Bently Nevada 149986-02 — Four Relay Outputs with Voting Logic You Program, Not Wire

Series: Bently Nevada 3500/32M  |  Position: Front — relay control module  |  Condition: New |  Warranty: 【12】 months

Logic First, Contacts Second

The 149986-02 is the front control module of the 3500/32M four-channel relay module. It takes Alert, Danger, Not-OK and PPL states from any monitor channel in the rack, combines them through independently programmable AND/OR logic, and commands the four relay outputs — the physical contacts that open a trip valve or sound an annunciator. Because the logic lives in the Rack Configuration Software rather than in wiring, a single module can run simple single-parameter trips, multi-channel voting interlocks, or combinations that would previously have needed several relay cards. It is a full-height module and mounts in any slot to the right of the Rack Interface Module or TDI.

Relay Module Data

Key Features

• Four relay outputs with independent AND/OR voting logic
• Full-height module — any slot right of the RIM/TDI
• Supports 2oo3 voting interlocks without extra hardware
• Hazardous-area and functional-safety rear module option (125720-02)
• API 670 compliant

Compatibility & Related Part Numbers

• 125720-01 4-channel relay output module, internal terminations (rear)
• 125720-02 4-channel relay output module, hazardous area / functional safety systems
• 125712-01 3500/32 front relay module (earlier part number for the same function)
• 149986-01 3500/33 16-channel relay control module (front)
• 149992-01 3500/33 16-channel relay output module (rear)

Part-number caution: the 3500/32M control module spare is listed as 149986-02. The similar-looking 144986-02, which appears on some supplier lists and in some internal spare-parts sheets, does not appear in the official 3500/32M spare list — confirm the number on the module label before ordering.

Typical Applications

Trip and alarm output logic in turbine, compressor and pump protection racks; voting interlocks where a single sensor fault must not trip the machine.

Frequently Asked Questions

1.Q: 3500/32, 3500/32M or 3500/33 — which one do I have?

A: Read the front-card label: 125712-01 is the original 3500/32 relay module, 149986-02 is the 3500/32M control module, and 149986-01 is the 3500/33 16-channel control module. All three drive relay outputs, but the output count and rear modules differ.

2.Q: What is the difference between 125720-01 and 125720-02 rear modules?

A: The 125720-01 is the standard 4-channel relay output module; the 125720-02 is the version for hazardous-area and functional-safety systems.

3.Q: Does this module need a specific software version?

A: Yes — configure it with the 3500 Rack Configuration Software, and confirm the software revision supports the 32M hardware before commissioning.

Why Buy From Us

• Every module functionally tested before dispatch
• 12 months warranty
• In-stock items ship within 3–5 days worldwide
• Engineering support to confirm PWA numbers and rack compatibility before you order — contact us