Product Description

Overview

The Bently Nevada 149986-01 16-Channel Relay Module is a critical front-card component for the 3500/33 relay system, providing high-density relay outputs for alarms, annunciators, or Emergency Shutdown (ESD) interfacing. Each relay channel operates independently and can be programmed with complex voting logic, ensuring reliable response to machinery alarms while minimizing false trips.

This full-height module integrates seamlessly into the 3500 rack and communicates with 3500-series monitoring modules, enabling flexible and secure machinery protection configurations.

Key Features

Programmable Relay Logic

• Supports 16 individual channels with independent voting schemes, such as 2-out-of-3 or 1-out-of-2 logic, for precise alarm and trip control.

• Channels can respond to alert, danger, or not-OK status from any monitor in the 3500 rack.

Relay Performance and Construction

• Uses SPDT (Form C) relays for versatile wiring options.

• Epoxy-sealed relays ensure consistent operation under high humidity and dusty industrial conditions.

• Built-in arc suppression (250 Vrms) protects contacts and extends module lifespan.

Operation Modes and Safety

• Channels organized in four groups of four, each switch-selectable for Normally Energized (NE) or Normally De-energized (NDE) operation.

• Fail-safe configurations maintain alarm integrity in the event of a power loss.

Diagnostics and Visual Indicators

• Front-panel LEDs provide real-time status:

• OK LED for module health.

• TX/RX LED for rack communication activity.

• Channel Alarm LEDs indicate active relay alarm states.

Modular and Hot-Swappable

• The front module is easily accessible for maintenance.

• Hot-swappable design allows replacement without powering down the entire 3500 rack, minimizing system downtime.

Technical Specifications

Installation Notes

• Requires a corresponding rear I/O module (e.g., 149992-01) for physical wiring connections.

• Ensure proper system configuration and monitor compatibility before hot-swapping.

Applications

• Drives plant alarms, sirens, and ESD interfaces.

• Configurable for industrial machinery protection systems including turbines, compressors, and rotating equipment.

• Integrated with Bently Nevada 3500-series monitors for real-time trip and alert logic.

FAQ

Q: Can all channels be independently programmed?
A: Yes, each of the 16 channels can be set with unique voting logic and alarm thresholds.

Q: Is the module compatible with hot-swapping?
A: Yes, it can be replaced without powering down the rack, provided the system is in a safe state.

Q: What environmental conditions can it handle?
A: Fully rated for -30°C to +65°C and 95% non-condensing humidity.