Bently Nevada 3500/32-01-CN 3500 Series 4-Channel Relay Module

Description

To drive external machinery control loops and execute critical protective safety shutdowns, the Bently Nevada 3500/32-01-CN integrates four fully programmable relay outputs into the 3500 series machinery protection rack. This full-height module accepts input logic from other monitors in the rack to control independent, single-pole double-throw (SPDT) relays. Highly configured for critical safety interlocking, the module provides reliable contact state changes based on alarm status and user-defined voting logic designed in the 3500 Rack Configuration Software.

Key Features

• Four independent, programmable Single-Pole Double-Throw (SPDT) relay channels.
• Compatible with standard 3500 series backplanes and slot structures.
• Supports "Normally Energized" (NE) and "Normally De-energized" (NDE) configurations.
• Extensive voting logic capability, allowing logical combinations of Alert and Danger statuses from multiple monitor channels.
• Equipped with onboard health monitoring to ensure relay drive circuitry is functional.
• CN designated option indicating compliance with specific country approval requirements.

Applications

• Executive emergency machinery shutdown systems for steam turbines, gas turbines, and compressors.
• Integration with Distributed Control Systems (DCS) and Programmable Logic Controllers (PLC) for hardwired alarm annunciation.
• Actuating local hazardous area alarm horns, beacons, and auxiliary indicators.
• Interlocking critical process control loops based on physical machinery vibration boundaries.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

While the 3500 system also supports a 16-Channel Relay Module (the 3500/33), the 4-Channel 3500/32 provides robust SPDT Form-C outputs which are typically preferred for direct trip solenoid activation. Ensure that the 3500/32 firmware revision is compatible with your Rack Interface Module (RIM) firmware version before attempting slot allocation changes.

Application Pitfalls & Engineering Notes

When switching highly inductive AC loads (such as heavy solenoid valves or larger motor starters), installing external arc-suppression (RC snubbers) across the contacts is critical to prevent contact erosion and premature welding. Operating close to the 5 A limit without suppression can degrade relay lifespans and lead to dangerous "fail-to-open" states.

Commissioning & Wiring Tips

Always configure the "OK Relay" function correctly inside the configuration panel. Under normal running conditions, we recommend operating safety shutdown loops in a Normally Energized (NE) de-energize-to-trip mode. This ensures that a total loss of instrument control power automatically triggers the safe state of the machinery loop.

Installation Guidelines