Bently Nevada 3500/33-01-00 3500 Series 16-Channel Relay Module

Description

Designed for high-density alarm and shutdown output signaling, the Bently Nevada 3500/33-01-00 integrated relay module serves as a critical node in machinery protection architectures. This module provides 16 discrete relay outputs that can be programmed using highly configurable voting logic to actuate external annunciators, sirens, or emergency shutdown systems based on alarm statuses from other modules in the 3500 rack. By processing inputs directly over the high-speed internal backplane, it ensures rapid response times crucial for rotating machinery asset protection.

Features

• 16 Independent Relay Outputs: Supports individual configuration of each channel to act as normally open (NO) or normally closed (NC) contacts.
• Programmable Voting Logic: Integrates with the 3500 Rack Configuration Software to allow complex AND/OR logic mapping from any monitor channel in the system.
• LED Status Indicators: Active LED feedback on the front panel for each relay channel, facilitating real-time diagnostic checks.
• Dual-Relay Board Options: Utilizes reliable single-pole, double-throw (SPDT) relays for robust contact integrity.
• Hot-Swappable Design: Allows module replacement in fully energized systems without disrupting the operations of adjacent monitor channels.

Applications

• Turbine Trip Systems: Automatic initiation of emergency shutdown sequences for steam and gas turbines.
• Compressor and Pump Protection: Interlocking relay commands with auxiliary cooling pumps or bypass valves.
• Industrial Plant Annunciation: Direct routing of critical alarm signals to control room distributed control systems (DCS) and horn circuits.
• Hazardous Area Interfacing: Segmenting safe-area machinery alarms from high-energy plant shutdown networks.

Ordering Information

Technical Specifications Table

Empirical Engineering Insights

Alternative Models & Compatibility

The 3500/33 module is designed to fit standard Bently Nevada 3500 full-size frames. Unlike the 3500/32 4-channel relay module which requires a specific dual-slot assignment in some older rack revisions, the 3500/33 16-channel module optimizes space by delivering dense control capacity in a single card slot. Always verify that your 3500 Rack Configuration Software is updated to version 3.0 or higher to support the 16-channel voting maps natively.

Application Pitfalls & Engineering Notes

A common issue encountered during commissioning involves using the internal relays to directly switch inductive heavy loads such as solenoids or large contactors. While rated for 2 A resistive switching, switching inductive loads without external suppression (e.g., flyback diodes or RC snubbers) can lead to premature contact welding or excessive EMI noise, which can disrupt adjacent measurement modules in the 3500 rack. We recommend interposing external relays for high-current or highly inductive loads.

Commissioning & Wiring Tips

When configuring the voting logic, make sure that the "normally energized" or "normally de-energized" state of each relay matches your fail-safe requirements. Relay contacts default to their de-energized state upon a total loss of power to the 3500 rack. Secure the field terminal block utilizing the integrated retention screws to avoid contact resistance issues under vibration.

Installation Guidelines