Provides four relay outputs for machinery protection annunciation, interlock or trip logic.
Technical Summary
3500/32 125712-01 is the main four-channel relay module for the legacy Bently Nevada 3500 rack platform. Its four relay outputs are programmed through Alarm Drive Logic so each relay can respond to selected alarm conditions from monitor channels in the rack.
The 125712-01 front or main module and the separate 125720-01 four-channel relay I/O module are different service items. A correct replacement record therefore includes both labels, the rack slot, field wiring and the saved relay logic.
Specifications
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Exact Model | 3500/32 125712-01 |
| Product Family | 3500 Machinery Protection System |
| Product Type | Four-channel relay main module |
| Relay Outputs | Four independently programmable relay outputs |
| Programming Method | 3500 Rack Configuration Software |
| Logic Function | Alarm Drive Logic using conditions from rack monitor channels |
| Rack Form | Full-height 3500 module |
| Paired I/O Module | 125720-01 Four-Channel Relay I/O Module; separate service item |
| Selection Basis | Exact main-module label, rack slot, I/O module and field wiring |
| Configuration Requirement | Preserve the complete Alarm Drive Logic record before replacement |
Features
Allows each relay channel to use independently configured Alarm Drive Logic.
Collects alarm conditions from the 3500 rack without confusing the main module with the rear I/O assembly.
Supports controlled legacy-rack maintenance when configuration and field circuits are documented together.
Compatibility
- Confirm 125712-01 on the front module and identify the separate 125720-01 I/O module behind the rack.
- Record the exact 3500 rack slot, monitor-channel sources and Alarm Drive Logic before disturbing the module.
- Verify the installed relay loads, external supply, field terminal assignment and contact protection from the site drawings.
- Do not substitute a 3500/32M module solely from the shared 3500/32 name; use the Baker Hughes migration documentation for the installed rack.
Replacement
- Export the rack configuration and print the Alarm Drive Logic for all four relay channels.
- Apply the site trip-bypass and lockout procedure before removing any relay module from a protection rack.
- Photograph the main module, rear I/O module and terminal wiring, then confirm wire tags against the drawings.
- Install the exact module pair and restore configuration under the applicable 3500 maintenance procedure.
- Function-test every relay path through its final field device before all bypasses are cleared.
FAQ
Is 125720-01 included with 3500/32 125712-01?
No. 125712-01 identifies the main four-channel relay module, while 125720-01 identifies the separate relay I/O module; the purchase scope must state which item is required.
What must be backed up before replacing 3500/32 125712-01?
Save the rack configuration, all Alarm Drive Logic equations, source-channel assignments, active bypasses and the current event or diagnostic record.
Can a 3500/32M be inserted directly in place of 3500/32 125712-01?
Do not assume a direct swap. Confirm rack revision, I/O hardware, software support and the documented Baker Hughes migration path.
What site information prevents wiring errors on 3500/32 125712-01?
Provide front and rear labels, rack-slot photos, terminal numbers, relay-load voltage and current, and the interlock or trip drawing for each channel.
How is a replacement 3500/32 125712-01 fully accepted?
Exercise all four programmed logic paths and verify the final annunciator, interlock or trip device while the approved bypass procedure remains in control.
About IndustryParts
https://www.industryparts.com/Relay logic and paired I/O remain traceable
IndustryParts keeps 3500/32 125712-01 tied to its rack position, Alarm Drive Logic and separate relay I/O module record.
- Main module identified
- Logic backup requested
- I/O pairing checked
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