Bently 3500-45 176449-04 Position 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 Multi‑Sensor Position Monitor ‑ Channel quantity: 4 independent input channels ‑ Supported transducers: 3300XL proximity probes, RPT, DC‑LVDT, AC‑LVDT, rotary potentiometersBaker Hugh… ‑ 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)  LVDT / potentiometer multiple sensitivity options configurable by software ‑ Frequency response: DC ~ 5 kHz (‑3 dB) ‑ Measurement accuracy: typical ±0.33 % FS, 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 176449‑04 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 0.91 kg

Core Functions

1. Multi‑position‑sensor signal conditioning: Supply‑24 VDC for proximity probes; condition RPT, DC‑LVDT, AC‑LVDT and potentiometer signals.
2. Multi‑mode displacement measurement: Channel‑pair configurable for thrust axial position, differential expansion (single‑ramp / dual‑ramp / complementary), case expansion, valve position.
3. Two‑level alarm processing: Alert and Danger setpoints with configurable delay; generate rack system events, trigger relay‑module hardware alarm/trip output.
4. Analog output: Each channel provides isolated 4‑20 mA output via rear I/O board for DCS data acquisition.
5. Buffered BNC outputs: Front‑panel short‑circuit‑protected BNC copies raw transducer signal for portable field diagnostic instrument connection.
6. Self‑diagnosis: Continuous transducer cable fault detection, report module hardware fault to rack system log.

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 / 3500/42M. 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 176449‑04; select correct I/O part‑number according to on‑site sensor type (proximity / LVDT / potentiometer). ‑ TMR triple‑redundant rack requires three identical 176449‑04 modules for three‑way redundant position measurement.
3. After replacement, check OK and channel LED status; download rack configuration project, verify position reading, alarm threshold and 4‑20 mA output function.

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.