Introduction
The component with part number 3500/40M-01-00 176449-01 is a vital monitoring module within the Bently Nevada* 3500 Machinery Protection System. This part number refers to the 3500/40M Monitoring Module, which is a versatile, dual-channel module designed to monitor a wide range of machinery parameters.
The primary function of the 3500/40M is to accept signals from various transducers to monitor vibration (both seismic and relative shaft vibration), position, speed, and other dynamic signals. It provides continuous surveillance, keyphasor® reference, and programmable alarm and danger setpoints to protect critical assets from damage.
*Bently Nevada is a part of Baker Hughes.
Parameters
The following table outlines the key technical parameters for the 3500/40M-01-00 176449-01 Monitoring Module.
| Parameter | Specification |
|---|---|
| Part Number | 3500/40M-01-00 176449-01 |
| Module Type | Dual-Channel Monitoring Module |
| Compatibility | Bently Nevada 3500 Series Racks |
| Number of Channels | 2 |
| Input Types | Accepts signals from proximity probes, velocity seismometers, and accelerometers (often with an external signal conditioner). |
| Programmable Functions | Can be configured for: Radial Vibration, Thrust Position, RPM, Acceleration, Velocity, and more. |
| Keyphasor Input | Includes one dedicated Keyphasor input per module for timing and phase reference. |
| Primary Function | Monitors dynamic machinery parameters, provides programmable alarms (Alert and Danger), and can initiate a machinery shutdown. |
| Power Requirement | Powered directly from the 3500 rack backplane. |
| Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 200 mm (7.5 in x 1.6 in x 7.9 in) *Standard 3500 Series full-size module slot.* |
| Weight | Approx. 0.45 kg (1.0 lb) |
Application Scenarios
The 3500/40M is one of the most common and flexible modules in the 3500 system, used for a broad range of machinery protection applications. Key scenarios include:
Shaft Vibration Monitoring:
Using non-contact proximity probes to monitor the relative vibration of a rotor relative to its bearings in real-time. This is critical for detecting unbalance, misalignment, and oil whirl.
Thrust Position Monitoring:
Monitoring the axial position of a rotor to prevent catastrophic damage from rotor-to-stationary part contact in machines like turbines and compressors.
Casing Vibration Monitoring:
Using velocity seismometers or accelerometers to monitor absolute (seismic) vibration of machine casings, bearings, or structures.
Speed and Phase Reference:
Using the integrated Keyphasor channel to provide a once-per-revolution timing signal for measuring rotor speed and phase angle, which is essential for machine balancing and startup/shutdown analysis.
Overall Machinery Protection:
Serving as the primary protection device by continuously comparing monitored signals against safe operating limits (Alert and Danger setpoints). If a dangerous condition is detected, it can trigger an alarm or a shutdown signal to the turbine control system to prevent machine failure.
Typical Machinery Protected:
Steam and Gas Turbines
Centrifugal and Axial Compressors
Large Pumps, Fans, and Motors
Generators
Gearboxes
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