Introduction
The assembly 3500/42-09-00 140734-02 is a Turbine Supervisory Monitor (TSM) and its associated LVDT/RVDT Input Card for the Bently Nevada 3500 Machinery Protection System. The 3500/42 is a versatile, programmable monitor chassis designed to handle a variety of transducer inputs critical for monitoring large rotating equipment. Paired with the 140734-02 input card, this assembly is specifically configured to interface with LVDTs (Linear Variable Differential Transformers) or RVDTs (Rotary Variable Differential Transformers). This setup allows the 3500 system to monitor critical parameters such as valve position, differential expansion, and case expansion on steam turbines and other large machinery.
Parameters / Specifications
The following table outlines the key technical parameters for this monitoring assembly.
| Parameter | Specification |
|---|---|
| Assembly Designation | 3500/42-09-00 (Monitor) & 140734-02 (Input Card) |
| Description | Turbine Supervisory Monitor with LVDT/RVDT Input Card |
| Monitor: 3500/42-09-00 | |
| 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: 140734-02 | |
| Description | LVDT / RVDT Input Card |
| Compatible Inputs | LVDTs (Linear Variable Differential Transformers), RVDTs (Rotary Variable Differential Transformers) |
| Key Measurements | Differential Expansion, Case Expansion, Valve Position |
| Excitation Output | Provides AC excitation voltage to the LVDT/RVDT (e.g., 3 Vrms, 2.5 kHz) |
| Signal Input | Accepts AC voltage signal from the LVDT/RVDT secondary |
| Total Assembly Weight | Approx. 0.6 kg (1.32 lb) |
*Note: The specific configuration, including the number of active channels, input range, scaling, and alarm setpoints, is defined by the "-09-00" suffix and the system's software setup. The 140734-02 card provides the necessary excitation and signal conditioning for the connected LVDT/RVDT.*
Application Scenarios
This monitoring assembly is crucial for monitoring mechanical positioning and expansion on large turbines and other critical machinery.
Turbine Differential Expansion Monitoring:
The primary application is to monitor the differential expansion between the rotor and stator of a steam turbine during startup, shutdown, and operation. This is critical for preventing destructive internal rubs.
Case Expansion Monitoring:
Used to measure the absolute thermal growth of the turbine casing itself, providing important data for understanding the machine's thermal dynamics and alignment.
Valve Position Monitoring:
Accurately monitors the position of main steam stop valves, control valves, and governor valves on turbines, ensuring proper operational control and performance.
API 670 Compliant Machinery Protection:
Serves as the monitoring and alarm unit for differential expansion and valve position channels in a machinery protection system designed to meet API 670 standards.
Other Linear Position Applications:
Can be used on other large machinery where precise measurement of linear position is required, such as on large pumps or compressors, using LVDT-based position transducers
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