Bently Nevada 3500/33 162291-01 Relay Module – Configurable Alarm Output

This relay module provides programmable alarm and shutdown outputs for machine protection. It integrates seamlessly into the Bently Nevada 3500 monitoring system platform. The unit offers field-configurable relay mapping for customized protection strategies. Users can connect external annunciators, PLCs, and emergency shutdown systems through this interface.

Relay Output Configuration and Contact Specifications

This module features four independent relay outputs with flexible contact configurations. Each relay provides Form C contacts with both normally-open and normally-closed terminals. The contacts handle 5 A at 115 V AC or 2 A at 30 V DC for versatile load control. Each output includes individual LED indicators for clear status visualization. The module supports both latching and non-latching operation modes for application flexibility.

Channel Assignment and Relay Mapping

The 3500/33 162291-01 allows users to assign any monitoring channel to any relay output. This flexible mapping enables customized protection logic for each machine. Users can configure multiple channels to trigger a single relay for combined alarms. Alternatively, one channel can activate multiple relays for diverse output actions. The module stores these assignments in non-volatile memory for automatic reloading. This configuration ensures consistent protection even after power cycles.

Alarm Logic and Operating Modes

This module supports various alarm logic configurations for different protection needs. Users select from “alert,” “danger,” or “combined” activation conditions. The unit also offers both latching and non-latching operation modes. Latching mode retains alarm states until the operator manually resets the relay. Non-latching mode automatically resets when the alarm condition clears. Furthermore, the module includes time-delayed activation for nuisance trip prevention. These options accommodate diverse machine protection requirements.

Bypass Function and Maintenance Support

The module incorporates a channel bypass function for safe maintenance activities. Users can temporarily disable specific inputs to prevent false alarms during servicing. This feature allows technicians to work on transducers without triggering unnecessary shutdowns. The bypass status remains clearly visible through front-panel indicators. After completing maintenance, users simply re-enable the channel for normal operation. This functionality reduces downtime and improves maintenance efficiency.

System Integration with 3500 Rack

This relay module communicates with the 3500 rack through the dedicated backplane bus. It receives digital alarm signals directly from monitoring modules. The unit automatically synchronizes with the rack interface module for system-wide coordination. It requires the 3500 configuration software for advanced setup and mapping. This software provides intuitive tools for relay assignment and mode selection. Consequently, users can implement complex protection strategies without custom programming.

Power Consumption and Environmental Durability

The module draws 350 mA at 24 V DC from the 3500 rack power supply. Power dissipation remains below 6 W under normal operating conditions. The unit operates reliably between -10 °C and 65 °C ambient temperature. Humidity tolerance spans 0% to 90% without condensation issues. The module carries an IP20 rating for protection against solid objects. This robust design suits power generation, oil and gas, and heavy industrial facilities.