Introduction
The Bently Nevada 3500/22-01-01-02 is a specific hardware configuration of the 3500/22 Tachometer Module, a vital component within the GE Bently Nevada 3500 Machinery Protection System. This module is specifically designed for the continuous monitoring of rotational speed (RPM) and provides a Keyphasor® reference signal for phase-related measurements.
Its primary function is to process signals from speed sensors (such as magnetic pickups or prox probes) to determine the rotational speed of a shaft. Furthermore, it generates a once-per-revolution Keyphasor pulse, which is essential for measuring vibration phase angle—a critical parameter for rotor dynamics analysis, balancing, and determining the mode of vibration. The module can also provide overspeed and underspeed protection, making it a versatile tool for both monitoring and safeguarding critical rotating machinery.
Parameters / Specifications
The key technical specifications for the Bently Nevada 3500/22-01-01-02 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 3500/22-01-01-02 |
| Product Line | GE Bently Nevada 3500 System |
| Module Type | Tachometer / Speed Monitoring Module |
| Primary Function | Speed (RPM) measurement, Keyphasor generation, overspeed/underspeed protection. |
| Number of Channels | 2 independent channels (typically one for speed, one for Keyphasor). |
| Sensor Input | Accepts passive magnetic pickups (MPUs), eddy current probes, or photocells. |
| Speed Range | 0 to 9999 RPM (or equivalent frequency) |
| Keyphasor Output | Provides a once-per-revolution pulse for phase reference. |
| Setpoints | 4 programmable setpoints (e.g., Overspeed Trip, Overspeed Alarm, etc.). |
| Relay Outputs | Dedicated relay outputs for alarm and danger setpoints. |
| Power Supply | Derived from the 3500 Rack |
| Communication | Via the rack's backplane with the 3500/92 Communication Module |
| Dimensions (H x W) | Standard 3500 Series Module (Approx. 3.9" x 8.7" or 99 mm x 221 mm) |
| Weight (Approx.) | 1.1 lbs (0.5 kg) |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) |
Application Scenarios
The 3500/22 Tachometer Module is deployed in virtually all applications involving critical rotating machinery where knowledge of shaft speed and rotational position is required for protection and analysis.
Typical application scenarios include:
Speed Monitoring and Overspeed Protection:
Continuously monitoring the RPM of turbines, compressors, and large pumps. It provides reliable overspeed protection by initiating an alarm or shutdown if the speed exceeds predefined dangerous limits.
Vibration Phase Reference (Keyphasor):
Providing an essential timing signal for vibration analysis. The Keyphasor pulse is used to determine the phase angle of vibration, which is indispensable for field balancing of rotors and for diagnosing faults like unbalance, misalignment, and cracked shafts.
Startup and Shutdown (Coast-Down) Analysis:
Working in conjunction with the 3500/15 Transient Data Interface (TDI) module to capture speed and vibration phase data during machine start-ups and shutdowns. This data is crucial for analyzing rotor dynamics through Bode and Nyquist plots.
Zero-Speed Detection:
Used for sequencing auxiliary systems, such as ensuring that a turbine or compressor has completely stopped before initiating turning gear operation or allowing maintenance to begin.
Industries of Use:
Power Generation (Gas, Steam, and Hydro Turbines)
Oil & Gas (Pipeline Compressors, Pumps)
Petrochemical & Refining
Marine Propulsion
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