Introduction
The assembly 3500/15-02-02-00 125840-01 is a Relay Module and its associated Relay Card for the Bently Nevada 3500 Machinery Protection System. The 3500/15 is a modular chassis designed to house relay cards that convert alarm decisions from the monitoring system into physical, hardwired relay contacts. The 125840-01 is the specific, field-replaceable relay card that contains the actual electromechanical or solid-state relays. This assembly is a critical output component used to initiate alarms, start auxiliary equipment, or safely shutdown machinery to prevent damage. The "-02-02-00" suffix defines a specific configuration for the number of relays, their contact type, and default state.
Parameters / Specifications
The following table outlines the key technical parameters for this relay assembly.
| Parameter | Specification |
|---|---|
| Assembly Designation | 3500/15-02-02-00 (Chassis) & 125840-01 (Relay Card) |
| Description | Relay Module Assembly |
| Chassis: 3500/15-02-02-00 | |
| Physical Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 120 mm (Standard 3500 Series frame slot) |
| Weight (Chassis) | Approx. 0.5 kg (1.1 lb) |
| Primary Function | Modular chassis for housing relay cards |
| Power Supply | Powered by the 3500 rack backplane. |
| Operating Temperature | 0°C to +65°C (32°F to 149°F) |
| Relay Card: 125840-01 | |
| Description | 4-Channel Relay Card |
| Physical Dimensions | A plug-in card designed for the 3500/15 chassis. |
| Weight (Card) | Approx. 0.2 kg (0.44 lb) |
| Number of Relays | 4 independent relays |
| Relay Contact Type | DPDT (Double-Pole, Double-Throw) Form-C contacts |
| Contact Rating | 2 A @ 30 VDC / 0.5 A @ 120 VAC (Resistive) |
| Default State | Configurable (e.g., De-energized to Trip) |
| Total Assembly Weight | Approx. 0.7 kg (1.54 lb) |
*Note: The exact relay configuration, including default state and contact rating, is defined by the specific relay card model (125840-01) and the system's software configuration. This assembly requires a monitoring module (e.g., vibration, speed, temperature) to provide the alarm signal that triggers the relay.*
Application Scenarios
This relay assembly is a fundamental safety and control component in machinery protection systems across various industries.
Machine Shutdown (Trip):
The primary application is to safely shutdown rotating equipment (turbines, compressors, pumps) by breaking the circuit to the prime mover's shutdown solenoid when a "Danger" alarm condition is detected, preventing catastrophic failure.
Alarm Annunciation:
Used to activate visual and audible alarms in the control room or locally when an "Alert" (warning) or "Danger" condition is detected, prompting operator attention.
Sequencing and Control:
Initiating auxiliary sequences, such as starting standby lubrication pumps, opening diversion valves, or activating annunciator panels when a specific machine fault is identified.
Multi-Point Protection:
With its four independent relays, a single assembly can be configured to provide separate shutdown commands for different fault conditions (e.g., high vibration, high temperature, low oil pressure) on the same machine.
Process Safety in O&G and Power Generation:
A key component in Safety Instrumented Systems (SIS) and machinery protection logic for critical assets in industries like oil & gas, petrochemical, and power generation, where equipment failure can have severe consequences.
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