3500/20-01-02-00 (125768-01) Monitoring System Module
Description:
The 3500/20-01-02-00, also known by the alternate part number 125768-01, is a Vibration Monitor module for the Bently Nevada 3500 Machinery Monitoring System. This module is a critical component for protecting and monitoring rotating machinery by processing signals from proximity probes to measure shaft relative vibration.
It is a dual-channel monitor that accepts input from two non-contact eddy current proximity probes (typically 8 mm). The module processes these signals to provide continuous, real-time monitoring of vibration amplitude (peak-to-peak in mils or µm) and a gap voltage (DC voltage proportional to the average distance between the probe and the shaft). It provides alarm trips (Alert and Danger) to initiate shutdowns or warnings, preventing catastrophic machinery failure.
Parameters & Specifications
The following table details the key parameters for this module. The part number suffix -01-02-00 specifies its hardware configuration and firmware version.
| Parameter | Specification |
|---|---|
| Primary Part Number | 3500/20-01-02-00 |
| Alternate Part Number | 125768-01 |
| Module Type | Dual-Channel Vibration Monitor |
| Compatibility | Bently Nevada 3500 Rack Frame |
| Slot Requirement | Single Slot |
| Typical Dimensions (H x W x D) | Approx. 193 mm x 27 mm x 170 mm (7.6 in x 1.06 in x 6.7 in) |
| Typical Weight | Approx. 0.4 kg (0.88 lbs) |
| Input Channels | 2 independent channels for eddy current probes |
| Input Signal | From 8 mm (or 5 mm/11 mm) proximity probes; requires an external -18 to -26 VDC power supply for the probes. |
| Dynamic Signal Range | Vibration: 0 to 400 µm pk-pk (0 to 16 mils pk-pk) Gap: -2 V to -18 V DC |
| Frequency Response | Typically 0.4 Hz to 10,000 Hz |
| Scale Factor | User-configurable; standard is 7.87 V/mm (200 mV/mil) |
| Alarm Relays | Two per channel (Alert & Danger); Form C relay contacts |
| Power Supply | Powered by the 3500 system backplane |
| Operating Temperature | -30°C to +65°C (-22°F to +149°F) |
| Primary Output | Vibration and Gap signals to the 3500 Framework software and relay modules. |
*Note: The exact dimensions and weight are approximate. The specific firmware and configuration options are defined by the part number suffix. For critical applications, always refer to the official 3500/20 Hardware Reference Manual.*
Application Scenarios
The 3500/20 Vibration Monitor is a primary protection device used in a vast range of industrial applications where monitoring the shaft's relative motion is essential for operational safety and asset protection.
Shaft Relative Vibration Monitoring: This is the core application. The module is used to monitor the dynamic movement of a rotor relative to its journal bearings on critical equipment, providing early warning and protection against:
Rotor Imbalance
Shaft Misalignment
Oil Whirl/Whip
Rotor Rubs
Machine Protection System (MPS): It serves as a fundamental input to a turbine or compressor's protection logic. The "Danger" alarm output is typically hardwired to the emergency shutdown system to prevent catastrophic mechanical failure.
Radial Vibration Monitoring on Turbines and Compressors: Installed on both inboard and outboard bearings (X and Y directions) to provide a full picture of the rotor's dynamic behavior.
Gap Voltage (DC Gap) Monitoring: The DC voltage output is monitored to detect slow-moving changes in the shaft position relative to the probe, which can indicate:
Shaft Centering Shifts within the bearing clearance.
Probe Health and Integrity.
Predictive Maintenance: By trending vibration and gap data over time, maintenance teams can identify developing faults and plan repairs during scheduled outages, avoiding unplanned downtime.
Typical Machinery:
Steam Turbines & Gas Turbines
Centrifugal & Axial Compressors
Syngas Compressors
Large High-Energy Pumps
Turbo-expanders
Electric Motors
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