149986-02 Bently Nevada 3500 System Relay Control Module

Product Overview

The Bently Nevada 3500/32 (Part Number: 149986-02) is a full-height, 4-channel relay control module engineered for the 3500 Machinery Protection System. This module provides highly configurable, independent relay outputs to execute critical machinery alarm and trip/shutdown commands based on logic derived from monitoring modules in the rack. By translating system alarm statuses into physical contact openings or closures, the 149986-02 module serves as a crucial line of defense, driving external emergency trip systems and safeguarding high-value rotating assets from catastrophic failure.

Technical Configuration

Core Technical Advantages

The 3500/32 149986-02 features a dual-slot configuration consisting of the front-facing main control module and a dedicated rear-facing I/O module. It operates on programmable "voting" logic (e.g., 1-out-of-2 or 2-out-of-4) configured via the 3500 System Configuration Software. This module incorporates an onboard "Not OK" monitoring override that prevents false machine shutdowns during single-transducer faults. The compact form factor supports high-density layout assembly inside standard 3500 equipment racks, while low power draw characteristics maintain stable thermal operation across the entire chassis enclosure.

Technical Specifications

Installation Guide

Mechanical Rack Placement

Insert the main 3500/32 module into any available full-height slot in the front of the 3500 rack chassis (except slots dedicated to the Power Supply or Rack Interface Module). Align the module with the top and bottom guide rails, pushing firmly until it seats into the backplane connectors. Fasten the two integrated captive screws. Install the corresponding 4-channel relay I/O module directly behind it in the rear of the rack.

Field Wiring Protocols

Connect emergency trip and signaling wires to the terminal blocks on the rear I/O module. Strip wire insulation back 7 mm, insert into the screw clamps, and torque to specification. Route low-voltage AC or DC trip circuit cables through separate wire ducts away from high-power phase cords to avoid induced voltage transients.

Software Configuration

Launch the 3500 Rack Configuration Software to assign voting logic parameters to the individual relay contacts. Set the relay channels to either Normally De-energized or Normally Energized configurations based on your plant's fail-safe shutdown engineering standards.

Engineering Advantages

Robust Failure Prevention

The 3500/32 149986-02 offers robust mechanical relay isolation, separating critical emergency control circuits from the internal bus architecture. This design prevents external electrical faults from taking down the core monitoring rack, ensuring uninterrupted asset visibility.

Highly Scalable Logic Output

Engineers can combine multiple 3500/32 modules within a single rack chassis to scale up emergency trip matrices. The seamless communication backplane feeds alarm states across modules instantly, giving engineers a fast execution loop for multi-unit cross-tripping strategies.

Technical FAQs

Q1: What is the main structural difference between the main module and the rear I/O module?

A1: The front-facing main module houses the processing components and voting logic controllers. The rear I/O module contains the physical relay contacts, terminal strip connections, and field wiring infrastructure.

Q2: Can I use this relay module to directly switch high-current 230 Vac motor circuits?

A2: No. The 3500/32 module contacts are rated for a maximum of 30 Vdc or 30 Vac at 2 A. To control high-voltage machinery or large inductive motor starter coils, route this module’s output to trigger an external interposing relay rated for the target high-power load.

Q3: How does the "Normally Energized" software setting improve facility safety?

A3: A "Normally Energized" setting creates a fail-safe circuit configuration. If the 3500 rack experiences a sudden complete loss of control power, the relay contacts instantly drop open, immediately triggering an active machine trip sequence.