The Bently Nevada 3500/33 is a high-density, 16-channel relay module designed for the 3500 Series Machinery Protection System. This module provides 16 relay outputs that can be programmed to trigger based on alarm levels (Alert and Danger) detected by other monitors in the 3500 rack. The 149986-01 is the standard 16-channel version, often paired with the PWA 184631-01G (the Printed Wiring Assembly). This module is essential for automated machinery shutdown and local annunciation, providing a physical interface between the digital protection logic and external control circuits.
Technical Specifications
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Model Number: 3500/33 (149986-01)
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PWA Part Number: 184631-01G (RoHS Compliant)
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Manufacturer: Bently Nevada (Baker Hughes)
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Number of Channels: 16 Relay Outputs
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Relay Type: Single-Pole, Double-Throw (SPDT)
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Contact Rating: 5A @ 24 VDC / 240 VAC (Resistive)
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Environmental Sealing: Epoxy sealed relays
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Power Consumption: 5.8 watts typical
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Dimensions: 24.1 cm x 2.4 cm x 10.3 cm
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Weight: 0.82 kg
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Country of Origin: USA
Applications
The 3500/33 module is used in critical machinery protection applications where multiple discrete outputs are required for complex voting logic. It is commonly found in power plants, refineries, and offshore platforms monitoring gas turbines, steam turbines, and large compressors. The 16 channels allow for highly granular control, such as triggering separate alarms for individual bearings or managing multi-stage shutdown sequences across an entire machine train.
Operating Instructions
The 3500/33 must be installed in a full-size slot of the 3500 rack, typically to the right of the Power Supply and Rack Interface Module (RIM). Before installation, ensure the rack is powered down or follow “hot-swap” procedures outlined in the 3500 System Manual. The 149986-01 module requires a matching 16-channel I/O Termination Module at the rear of the rack to connect field wiring. Configuration of the relay logic (Voting, Latching/Non-latching, Normally Energized/De-energized) is performed via the 3500 Rack Configuration Software. After configuration, it is vital to perform a “Relay Test” using the software to verify that the physical contacts transition correctly before the machinery is brought online.
Frequently Asked Questions
Q: What is the difference between “Normally Energized” and “Normally De-energized”? A: A “Normally Energized” relay (also known as Fail-Safe) stays powered during normal operation; if the system loses power, the relay changes state to trigger an alarm. “Normally De-energized” only powers up the relay when a specific alarm condition is met.
Q: Can I use this module for Triple Modular Redundant (TMR) applications? A: While the 3500/33 provides 16 individual relays, TMR systems often use the 3500/32 (4-Channel Relay Module) for hardware-level voting. However, the 3500/33 can be programmed for complex software-based voting logic within the configuration environment.
Q: Does the “G” in 184631-01G mean anything specific? A: Yes, the “G” suffix indicates that the assembly is “Green,” meaning it is RoHS (Restriction of Hazardous Substances) compliant, utilizing lead-free soldering and materials.
Recommended Similar Models
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Bently Nevada 3500/32 (4-Channel Relay Module)
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Bently Nevada 3500/34 (TMR Relay Module)
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Bently Nevada 3500/42M (Proximitor Seismic Monitor)
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Bently Nevada 3500/22M (Standard Transient Data Interface)
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Bently Nevada 3500/15 (High Tech Power Supply)
