Provides two Keyphasor input channels for phase-reference and rotational-speed event signals.
Key Information
125800-01 is the Bently Nevada 3500/25 Keyphasor I/O Module with internal terminations. It forms the field-connection half of the Enhanced Keyphasor module set.
The I/O module is paired with the compatible 3500/25 main module, commonly identified as 149369-01. The -01 execution is non-isolated; it must not be confused with the isolated 125800-02 execution used when isolation is required.
Functions
Accepts field wiring through internal terminations in the 3500 rack arrangement.
Works with the Enhanced Keyphasor main module to produce phase references used by machinery monitoring channels.
Maintains the non-isolated input boundary defined by the 125800-01 execution.
Specifications
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| System family | 3500 Machinery Protection System |
| Module role | 3500/25 Keyphasor I/O module |
| Termination style | Internal terminations |
| Input isolation | Non-isolated |
| Channel capacity | Two Keyphasor input channels |
| Compatible main module | 3500/25 Enhanced Keyphasor main module, 149369-01 |
| Input signal range | +0.8 to -21.0 V for non-isolated input |
| Transducer power | -24 V DC, 40 mA maximum per channel |
Installation
- Confirm that the rack plan calls for non-isolated internal terminations before selecting 125800-01.
- Record the paired main-module part number, rack slot and both input channel assignments before disturbing wiring.
- Maintain shield, common and transducer-power practices from the 3500 installation documentation.
- Verify phase mark, speed indication and alarm-channel use after installation before returning protection logic to service.
Lifecycle
- Preserve the 125800-01 suffix because 125800-02 has a different isolation boundary.
- Keep the rack configuration backup and channel map with the replacement record.
- Inspect internal terminal hardware and mating connectors before accepting a stored or repaired module.
About IndustryParts
https://www.industryparts.com/Termination and isolation details remain visible
IndustryParts prepares 125800-01 with the I/O suffix, paired main card and channel purpose clearly stated for rack maintenance.
- -01 execution preserved
- Companion card identified
- Channel map reviewed
FAQ
What is the key procurement difference between 125800-01 and 125800-02?
125800-01 is the non-isolated internal-termination I/O module. The -02 execution provides isolated inputs and is selected for a different field-signal requirement.
Does 125800-01 operate as a complete Keyphasor module by itself?
No. It is the I/O half of the 3500/25 set and must be paired with the compatible Enhanced Keyphasor main module and rack configuration.
What should be recorded before replacing 125800-01?
Capture rack slot, paired main-module part number, channel wiring, transducer type, phase mark orientation, speed range and the current 3500 configuration backup.
Can magnetic pickups be connected to 125800-01?
The non-isolated execution is not a blanket replacement for isolated magnetic-pickup applications. Confirm the transducer and isolation requirement in the 3500 design record.
What acceptance test is useful for 125800-01?
Verify exact identity, terminals, connector condition and channel continuity, then confirm live Keyphasor pulse quality and phase behavior under the approved machine test plan.
