

Introduction to Part 3500/33-01-00 149992-01
The 3500/33-01-00 149992-01 is a 4-Channel Relay Module for the Bently Nevada 3500 system. Its primary function is to provide configurable relay outputs based on the status of monitoring modules (like vibration, speed, or temperature monitors) within the rack. Each of its four independent relays can be programmed to activate (trip) in response to specific conditions, such as a Danger or Alert alarm from any monitor. This module is a critical interface for executing automatic safety actions, such as shutting down machinery, activating auxiliary systems, or sending signals to a plant DCS, thereby protecting critical assets from damage.
Parameters / Specifications
The key technical parameters for the 3500/33-01-00 149992-01 module are summarized in the table below.
| Parameter | Specification | Notes / Explanation |
|---|---|---|
| Model Number | 3500/33-01-00 | Bently Nevada 4-Channel Relay Module |
| Assembly/Revision Code | 149992-01 | Manufacturer's internal assembly number. |
| Product Type | Rack-Mount Relay Module | |
| Compatible Rack | Bently Nevada 3500 Rack | Requires a 3500 series frame for operation. |
| Module Slot Size | Single Slot | Occupies one slot in the 3500 rack. |
| Dimensions (H x W x D) | Approx. 193mm x 55mm x 200mm | Standard dimensions for a 3500 series module. |
| Weight | Approx. 0.7 kg (1.5 lbs) | |
| Power Requirement | +24 VDC (from rack backplane) | Powered by the main rack power supplies. |
| Number of Channels | 4 Independent Relay Channels | |
| Relay Contact Type | Form C (SPDT - Single Pole Double Throw) | Common (C), Normally Open (NO), Normally Closed (NC). |
| Contact Rating | 2 A @ 30 VDC / 0.5 A @ 120 VAC | Standard rating for industrial relay outputs. |
| Relay State | Energized or De-energized on Alarm | Field configurable for fail-safe operation. |
| Configuration | Software-configurable per channel | Each relay can be assigned to any monitor's alert or danger status. |
| Front Panel Indicators | OK, Bypass, and per-channel Relay Active LEDs | LED status indicators for module and relay status. |
| Operating Temperature | -20°C to +65°C | Standard for industrial monitoring hardware. |
Application Scenarios
The 3500/33 Relay Module is the primary output device for taking automatic protective action within the 3500 monitoring system. Its applications are critical for machine safety.
Machinery Shutdown (Trip): The primary use is to de-energize a relay to initiate an immediate shutdown of a turbine, compressor, or pump when a "Danger" level vibration, speed, or temperature is detected.
Alarm Annunciation: Energizing a relay to activate warning lights, horns, or annunciator panels when an "Alert" condition is present, signaling operators to take corrective action.
Sequential Control: Starting or stopping auxiliary systems, such as lube oil pumps or barring gear, based on the operational status (e.g., speed) of the main machine.
Interface with Plant DCS/PLC: Sending a hardwired signal to a Distributed Control System (DCS) or Programmable Logic Controller (PLC) to communicate the alarm or trip status of the monitored machine.
Redundant Protection Schemes: Used in voting systems (e.g., 2-out-of-3) for critical shutdown functions to enhance safety and avoid unnecessary trips.
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