Introduction
The 3500/50 286566-02 is a Dual-Channel Relay Module for the Bently Nevada 3500 Machinery Protection System. It is not a sensor input module, but a critical output device that converts the system's alarm and trip decisions into physical, hardwired relay contacts. Each module provides two Form-C (SPDT - Single Pole, Double Throw) relay outputs, which can be independently configured by the system software to actuate based on any monitored parameter (e.g., vibration, speed, temperature). This allows the system to directly execute actions such as initiating an emergency shutdown, activating auxiliary alarms, or starting backup equipment.
Parameters
The key technical parameters and physical specifications of the module are summarized in the table below.
| Parameter Category | Specification Details |
|---|---|
| Channels | 2 independent relay channels |
| Relay Type | Form-C (SPDT) - Normally Open (NO), Normally Closed (NC), and Common contacts per channel. |
| Contact Rating | Typically 2 A @ 30 VDC or 0.5 A @ 120 VAC (resistive load). Note: Exact ratings should be verified against the latest manufacturer's manual. |
| Configuration | Fully software-configurable via the 3500 configuration software. Each relay can be assigned to any alarm or trip condition from any monitor module in the rack. |
| Status Indicators | LED per channel indicates relay state (energized/de-energized). |
| Communication | Integrates directly into the 3500 rack; receives commands from the system's Monitor and Framework modules. |
| Dimensions (H x W x D) | Approximately 310 mm x 20 mm x 200 mm (Standard 3500 series rack slot size) |
| Weight | Approximately 0.45 kg (1.0 lb) |
| Part Number | 286566-02 (Revision 02) |
| Rack Compatibility | Bently Nevada 3500 Series Racks |
Application Scenarios
The 3500/50 Relay Module is used in any scenario where a automated physical action must be triggered based on machinery condition. Its applications are defined by its programmable logic rather than a specific machine type:
Emergency Shutdown (ESD) / Trip Functions:
The most critical application. When a vibration, speed (overspeed), or temperature value exceeds a dangerous threshold, the relay de-energizes to open a safety circuit, commanding the turbine or compressor to shut down immediately, preventing catastrophic damage.
Alarm Annunciation:
To activate external warning lights, horns, or annunciator panels when an Alert (warning) level is reached, prompting operator investigation before a trip occurs.
Control Logic & Sequence Switching:
Starting auxiliary lubrication pumps or cooling fans when bearing temperature rises.
Switching control loops or diverting process flow upon a machinery fault.
Unit/System Interface:
Providing a simple, reliable contact closure signal to the plant's Distributed Control System (DCS) or Programmable Logic Controller (PLC) to indicate the status (Normal/Alarm/Trip) of the machinery protection system.
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