Bently Nevada 3500/33 149986-01 | 16 Channel Relay Control Module

• Brand: Bently Nevada
• Full Model Number: 3500/33 149986-01
• Lifecycle Status: Active / Lifecycle-managed
• Core Function: 16-channel relay control module for the 3500 Machinery Protection System
• Top 3 Technical Specs: 16 programmable relay channels; full-height front module; Alarm Drive Logic with AND/OR voting
• Stock & Condition: New Surplus / Tested Refurbished; Physical stock confirmation required; Emergency dispatch subject to order cutoff

The 149986-01 is the Spare 16-Channel Relay Control Module for the Bently Nevada 3500/33. The complete 3500/33 system provides 16 relay outputs, while 149986-01 specifically identifies the control-module spare rather than the separate rear relay-output module 149992-01. The 3500/33 supports programmable alarm logic and can be installed in slots to the right of the TDI.

Module 3: Obsolescence & Supply Chain Deep Dive

When a 3500/33 relay-control assembly fails, the consequence can extend into annunciation, shutdown interlocks, and plant DCS interfaces. The 149986-01 is the control portion of the 3500/33 16-channel relay system, where each relay output can be programmed using Alarm Drive Logic. Inputs to that logic can include Alert, Danger, Not-OK status, and measured variables from one or more monitor channels. For a legacy machinery-protection rack, sourcing the correct control spare can restore the installed relay architecture without replacing functioning monitor modules.

The TCO case favors a matched replacement when the 3500 rack, relay-output hardware, wiring, and existing logic remain suitable. A like-for-like control-module replacement avoids re-engineering shutdown logic and external interlock wiring. There is one important procurement distinction: 149986-01 is the control module; 149992-01 is the separate 16-channel relay output module. Buying the wrong half of the assembly can leave the rack unable to perform the intended relay function even though the replacement physically fits.

Module 4: Compatibility & Replacement Matrix

The published 3500/33 documentation specifies 3500 Rack Configuration Software version 3.3 or later, Data Acquisition Software version 2.40 or later, and Data Display Software version 1.40 or later.

Field Traps — Watch Out

• Control module versus output module: Verify that the purchase is 149986-01, the control-module spare. The corresponding rear output module is 149992-01. These are separate parts.
• Logic/configuration loss: A replacement control module should not be assumed to contain the site’s existing Alarm Drive Logic. Capture the installed configuration before removal and be prepared to reload or verify the approved logic after installation.

Bently Nevada 3500/33 149986-01

Module 5: Quality Assurance & Testing SOP

This is a control and protection component, so pre-shipment QA should verify both hardware integrity and programmable logic behavior.

• Incoming traceability: Record Bently Nevada markings, complete 149986-01 part number, serial number, revision, and date-code information.
• OEM anti-counterfeit visual inspection: Inspect PCB markings, labels, connectors, component population, solder quality, relay-control circuitry, and evidence of unauthorized repair.
• Mechanical inspection: Verify full-height housing, ejector hardware, card-edge connectors, mounting points, and rack interface surfaces.
• Power-on self-test (POST): Install in an approved 3500/33 test rack and verify normal startup and status indications.
• Supply verification: Measure rack power conditions and check for abnormal current draw or excessive temperature rise.
• Module recognition test: Confirm correct identification by the 3500 rack and configuration software.
• Configuration test: Load an approved test configuration and verify Alarm Drive Logic execution.
• Voting-logic test: Exercise representative AND/OR combinations using simulated Alert, Danger, Not-OK, and measured-variable inputs.
• Relay command test: Verify correct control signals to the associated 16-channel relay output assembly.
• I/O load testing: Exercise representative relay-control loads through the complete control/output chain and monitor stability.
• Diagnostic verification: Confirm no persistent module, configuration, or communication faults.
• Software compatibility check: Verify operation with the required 3500 software baseline before release.
• Extended operation: Run repeated logic transitions while monitoring module status and output stability.
• Final QC release: Record part number, revision, software baseline, logic-test results, inspection date, and technician approval.

Module 6: Procurement & Lifecycle FAQ

1. Is the Bently Nevada 3500/33 149986-01 genuinely in stock, and what is the cutoff for emergency shipping?

Current supplier listings show 149986-01 as commercially available, with one current listing reporting in-stock status and an estimated five-business-day shipping window. Actual emergency availability should still be confirmed against physical warehouse stock and the exact revision before PO release.

2. How do you guarantee the condition and authenticity of this surplus relay-control module?

Verification should start with the complete 149986-01 identification, revision, serial information, PCB markings, connectors, and physical condition. Functional QA should then confirm rack recognition, configuration loading, Alarm Drive Logic, relay-control behavior, and representative load performance. Retain photographs and test records with the MRO file.

3. Are there any firmware compatibility issues I should warn my engineers about before issuing the PO?

Yes. The 3500/33 has defined software requirements: Rack Configuration Software 3.3 or later, Data Acquisition Software 2.40 or later, and Data Display Software 1.40 or later. If a 3500/93 LCD display is present, the documentation specifies firmware revision P or later for that display.

4. Can the 149986-01 replace the installed control module without hardware modification?

For an exact 149986-01 replacement in a compatible 3500/33 installation, cabinet modification is normally unnecessary. The critical post-installation task is configuration verification. Also confirm that the installed rear module is the correct 149992-01 output assembly or the appropriate 3500/33 output variant.

5. What warranty and return terms should procurement require?

The PO should specify Bently Nevada 3500/33 149986-01, exact revision, condition, configuration status, test results, warranty period, and return procedure. Warranty coverage should address DOA and verified control-module failure while excluding damage caused by incorrect rack installation, unsuitable power, ESD, configuration errors, external interlock faults, or unauthorized modification.