Introduction
The assembly 3500/42M-01-00 176449-02 is a Turbine Supervisory Instrumentation (TSI) Module and its associated Velocity Sensor Input Card for the Bently Nevada 3500 Machinery Protection System. The 3500/42M is a versatile, modular monitor designed to accept a variety of transducer inputs, and in this specific configuration with the 176449-02 input card, it is specialized for processing signals from seismic velocity transducers. This setup allows the 3500 system to monitor casing or absolute vibration (velocity) on critical machinery, providing vital protection against mechanical failure by converting the transducer's signal into standard 4-20 mA outputs and alarm relays.
Parameters / Specifications
The following table outlines the key technical parameters for this monitoring assembly.
| Parameter | Specification |
|---|---|
| Assembly Designation | 3500/42M-01-00 (Monitor) & 176449-02 (Velocity Input Card) |
| Description | Turbine Supervisory Monitor with Velocity Input Card |
| Monitor: 3500/42M-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 various transducer types |
| Input Channels | Configurable (e.g., 2 or 4 channels) based on the installed input cards |
| Power Supply | Powered by the 3500 rack; typically +24 VDC from the system power supply. |
| Operating Temperature | 0°C to +65°C (32°F to 149°F) |
| Input Card: 176449-02 | |
| Description | Velocity Sensor Input Card |
| Compatible Inputs | Seismic Velocity Transducers (e.g., 4-20 mA loop-powered transmitters) |
| Measurement | Casing Vibration (Velocity) |
| Standard Range | Configurable, typically 0-25.4 mm/s (0-1.0 in/s) peak |
| Frequency Response | As defined by the connected velocity transducer (typically 4.5 Hz to 1 kHz) |
| Total Assembly Weight | Approx. 0.6 kg (1.32 lb) |
*Note: This assembly's exact configuration, including the number of active channels and their specific range, is defined by the "-01-00" suffix and the system's software configuration. The 176449-02 card is specifically designed to interface with and power industry-standard velocity transmitters.*
Application Scenarios
This assembly is used for monitoring the absolute vibration of machine casings and structures across various industries.
Turbine Casing Vibration Monitoring:
Used to monitor the absolute vibration of steam and gas turbine casings, bearings, and foundations. This provides crucial data on the overall mechanical health of the turbine structure, complementing shaft vibration measurements.
Motor and Pump Casing Monitoring:
Installed on critical motors, pumps, fans, and blowers to monitor bearing housing vibration. The velocity input is ideal for detecting overall vibration severity caused by imbalance, misalignment, and looseness.
API 670 Compliant Machinery Protection:
Serves as the monitoring and alarm unit for casing vibration channels in a machinery protection system designed to meet API 670 standards, ensuring reliable and standardized protection for critical assets.
Plant-Wide Machinery Protection:
Deployed in 3500 racks throughout a facility to provide consistent and reliable casing vibration monitoring for hundreds of machines, feeding data into the central DCS for operator awareness and alarm management.
Retrofit and System Upgrades:
Used to upgrade existing casing vibration monitoring points by replacing older stand-alone monitors with an integrated 3500 system, improving reliability, providing better diagnostics, and centralizing data.
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