Bently 3500-44 140734-03 Aeroderivative Gas‑Turbine Vibration Monitor Main Board

Description

Hardware & Electrical Specifications

‑ Manufacturer: Bently Nevada (Baker Hughes) ‑ Compatible System: 3500‑05 full‑size / mini TSI rack, cooperates with 3500/22M TDI module, requires M‑series system firmware ‑ Functional Type: 4‑Channel Aeroderivative Gas‑Turbine Dedicated Vibration Monitor ‑ Channel quantity: 4 independent multi‑functional input channels ‑ Supported transducers: 3300XL proximity probes, Velomitor velocity sensors, accelerometers ‑ Probe excitation power:‑24 VDC supplied by module ‑ Programmable sensitivity:  Proximity:100 mV/mil (3.94 mV/μm), 200 mV/mil (7.87 mV/μm)  Acceleration:100 mV/g  Velocity:20 mV/(mm/s) pk ‑ Frequency response:0.5 Hz ~ 15 kHz (‑3 dB) ‑ Measurement accuracy:max ±1 % full‑scale ‑ Typical power consumption:7.7 W, powered by rack backplane bus ‑ Front‑panel: Four BNC buffered transducer output connectors; status LED: OK, TX/RX, per‑channel fault indicators ‑ Matching Parts: Main‑board 140734‑03 must pair with corresponding dedicated rear I/O board (multiple variants for different sensor combinations, sold separately) ‑ Hot‑swap: Supports hot‑swap; during replacement, four channels of this module lose measurement & protection; other rack modules keep running normally. ‑ PCB Coating: Conformal coated for G3 harsh industrial cabinet environment ‑ Safety Certification: SIL‑2 capable within complete certified 3500 system set; ATEX / UL hazardous‑area approvals available.

Environmental Specifications

‑ Operating Temperature:‑30 °C ~ +65 °C ‑ Storage Temperature:‑40 °C ~ +85 °C ‑ Relative Humidity:5%‑95 % non‑condensing ‑ Vibration & Shock: Complies with API‑670 power‑plant cabinet EMC standards

Mechanical Data

‑ Dimension(W×H×D):25.4 mm ×120.7 mm ×251.5 mm ‑ Weight: approx 0.92 kg

Core Functions

1. Multi‑sensor signal conditioning: Supply‑24 VDC for proximity probes; condition Velomitor velocity and accelerometer signals, specially optimized for high‑speed aero‑derivative gas‑turbine characteristics.
2. Multi‑mode alarm set‑point switching: Up to 8 groups of Alert/Danger alarm parameters, automatic switch according to machine operating state (start‑up, load, coast‑down) to avoid false alarm.
3. Dual Keyphasor support: Two independent Keyphasor timing inputs; each channel pair can select different Keyphasor source for phase‑angle calculation and 1X tracking filter.
4. Advanced filter function: Software configurable band‑pass filter, signal integration, 1X tracking filter for complex gas‑turbine vibration analysis.
5. Two‑level alarm processing: Alert and Danger setpoints with configurable delay; generate rack system events, trigger relay‑module hardware alarm/trip output.
6. Analog output: Each channel provides isolated 4‑20 mA output via rear I/O board for DCS data acquisition.
7. Buffered BNC outputs: Front‑panel short‑circuit‑protected BNC copies raw transducer signal for portable field diagnostic instrument connection.

Installation, Replacement & Critical Warnings

1. Supports hot‑swap; the four channels of this module lose measurement & protection during pulling‑out; other rack modules keep running.
2. Compatibility warning: ‑ Cannot drop‑in replace 3500/40M‑140734‑01 or 3500/42M‑140734‑02. Dedicated rear I/O boards must be used; cross‑replacement requires changing rear terminal board and verifying rack firmware version. ‑ Multiple rear I/O board variants for 140734‑03; select correct I/O part‑number according to on‑site sensor type. ‑ TMR triple‑redundant rack requires three identical 140734‑03 modules for three‑way redundant measurement.
3. After replacement, check OK and channel LED status; download rack configuration project, verify vibration reading, multi‑mode alarm switching function and 4‑20 mA output.

4. Common failure mode:‑24 VDC transducer power circuit damage, BNC buffer‑circuit surge damage, component aging; transducer cable short‑circuit may burn front‑end conditioning circuit.