1.57 in x 7.87 in) *Standard single-slot module for a 3500 rack.* |
| Weight | Approximately 0.5 kg (1.1 lbs) |
| Input Type | Accepts signals from eddy current proximity probes or magnetic pickups |
| Input Channels | Typically 2 independent channels |
| Keyphasor Signal Output | Provides a digital pulse to all monitoring modules in the rack via the backplane. |
| LED Indicators | Per channel: OK, Alert, Danger, and Keyphasor Signal |
| Power Supply | Powered by the 3500 rack via the backplane (from the 3500/53 Power Supply). |
| Compatibility | Designed for use within the Bently Nevada 3500 rack system. Interfaces with other 3500 modules like the Vibration Monitor (3500/42). |
| Operating Temperature | 0°C to 65°C (32°F to 149°F) |
*Note: The specifications provided are representative of this module family. The "-02-00" suffix may indicate specific firmware or hardware revisions. Always consult the official Bently Nevada 3500/15 documentation for precise configuration details.*
Application Scenarios
The 3500/15 Keyphasor Module is essential in any application where understanding the dynamic behavior and precise rotational position of a shaft is critical for protection and diagnosis.
Steam and Gas Turbines in Power Generation:
Provides the vital once-per-turn reference for measuring shaft speed during startup and shutdown. It is crucial for calculating the phase of vibration vectors, allowing engineers to identify imbalance and other synchronous vibration issues.
Centrifugal and Axial Compressors in Oil & Gas:
Used to monitor rotational speed and provide a phase reference for troubleshooting complex vibrations, such as subsynchronous whirl or shaft cracks, by correlating vibration data to a specific point on the shaft.
Large Pumps and Motors:
Enables in-situ balancing by providing the phase angle reference needed to determine the correct location for adding or removing balance weights. This is critical in water treatment, chemical processing, and other industries.
Hydroelectric Turbines and Generators:
Monitors the slow rotational speed of large hydro units and provides a phase reference for analyzing vibration modes and ensuring stable operation.
Paper Mill Machinery:
Used on large rolls and dryer sections to monitor speed and use phase data to identify misalignment and roll defects.
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