Introduction
The 3500/93 135799-02 is a critical safety and control component within the Bently Nevada 3500 system. It is a four-channel relay module designed to convert alarm status signals from the monitoring system (e.g., "Danger," "Alert") into physical, hardwired relay contacts. These contacts are then used to initiate immediate protective actions, such as shutting down a machine (trip) or activating an alarm, to prevent catastrophic damage to expensive industrial assets like turbines, compressors, and pumps. The "-02" suffix typically indicates a specific hardware or firmware revision.
Technical Parameters
The following table summarizes the key technical specifications for the model 3500/93 135799-02.
| Parameter Category | Specification Details |
|---|---|
| Model Number | 3500/93 135799-02 |
| Product Type | 4-Channel Relay Module |
| Part of System | Bently Nevada 3500 Machinery Protection System |
| Number of Channels | 4 independent relay channels |
| Relay Contact Type | Form C (SPDT - Single Pole Double Throw) |
| Rely Contact Rating | Typically 2 A @ 30 V DC / 0.5 A @ 120 V AC (Resistive Load). Must verify with official datasheet. |
| Power Supply | Powered by the 3500 system rack (typically +5 VDC, +15 VDC, and -15 VDC from the rack's power supply). |
| Isolation | Channel-to-channel and channel-to-logic isolation. |
| Status Indicators | LED per channel for relay status (De-energized/Energized) |
| Module Slots | Occupies a single slot in a 3500 series rack. |
| Operating Temperature | 0 to 65 °C (32 to 149 °F) |
| Dimensions (H x W x D) | Approx. 190 mm (H) x 55 mm (W) x 150 mm (D) (Standard 3500 module, 1-slot width) |
| Weight | Approx. 0.5 - 0.7 kg |
Critical Note: *The Bently Nevada 3500 system is a highly engineered safety system. The exact contact ratings, firmware behavior, and configuration details are critical. This information must be verified against the official 3500/93 Data Sheet (D10456) for the specific revision.*
Application Scenarios
This module is used exclusively within the context of a machinery protection system for critical rotating equipment.
Machine Trip / Shutdown:
The primary role. If a vibration, speed, or temperature monitor (e.g., a 3500/42, 3500/45) detects a "Danger" condition, it commands the 3500/93 relay to de-energize. This opens or closes a contact in the emergency shutdown circuit, safely tripping the turbine, compressor, or large motor.
Alarm Annunciation:
A second channel can be configured for an "Alert" condition. When activated, the relay can energize to turn on a warning light on a control panel or send an alarm to the Distributed Control System (DCS), prompting operator investigation before a shutdown is necessary.
Auxiliary Control Functions:
Relay contacts can be used to start or stop auxiliary systems based on machine state. For example, initiating a lube oil pump or opening a bypass valve upon a machine alarm.
Industrial Sectors:
Oil & Gas: Protecting gas and steam turbines in compressor stations and refineries.
Power Generation: Guarding turbines, generators, and large boiler feed pumps in nuclear, fossil, and hydroelectric plants.
Chemical & Petrochemical: Ensuring the safety of critical process compressors and fans.
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