Introduction
The component with part number 3500/33 149992-03 is a 16-Channel Relay Module within the Bently Nevada* 3500 Machinery Monitoring System. This module serves as a high-density output interface, providing a large number of configurable relay contacts.
Its primary function is to execute physical actions based on the status and alarm conditions generated by other monitoring modules within the 3500 rack. It does not monitor machinery parameters directly but acts as the system's "action arm," enabling functions like alarm annunciation, sequential control, and system status indication by opening or closing its relay contacts in response to programmed logic.
*Bently Nevada is a part of Baker Hughes.
Parameters
The following table outlines the key technical parameters for the 3500/33 149992-03 Relay Module.
| Parameter | Specification |
|---|---|
| Part Number | 3500/33 149992-03 |
| Module Type | 16-Channel Relay Module |
| Compatibility | Bently Nevada 3500 Series Racks |
| Number of Relays | 16 independent relays |
| Relay Contacts | Form-C (SPDT - Single Pole Double Throw) |
| Contact Rating | Typically 2 A at 30 VDC or 120 VAC |
| Logic | Each relay is individually programmable (e.g., energized/de-energized on Alarm, Danger, or OK status). |
| Input Source | Activated by status signals from other monitoring modules in the rack. |
| Primary Function | Provides configurable relay outputs for alarm annunciation, control functions, and system status. |
| Power Requirement | Powered directly from the 3500 rack backplane. |
| Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 200 mm (7.5 in x 1.6 in x 7.9 in) *Standard 3500 Series full-size module slot.* |
| Weight | Approx. 0.45 kg (1.0 lb) |
Application Scenarios
The 3500/33 is deployed in complex systems requiring numerous discrete output signals for comprehensive machine management and integration with plant-wide systems.
Comprehensive Alarm Annunciation:
Drives large annunciator panels or provides individual inputs to a DCS/PLC for a wide range of specific faults (e.g., "High Vibration Bearing A", "Low Lube Oil Pressure"), giving operators detailed diagnostic information.
Auxiliary Equipment Control:
Automates the control of support systems. For example, it can start a backup lube oil pump on low pressure or open a vent valve upon compressor shutdown.
Sequencing and Permissive Interlocks:
Provides relay outputs for complex startup/shutdown sequences and creates safety interlock circuits that prevent machine operation unless all preconditions are met.
System-Wide Status Indication:
Dedicated relays report on the health of the 3500 system itself, such as "System OK", "Power Supply Fault", or "Module Fault", providing crucial diagnostics for maintenance.
High-Density Interface to Plant Controls:
Acts as a robust interface to other systems like PLCs, ESD (Emergency Shutdown Systems), or fire and gas systems that require hardwired signals from the machinery protection system.
Typical Machinery Systems:
Large Gas & Steam Turbine Generator Sets
Complex Centrifugal Compressor Trains
Power Generation Plant Auxiliary Systems
Any critical machinery train requiring extensive alarm and control logic.
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