Description

Bently Nevada 149992-02 | 3500 Series 16-Channel Relay Module

The Bently Nevada 149992-02 is a high-density, full-height 16-channel relay module designed for the 3500 Machinery Protection System. This module acts as a critical interface between the monitoring rack and external control or shutdown systems. It receives alarm and danger status signals from various monitor modules in the rack and translates them into physical relay contact closures. Because it supports 16 independent relay outputs, it offers extensive flexibility for complex voting logic and multi-machine trip configurations. The 149992-02 is specifically engineered to meet failsafe requirements, ensuring that critical machinery remains protected even in the event of a system power loss. Therefore, it is a foundational component for plants prioritizing functional safety and automated asset protection.

Technical Capabilities and Failsafe Design

Every channel on the 149992-02 can be independently programmed for specific alarm conditions via the 3500 Rack Configuration Software. The module features “Failsafe” and “Non-Failsafe” modes, allowing engineers to define the relay behavior during a power interruption or module fault. For instance, in failsafe mode, the relay de-energizes upon an alarm or power loss to trigger a machine trip. Moreover, the module includes comprehensive self-diagnostics that continuously monitor the health of the internal circuitry. Built with industrial-grade materials, this relay module maintains reliable performance in high-vibration and high-temperature environments. Consequently, it minimizes the risk of false trips while ensuring that genuine danger conditions always trigger the appropriate safety response.

Technical Specifications

• Manufacturer: Bently Nevada (Baker Hughes)
• Part Number: 149992-02
• Module Type: 16-Channel Relay Output Module
• System Series: 3500 Monitoring System
• Configuration: Full-height module
• Relay Type: Single-pole, double-throw (SPDT) / Epoxy-sealed
• Response Time: Less than 10 milliseconds (typical)
• Operating Temperature: -30 °C to +65 °C (-22 °F to +149 °F)
• Weight: 0.38 kg (0.84 lbs)
• Dimensions: 25.0 cm x 23.5 cm x 4.1 cm
• Certifications: CSA, ATEX, IECEx (Hazardous area approved)
• Installation Slot: Any slot except the Power Supply and RIM slots

Frequently Asked Questions

Is the 149992-02 compatible with all 3500 monitor modules?

Yes, this relay module can be configured to respond to alarm and danger status signals from any standard 3500 vibration, position, or temperature monitor module via the rack backplane.

What is the difference between Failsafe and Non-Failsafe modes?

In Failsafe mode, the relay is energized during normal operation and de-energizes to signal an alarm or if power is lost. Non-Failsafe mode only energizes the relay when an alarm condition is active.

Can I replace a single relay on the board if it fails?

The 149992-02 is a factory-sealed industrial module; therefore, if a relay fails, the entire module or the specific relay sub-assembly should be replaced to maintain system certification.

Does this module require a specialized terminal block?

Yes, the 149992-02 requires a corresponding 16-channel relay I/O module (typically mounted at the rear of the rack) to facilitate the actual field wiring connections.