Description
Bently‑Nevada 126648‑01 Keyphasor I/O Daughter Board（External Termination）
Product Overview
126648‑01 is the non‑isolated external‑termination I/O daughter‑card for 3500/25 Enhanced Keyphasor module, mates with main logic board 149369‑01 to constitute a complete 3500/25 module assemblyBaker Hugh…. Field sensor wiring connects to external termination block (not onboard terminal). It processes proximity probe / magnetic pickup once‑per‑turn pulse signals, supplies speed and phase reference for 3500 rack vibration monitor modules. Original production discontinued, available only as aftermarket spare for legacy turbine & compressor TSI racks。
126648‑01
Key Specifications
| Item | Parameter |
|---|---|
| Part Number | 126648‑01 (Keyphasor I/O Board, External Termination, Non‑Isolated)Baker Hugh… |
| Manufacturer | Bently‑Nevada (Baker Hughes) |
| Module Assembly | Complete 3500/25 = Main board 149369‑01 + I/O daughter‑card 126648‑01 |
| Channels | 2‑channel Keyphasor input |
| Sensor Types | Proximity probe, magnetic pickup(MPU) |
| Transducer Power | ‑24 VDC, max 40 mA per channel |
| Speed Range | 1 rpm ~ 25 000 rpm |
| Trigger Threshold | Configurable 0.5 V‑2.5 V peak‑peak |
| Termination Mode | External termination, field wires to separate external terminal block, no rear onboard Euro‑terminal |
| Buffered Output | Front‑panel BNC ×2; rear buffered signal, max output impedance 504 Ω |
| Power Consumption | 3.2 W typical (whole 3500/25 assembly) |
| Operating Temperature | ‑30 °C ~ +65 °C |
| Storage Temperature | ‑40 °C ~ +85 °C |
| Humidity | 5‑95 % RH non‑condensing |
| Weight(I/O board) | 0.38 kg |
| Status | Discontinued OEM production, aftermarket spare‑part only |
Important version comparison for 3500/25 I/O boardsBaker Hugh… |PN|Isolation|Termination style| |—|—|—| |126648‑01|Non‑isolated|External termination| |126648‑02|Isolated|External termination| |135473‑01|Isolated|Internal onboard Euro‑terminal|
Main Applications
- Steam / gas turbine, centrifugal compressor 3500 machinery‑protection racks
- Power‑plant, petrochemical refinery rotating‑machinery condition monitoring
- Shaft speed measurement, 1X‑amplitude & phase calculation, rotor balancing, vector fault diagnosis
- Cooperates with System‑1 software for vibration post‑trip analysis
- Spare‑part replacement for existing 3500 racks using external‑termination wiring scheme
126648‑01
Related Series Models
- 126648‑01 Non‑isolated external‑termination I/O daughter‑card
- 149369‑01 3500/25 main logic CPU board
- 126648‑02 Isolated external‑termination I/O board
- 135473‑01 Isolated internal‑termination I/O board
- 125792‑01 Old‑generation complete non‑isolated 3500/25 assembly
- 3500/40M Proximity / vibration monitor module consuming Keyphasor timing signal
Core Features
- External termination architecture: Field sensor wiring routed to separate external terminal block, suitable for cabinet pre‑wiring layout; no wiring terminals on module rear edge.
- Dual‑channel pulse signal conditioning: Accept both proximity probe and passive magnetic‑pickup signals; adjustable trigger‑threshold & hysteresis suppress field electrical noise.
- Front‑panel BNC buffered outputs: Convenient access for portable vibration analyser during on‑site balancing and troubleshooting.
- Full diagnostics: Detects transducer open‑circuit / short‑circuit and internal hardware faults; reports alarm status via rack RIM and front‑panel LED indicators.
- Half‑height hot‑swap compatible: Matches standard 3500 rack slot; backward‑compatible with existing 3500 firmware.
Main Functions
- Receive raw pulse signals from shaft key‑phasor proximity probes / magnetic pickups, complete signal conditioning and threshold triggering.
- Transmit conditioned timing signals to main logic board 149369‑01 for once‑per‑turn reference generation and shaft‑speed computation.
- Distribute timing reference over rack backplane for vibration‑monitor modules to calculate 1X vibration amplitude and phase angle.
- Provide buffered Keyphasor pulses for external diagnostic instruments via front‑BNC and rear‑side signal path.
- Continuously monitor transducer and board health, upload fault‑diagnostic data to RIM and host monitoring software.
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