Bently Nevada 3500/32-01-00 3500/32M 4-Channel Relay Module

Product Overview

The 3500/32-01-00 is a high-reliability, full-height 4-channel relay module designed for the Bently Nevada 3500 Machinery Protection System. Within critical industrial environments such as oil refineries, LNG terminals, and thermal power plants, this module serves as the primary physical interface for automated machinery shutdown and alarm notification. The 3500/32-01-00 allows for complex, independent voting logic across its four relay outputs, utilizing AND/OR configurations to process Alert, Danger, and Not-OK statuses from other monitor modules in the rack. By translating digital alarm drive logic into mechanical relay actions, it provides a fail-safe mechanism to protect expensive rotating assets from catastrophic damage, significantly reducing the financial impact of unplanned downtime and ensuring site-wide safety compliance.

Suffix Breakdown

The model code 3500/32-01-00 indicates the following hardware and regulatory specifications:

• 3500/32: Base series for the 4-Channel Relay Module.

• -01 (Output Module): Specifies the inclusion of the 4-Channel Relay I/O Module, which provides the physical connection points for the external alarm and trip circuits.

• -00 (Agency Approval): Indicates the standard version with no specific hazardous area agency approvals, suitable for installation in non-classified general-purpose industrial control rooms.

Technical Specifications

Component Insights & FAQs

Where can this module be placed within the 3500 rack?

The 3500/32-01-00 can be installed in any of the available slots to the right of the Transient Data Interface (TDI) module. Because the rack's backplane communicates digitally, you can add as many relay modules as needed to satisfy your facility's voting logic and emergency shutdown requirements.

Can I configure the relays to stay energized during normal operation?

Yes. Each of the four channels is switch-selectable. You can program them for "Normally De-energized" (relays close on alarm) or "Normally Energized" (relays open on alarm or power loss). The latter is often preferred for fail-safe "Trip" circuits.

How do I verify if a specific channel is in an alarm state?

The module faceplate features dedicated CH ALARM LEDs for each channel. Additionally, the TX/RX LED will flash to confirm active communication with the rack backplane, and the OK LED ensures the internal module circuitry is functioning within parameters.

Engineering & Installation Guide

Voting Logic and Configuration

Utilize the 3500 Rack Configuration Software to program the Alarm Drive Logic. The system supports complex combinations of individual Probe Process Levels (PPLs) and alarming statuses. For critical machinery, we recommend implementing "2-out-of-2" or "2-out-of-3" voting logic to minimize the risk of false trips caused by a single sensor failure while maintaining high-integrity protection.

Relay Contact Protection

While the 3500/32-01-00 comes standard with 250 Vrms arc suppressors, always ensure that the external load does not exceed 5 A at 240 VAC. If you are switching highly inductive loads, such as large solenoids or heavy-duty motor starters, consider using intermediate slave relays or additional external snubbers to extend the contact life of the internal epoxy-sealed components.

Environmental and Thermal Management

Although the module is rated up to 65 deg C, maintaining a stable temperature within the control cabinet will significantly improve the long-term reliability of the mechanical relay components. Ensure adequate airflow within the 3500 rack and avoid placing high-heat generating modules directly adjacent to the relay module if the ambient cabinet temperature is near the upper limit.