Product Overview

The Bently Nevada 149986-02 is a high-integrity Relay Control Module designed for the 3500 Machinery Protection System. This full-height module provides four independent relay outputs, functioning as the primary interface for triggering automated safety actions, emergency shutdowns, and external alarm annunciation. Engineered to process logic signals directly from the rack's backplane, the 149986-02 translates complex vibration and position alarm statuses into physical contact closures, ensuring that critical machinery is protected the moment a hazardous condition is detected.

As a part of the 3500/32M series, this module is optimized for versatility and high-speed response. It can be installed in any available slot to the right of the Transient Data Interface (TDI) module, allowing for flexible rack configurations. The unit is specifically designed for industrial environments where "voted" logic is required to prevent nuisance trips while maintaining a fail-safe posture for high-value rotating assets.

Control Logic and Switching Performance

The 149986-02 features four Single-Pole Double-Throw (SPDT) relays, each capable of handling significant electrical loads. With a contact capacity of 5A at 24V DC or 250V AC, these relays are suitable for direct integration with heavy-duty solenoids, motor starters, and plant-wide Distributed Control Systems (DCS). A key performance metric of this module is its switching response time of less than 10ms, which is critical for preventing mechanical damage during high-velocity machine failures.

Reliability is further enhanced by the module's low power consumption (≤5W) and its broad operating tolerance. It utilizes the rack's internal 24V DC supply, ensuring that relay states are maintained even during minor voltage fluctuations. The module is fully compatible with the standard 3500 rack alarm and hazard logic, providing a seamless bridge between digital monitoring and physical plant safety infrastructure.

Technical Specifications

• Model Number: 3500/32M

• Order Number: 149986-02

• Module Type: Relay Control Module (Full-Height)

• Relay Channels: 4 Independent SPDT (Single-Pole Double-Throw)

• Contact Capacity: 5A @ 24V DC / 250V AC

• Switching Response Time: < 10ms

• Input Voltage: 24V DC (±10%)

• Power Consumption: ≤ 5 Watts

• Chassis Dimensions: 24 cm x 2.4 cm x 24 cm

• Net Weight: 0.7 kg

• System Series: 3500 Machinery Protection System

• Manufacturing Origin: USA

Industrial Safety Applications

• Automatic Shutdown Systems: Executing emergency trip sequences for turbines, compressors, and large industrial pumps.

• Alarm Annunciation: Driving local audible sirens and visual beacons in response to Alert and Danger setpoints.

• Redundant Safety Loops: Implementing voting logic to ensure shutdown occurs only when multiple sensors confirm a hazard.

• Control Room Integration: Providing dry contact feedback to PLC or SCADA systems for plant-wide event logging.