Introduction
The component with part number 3500/60-01-00 133819-01 is a specialized monitoring module within the Bently Nevada* 3500 Machinery Protection System. This part number refers to the 3500/60 Speed Monitor.
This module is specifically engineered to monitor the rotational speed (RPM) of a machine. It accepts input signals from various speed sensors, such as magnetic pickups (MPUs) or proximity probes, and provides critical speed-related protection functions. It is essential for overseeing startup, shutdown, and continuous operation, ensuring the machine remains within safe speed limits and protecting against overspeed conditions, which are among the most serious hazards for rotating equipment.
*Bently Nevada is a part of Baker Hughes.
Parameters
The following table outlines the key technical parameters for the 3500/60-01-00 133819-01 monitor.
| Parameter | Specification |
|---|---|
| Part Number | 3500/60-01-00 133819-01 |
| Module Type | Speed Monitor |
| Compatibility | Bently Nevada 3500 Series Racks |
| Number of Channels | 2 independent channels |
| Input Signal | Accepts signals from Magnetic Pickups (MPUs) or Proximity Probes. |
| Speed Range | Programmable over a wide range, typically from very low RPM (e.g., for turning gear) to high RPM (e.g., 50,000 RPM or more). |
| Programmable Setpoints | Up to four configurable setpoints per channel (e.g., for Alarm, Danger/Overspeed, Bypass, etc.). |
| Keyphasor® Function | Can condition an input signal to provide a Keyphasor reference for the entire monitoring system. |
| Primary Function | Monitors rotational speed, provides programmable alarms and dangerous overspeed shutdown protection. |
| 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 3500/60 Speed Monitor is a critical safety module used to protect machinery where speed is a fundamental parameter. Its application scenarios are vital for preventing catastrophic failures.
Overspeed Protection:
This is its most critical function. The module continuously compares the measured speed against a pre-set "Danger" limit. If this overspeed setpoint is exceeded, it immediately initiates a shutdown signal to the turbine control system to prevent mechanical disintegration.
Startup and Shutdown Sequencing:
Used to monitor and control the acceleration and deceleration of a machine through critical speeds. It can provide alarms or control signals at specific setpoints during these transient periods.
Zero Speed and Low Speed Monitoring:
Used to confirm that a machine has come to a complete stop (zero speed) for safe maintenance or to monitor slow-roll (turning gear) speed.
Speed-based Alarm Functions:
Provides early warning (Alert alarms) for abnormal speed conditions and can activate other systems, such as anti-surge controls for compressors, based on speed setpoints.
Providing a Keyphasor Reference:
When configured with a proximity probe input, it can generate a clean Keyphasor signal for the entire 3500 rack, providing the necessary timing reference for vibration phase measurement.
Typical Machinery Protected:
Steam Turbines and Gas Turbines
Centrifugal Compressors
Turboexpanders
Any high-speed rotating equipment where overspeed can lead to catastrophic failure.
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