Introduction
The model 3500/25-02-01 is a Keyphasor® Module for the Bently Nevada 3500 Machinery Protection System. This module is a critical component for providing a timing reference for a machine's rotation. It conditions the signal from a Keyphasor transducer (typically a proximity probe) to generate a sharp, clean pulse once per shaft revolution. This pulse is used throughout the monitoring system as a phase reference for vibration vectors, for speed measurement, and to synchronize data acquisition for startup/shutdown (coast-down) analysis. The "-02-01" suffix defines specific hardware and software configurations, such as firmware version and connector types.
Parameters / Specifications
The following table outlines the key technical parameters for the 3500/25-02-01 module.
| Parameter | Specification |
|---|---|
| Model Number | 3500/25-02-01 |
| Description | Keyphasor® Module |
| Physical Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 120 mm (7.5 in x 1.6 in x 4.7 in) [Standard 3500 Series frame slot] |
| Weight | Approx. 0.45 kg (1.0 lb) |
| Input Channels | 2 independent Keyphasor input channels |
| Input Signal | Accepts signals from proximity probes, magnetic pickups, or photoelectric sensors. |
| Input Voltage Range | Typically -1 V to -20 V DC from an eddy current probe system. |
| Keyphasor Output | A digital pulse once per revolution for each channel, distributed to other modules in the 3500 rack. |
| Speed Measurement | Yes, derived from the Keyphasor pulse rate. |
| Power Supply | Powered by the 3500 rack; typically +24 VDC from the system power supply. |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) |
| Compatibility | Bently Nevada 3500 Series Rack. Requires a compatible power supply and transducer. |
*Note: The exact specifications, such as input impedance and signal thresholds, are defined by the "-02-01" configuration code. Always refer to the official product datasheet for critical applications.*
Application Scenarios
The 3500/25 Keyphasor Module is essential for any application requiring phase-related vibration data or precise speed tracking.
Rotor Dynamics Analysis:
Provides the phase reference necessary for determining the phase angle of vibration vectors, which is critical for field balancing of rotors and for identifying instability, such as oil whirl.
Startup and Shutdown (Coast-Down) Monitoring:
Enables the 3500 system to collect and plot vibration amplitude and phase data as a function of rotor speed during machine transients, which is crucial for diagnosing resonance and other speed-dependent phenomena.
Speed Measurement and Overspeed Protection:
Provides a reliable speed signal that can be used by the monitoring system for overspeed detection and protection, ensuring the machine does not operate beyond its safe maximum speed.
Multi-Train Machinery:
With two independent channels, a single module can provide Keyphasor references for two different shafts on a complex machine train (e.g., a turbine and a compressor), simplifying the system architecture.
Diagnostics and Order Tracking:
Allows vibration analysts to filter vibration data to synchronous (1X) or other harmonic (2X, 3X) components, which is a fundamental technique for diagnosing common faults like imbalance, misalignment, and shaft cracks.
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