Introduction
The part number 3500/93 135799-02 refers to a specific variant of the Bently Nevada 3500/93 Relay Module. This module is a critical output component within the 3500 Machinery Protection System, designed to convert alarm decisions from monitoring modules (like vibration, speed, or temperature monitors) into physical, hardwired relay contacts. These contacts are used to initiate emergency shutdowns, activate alarm annunciators, or start secondary systems. The "135799-02" suffix indicates a specific factory configuration or hardware revision. The 3500/93 module is available in various configurations, including 4 or 8 relay channels, with options for latching or non-latching operation.
Technical Parameters
The following table outlines the key technical specifications for a typical 3500/93 Relay Module.
| Parameter Category | Specification |
|---|---|
| Part Number | 3500/93 135799-02 |
| Description | Relay Module for 3500 System (Typically a 4-Channel Version) |
| Physical Dimensions (H x W x D) | Approximately 128 mm x 40 mm x 200 mm (5.04 in x 1.57 in x 7.87 in) *Standard single-slot module for a 3500 rack.* |
| Weight | Approximately 0.7 kg (1.5 lbs) |
| Relay Channels | Commonly 4 or 8 independent relays per module. |
| Relay Contact Type | Form C (SPDT - Single Pole Double Throw) |
| Contact Rating | Typically 5 A at 30 VDC / 250 VAC resistive. |
| Relay Type | User-configurable as Latching or Non-Latching (requires a reset command or automatically resets). |
| Power Supply | Powered by the 3500 rack via the backplane (from the 3500/53 Power Supply). |
| Input Control | Receives trip commands from other monitoring modules in the rack via the backplane. |
| LED Indicators | Per channel: Relay Active status. |
| Operating Temperature | 0°C to 65°C (32°F to 149°F) |
*Note: The exact configuration (number of relays, latching logic) for the specific "135799-02" variant must be confirmed from the factory configuration files or the module's label. The values above are representative of the 3500/93 product family.*
Application Scenarios
The 3500/93 Relay Module is the final safety link in a machinery protection system, taking the electronic alarm signal and performing a physical action. Its applications are universal across industries.
Emergency Shutdown (ESD) of Critical Turbines and Compressors:
When a vibration or speed monitor (e.g., 3500/42, 3500/25) detects a Danger condition, it commands the 3500/93 to de-energize its relay. This opens the circuit to the turbine's fuel solenoid or compressor's anti-surge valve, causing a safe and immediate shutdown to prevent catastrophic damage.
Alarm Annunciation:
Upon an Alert (warning) condition from any monitor, the relay is energized/de-energized to trigger a visual and audible alarm in the control room, alerting operators to a developing problem before it requires a shutdown.
Process Control Interlocks:
Used to start or stop auxiliary equipment. For example, a high Vibration Alert from a pump could trigger a relay to start a standby pump in parallel.
Fire and Gas System Integration:
Can be configured to trigger plant-wide emergency systems if a machinery fault is severe enough to pose a safety risk, such as a seal failure leading to a gas release.
Power Generation Plants:
Used throughout the plant to protect generators, boiler feed pumps, and fans. The relay's hardwired output provides a failsafe interface with the plant's main distributed control system (DCS).
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