Product Overview

The 3500/20 (125744-02) is the primary Rack Interface Module (RIM) for the Bently Nevada 3500 Series Machinery Protection System. It serves as the essential communication bridge between the 3500 rack and the configuration/monitoring software. The 125744-02 is responsible for managing the rack-level configuration, supporting System 1 connectivity, and facilitating data exchange between internal monitoring modules. This module is typically installed in the slot immediately to the right of the power supplies and is required for every 3500 rack to function as a coordinated system.

Technical Specifications

• Manufacturer: Bently Nevada (Baker Hughes)

• Model Number: 3500/20

• Part Number: 125744-02

• Product Type: Rack Interface Module (RIM)

• Power Consumption: 4.75 W (Typical)

• Communication Protocols: Proprietary Bently Nevada Protocol; RS232/RS422 serial support

• Baud Rate: Up to 38.4 kbaud

• Internal Backplane Interface: High-speed parallel bus

• I/O Support: Compatible with standard RIM I/O modules and Data Acquisition (DAQ) I/O

• Operating Temperature: -30°C to +65°C (-22°F to +149°F)

• Storage Temperature: -40°C to +85°C (-40°F to +185°F)

• Humidity: 95% non-condensing

• Dimensions (H x W x D): 241 mm x 24.4 mm x 242 mm (Full-height module)

• Weight: 0.9 kg (2.0 lbs)

Key Functional Features

The 125744-02 is more than a communication card; it is the "brain" of the rack’s administrative layer.

• Configuration Management: Stores the rack configuration and facilitates the download of parameters from the 3500 Rack Configuration Software to individual monitor modules.

• System Diagnostics: Monitors the status of all modules in the rack, providing "OK" status relay contacts and visual LED indicators.

• Data Buffering: Supports the collection of static and dynamic data for higher-level plant asset management software like System 1.

• Safety Integrity: Designed to meet stringent industrial safety standards, ensuring that communication overhead does not interfere with the primary protection functions (trips) of the monitor modules.