The Bently Nevada 3500/32 125712-01+125720-01, also cataloged as the 3500/32 Relay Output Module, operates as a dedicated hardware component for executing alarm-driven contact closures within 3500 rack monitoring systems.

Suffix & Assembly Breakdown

• 125712-01: Relay Output Module base unit.

• 125720-01: I/O module with terminal blocks for relay output termination.

Hardware Specifications

Mechanical Monitoring & TSI Integration

The 3500/32 module integrates into the 3500 rack to provide output signals based on alarm conditions identified by other rack modules. To ensure mechanical protection integrity, the module supports cross-talk suppression by isolating relay switching transients from the backplane communication bus. During configuration, users must ensure eddy-current probe scaling and logic mapping in the Rack Interface Module (RIM) correlate correctly with the relay setpoints. Gap voltage validation is not a direct input for this relay module; however, relay logic is dependent on the -10 VDC targets and alarm levels established in the channel configuration of the primary monitoring modules.

Ordering Info

• One (1) 3500/32 Relay Output Module.

• One (1) 3500/32 I/O Module.

• Terminal block kit for field wiring.

• Installation and configuration documentation.

Field Installation Guidelines

• Backplane Insertion: Verify the rack is powered and the slot is configured; insert the module until the connectors are fully seated on the backplane bus.

• Wiring Termination: Connect field devices to the I/O module terminal blocks; observe current and voltage ratings for the relay contacts to prevent contact welding.

• Grounding: Secure the relay cabling shields to the designated rack ground point to minimize noise pick-up on sensitive alarm circuits.

• Software Configuration: Use 3500 Rack Configuration Software to define alarm logic, relay latching behavior, and voting logic requirements.

Frequently Asked Questions

• Is the 3500/32 module hot-swappable? Yes, the module supports hot-swapping; however, ensure that connected relay output loads are de-energized if safety protocols require isolation during maintenance.

• How many relay channels are provided? The module provides four independent relay output channels, each configurable for alarm setpoint mapping.

• Can the relays be programmed for voting logic? Yes, relay logic can be configured for AND/OR voting logic combinations within the 3500 rack software.

• Are the relays normally open or closed? The module supports both normally open (NO) and normally closed (NC) contact configurations via jumper or software settings.

• How are faults detected? The 3500/32 module performs internal diagnostics; relay health and communication status are reported to the RIM (Rack Interface Module).

• Does it require external excitation? The relay contacts are dry; they require an external power source provided by the user to energize the downstream alarm or trip circuit.

• What is the maximum contact rating? Check the technical manual for specific contact current and voltage limits to prevent damage to the relay switching mechanism.

• Can I upgrade the firmware? Firmware updates are managed through the 3500 system software; verify the current module revision before attempting an upgrade.