Introduction
The assembly 3500/40M-01-00 176449-01 is a Turbine Supervisory Monitor (TSM) Module and its associated Proximity Probe Input Card for the Bently Nevada 3500 Machinery Protection System. The 3500/40M is a versatile, modular monitor chassis designed to handle a variety of transducer inputs critical for monitoring large rotating equipment. Paired with the 176449-01 input card, this assembly is specifically configured to interface with eddy current proximity probes. This setup allows the 3500 system to monitor key parameters such as radial shaft vibration, axial position, and Keyphasor signals, providing vital protection for turbines, compressors, and other high-speed machinery.
Parameters / Specifications
The following table outlines the key technical parameters for this monitoring assembly.
| Parameter | Specification |
|---|---|
| Assembly Designation | 3500/40M-01-00 (Monitor) & 176449-01 (Input Card) |
| Description | Turbine Supervisory Monitor with Proximity Probe Input Card |
| Monitor: 3500/40M-01-00 | |
| Physical Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 120 mm (Standard 3500 Series frame slot) |
| Weight (Monitor) | Approx. 0.5 kg (1.1 lb) |
| Primary Function | Programmable Monitor for Turbine Supervisory Parameters |
| Input Channels | Configurable (typically 4 or 6 channels) based on installed input cards |
| Power Supply | Powered by the 3500 rack |
| Operating Temperature | 0°C to +65°C (32°F to 149°F) |
| Input Card: 176449-01 | |
| Description | Proximity Probe Input Card |
| Compatible Inputs | Eddy Current Proximity Probes (5 mm, 8 mm, 11 mm) |
| Key Measurements | Radial Vibration, Axial Position, Keyphasor®, Speed |
| System Sensitivity | -8.00 V/mm (±5%) / -200 mV/mil (±5%) (with matched probe system) |
| Frequency Response | 0 to 10,000 Hz (0 to 600,000 CPM) |
| Dynamic Range | Up to 2 mm (80 mils) |
| Total Assembly Weight | Approx. 0.6 kg (1.32 lb) |
*Note: The specific configuration, including the number of active channels and their function (vibration, position, etc.), is defined by the "-01-00" suffix and the system's software setup. The 176449-01 card provides the necessary signal conditioning and power for the connected proximity probes.*
Application Scenarios
This monitoring assembly is crucial for comprehensive machinery protection on high-value rotating assets.
Radial Vibration Monitoring on Turbines and Compressors:
The primary application is monitoring radial shaft vibration using proximity probes on critical equipment like steam turbines, gas turbines, and centrifugal compressors. This is essential for detecting imbalance, misalignment, and shaft instability.
Axial Thrust Position Monitoring:
Used to measure the axial (thrust) position of a rotor to monitor thrust bearing wear and prevent catastrophic failure due to excessive rotor movement.
Keyphasor® and Speed Measurement:
Provides conditioning for a proximity probe used as a Keyphasor® reference, generating a once-per-revolution pulse essential for phase analysis and accurate speed measurement.
API 670 Compliant Machinery Protection:
Serves as the core monitoring unit for shaft vibration and position channels in a machinery protection system designed to meet API 670 standards, ensuring reliable and standardized protection for critical assets.
Multi-Parameter Monitoring on Single Machine:
A single assembly can be configured to monitor multiple parameters from a single machine (e.g., radial vibration at two bearings, axial position, and Keyphasor), providing comprehensive protection and optimizing rack space.
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