Product Introduction: 3500/32 149986-02 + 125720-02
The 3500/32 149986-02 + 125720-02 is a Keyphasor® Module assembly for the Bently Nevada 3500 Machinery Protection System. This configuration consists of two distinct parts: the main module (149986-02) and its associated terminal board (125720-02). The Keyphasor® Module is a fundamental component for condition monitoring, providing a once-per-turn timing pulse from a rotating shaft. This pulse is used as a phase reference to measure vibration phase lag, determine rotor speed, and synchronize data acquisition. The "-02" suffix typically indicates a specific hardware revision or assembly variant. The terminal board facilitates the external wiring of the Keyphasor® probe (a proximity transducer) to the system.
Key Parameters & Specifications
The following table summarizes the critical parameters of the complete 3500/32 assembly.
| Parameter Category | Specification Details |
|---|---|
| Assembly Part Number | 3500/32 (comprised of 149986-02 & 125720-02) |
| Main Module | 149986-02 (3500/32 Keyphasor Module) |
| Terminal Board | 125720-02 (3500/TB 32 Keyphasor Terminal Board) |
| Primary Function | Conditions the signal from a Keyphasor proximity probe to provide a clean, once-per-rev timing pulse for phase and speed reference. |
| Channels | One independent Keyphasor input channel. Can accept signals from one or two probes (for redundancy or multi-trigger applications). |
| Compatible Probe | Standard Bently Nevada proximity transducer (e.g., 3300 or 3300 XL 8mm or 11mm probes) with -24 VDC power from the module. |
| Input Signal | Raw sine wave from the proximity probe observing a keyphasor mark (notch, key, or dimple) on the shaft. |
| Output Signals | • Digital Keyphasor Pulse: For the 3500 monitor modules and external devices. • Buffered Raw Signal: For oscilloscope or external analysis. |
| Speed Measurement | Yes, derived from the Keyphasor pulse. |
| LED Indicators | OK, Active Probe, Power. |
| Power Requirement | Powered from the 3500 rack backplane; provides -24 VDC to the connected probe(s). |
| Dimensions (Main Module) | Standard 3500 series module: 133 mm (5.25 in) x 55 mm (2.17 in) x 170 mm (6.70 in). |
| Dimensions (Terminal Board) | Designed for mounting on the 3500 rack's internal vertical mounting rails. |
| Weight (Main Module) | Approximately 0.45 kg (1.0 lb). |
| Weight (Terminal Board) | Approximately 0.2 kg (0.44 lb). |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F). |
| Key Features | • Adjustable sensitivity and trigger level for reliable pulse generation. • Dual Probe Capability: Can accept input from a second probe for redundancy. • Fault detection for probe or cable issues. • Essential for synchronous, phase-based vibration analysis. |
Primary Application Scenarios
The 3500/32 Keyphasor Module is indispensable in any machinery protection system where vibration phase and speed data are critical for diagnostics and protection. Its applications include:
Vibration Phase Measurement: Provides the phase reference needed by vibration monitors (like the 3500/42M, 3500/25) to determine the angular location of unbalance or other defects on the rotor, which is crucial for field balancing.
Startup and Coast-down (Bode/Nyquist Plots): Enables the creation of Bode (amplitude/phase vs. speed) and Nyquist plots during transient conditions, which are essential for identifying critical speeds, resonance, and rotor stability issues.
Synchronous Data Acquisition: The Keyphasor pulse triggers synchronized waveform capture across multiple vibration channels (e.g., via TDI modules), allowing for precise order tracking and analysis of shaft orbits during transients or steady-state operation.
Speed Reference for Protection: Provides a highly reliable and independent speed signal to the system, used by overspeed protection modules (like the 3500/50) and for general speed monitoring.
Diagnostics of Rotor-Related Faults: The phase information is critical for diagnosing:
Rotor Unbalance (identifying heavy spot location)
Shaft Misalignment and Bent Shaft
Rotor Rubs
Cracked Shafts (by monitoring changes in phase with speed)
High-Criticality Machinery: Used across all industries with critical rotating assets, including:
Power Generation: Steam & Gas Turbines, Generators.
Oil & Gas: Centrifugal & Axial Compressors, Gas Turbines, Pumps.
Industrial: Large Motors, Fans, Gearboxes.
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