Introduction
The Bently Nevada 3500/33-02-00 149992-02 is a specific hardware revision of the 3500/33 Relay Module, a critical component within the GE Bently Nevada 3500 Machinery Protection System. This module serves as a highly reliable interface between the monitoring system and external control circuits.
Its primary function is to convert system alarms, warnings, or shutdown signals generated by other monitoring modules (like vibration or speed monitors) into physical, isolated relay contact closures. These relay contacts are then used to activate or deactivate external devices such as annunciators, PLCs, alarm horns, or even initiate a safe shutdown of the machinery. The "-02" revisions indicate specific manufacturing updates or component changes, ensuring improved reliability and performance. This module is essential for taking automated, safety-critical actions based on machinery health.
Parameters / Specifications
The key technical specifications for the Bently Nevada 3500/33-02-00 149992-02 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 3500/33-02-00 149992-02 |
| Product Line | GE Bently Nevada 3500 System |
| Module Type | Relay Module |
| Number of Relays | 4 (independently configurable) |
| Relay Contact Rating | 2 A @ 30 V DC / 0.5 A @ 120 V AC |
| Relay Contact Type | Form C (SPDT - Single Pole, Double Throw) |
| Isolation | 1500 V RMS (channel-to-channel and channel-to-ground) |
| Power Supply | Derived from the 3500 Rack (redundant power supplies supported) |
| Communication | Via the rack's backplane with other 3500 modules |
| Status Indicators | LED for each relay status (Active/Not Active) |
| Configuration | Configured via the 3500 Rack Configuration Software |
| Dimensions (H x W) | Standard 3500 Series Module (Approx. 3.9" x 8.7" or 99 mm x 221 mm) |
| Weight (Approx.) | 1.2 lbs (0.54 kg) |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) |
Application Scenarios
The 3500/33 Relay Module is deployed as the final "action" component in a machinery protection system. It is used wherever a reliable, hardwired signal is required based on a machine's condition.
Typical application scenarios include:
Critical Machinery Shutdown (Trip):
The most vital application. When a 3500/42M Speed Monitor detects an overspeed condition or a 3500/25 Vibration Monitor detects excessive vibration, it commands the 3500/33 to de-energize its relay. This contact closure directly initiates an emergency shutdown of the turbine, compressor, or pump to prevent catastrophic failure.
Alarm Annunciation:
Triggering visual and audible alarms on a control room panel when an early warning condition (e.g., high vibration alarm, high temperature alarm) is detected. This allows operators to investigate and take corrective action before a shutdown is necessary.
Interfacing with Plant Control Systems:
Sending machine status signals to a Plant's Distributed Control System (DCS) or Programmable Logic Controller (PLC). For example, signaling the DCS to reduce load on a machine, start a backup lubrication pump, or log a maintenance event.
Redundant/Safety-Certified Systems:
Used in conjunction with TMR (Triple Modular Redundant) modules like the 3500/42M. In such systems, multiple 3500/33 relays can be wired in series or parallel to implement 2-out-of-3 (2oo3) voting logic for the final shutdown circuit, ensuring both safety and availability.
Industries of Use:
Oil & Gas (Pipeline compressors, offshore platforms)
Power Generation (Gas & Steam Turbines)
Petrochemical & Refining
Water & Wastewater Treatment
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