Bently Nevada 3500/33-SIL2-03-R0 Relay Output Module

This relay output module provides reliable alarm and trip signals for Bently Nevada 3500 monitoring systems. It activates shutdown sequences and alerts operators when machinery parameters exceed safe limits. The module meets SIL 2 requirements for functional safety-critical applications.

Output Configuration and Relay Specifications

The Bently Nevada 3500/33-SIL2-03-R0 offers eight independent relay outputs, each with SPDT (Form C) contacts. Each relay handles a maximum current of 5 A at 120 VAC or 2 A at 24 VDC. The module’s onboard processor continuously evaluates channel states and updates relays accordingly. It includes an optional manual reset pushbutton and a trip-multiply function for sequencing. A key-operated reset switch secures the reset function against unauthorized operation.

Technical Specifications

Safety Features and Diagnostic Functions

The module continuously performs diagnostic self-tests on all output channels for reliability. Any detected fault triggers an alarm indication and will cause the outputs to de-energize for safety. The trip-multiply function allows sequenced shutdowns controlled by other modules. The optional manual reset button must be pressed after a fault clears to restore operation. The key-operated reset switch prevents accidental resets by unauthorized personnel.

System Integration and Application Use

This module forms the final element of the 3500 protection system, acting on decisions from the monitor modules. It connects directly to the shutdown system, alarms, and annunciators in the plant. The SIL 2 rating makes it suitable for use in safety instrumented functions. Its 8 relays provide ample capacity for most turbine and compressor protection applications. The module’s robust construction ensures long-term reliability in harsh environments.