Bently 3500-50 133388-02 Tachometer 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: 2‑Channel Tachometer / Speed Monitor Module ‑ Channel quantity: 2 independent pulse input channels ‑ Supported transducers: 3300XL proximity probes, magnetic pick‑up sensors ‑ Probe excitation power:‑24 VDC supplied by module ‑ Input signal range:+10 V ~ ‑24 V ‑ Input impedance:20 kΩ standard ‑ Measuring range:0.1 ~ 99999 RPM ‑ Measurement accuracy:＜100 RPM: ±0.1 RPM; 100‑10000 RPM: ±1 RPM; ＞10000 RPM: ±0.1 % reading ‑ Max input frequency:20 kHz ‑ Typical power consumption:5.8 W, powered by rack backplane busBaker Hugh… ‑ Front‑panel Indicators: OK LED, TX/RX LED, Bypass LED ‑ Matching Parts: Main‑board 133388‑02 must pair with rear I/O board 133396‑01, sold separately ‑ Hot‑swap: Supports hot‑swap; during replacement, two‑channel speed measurement is temporarily invalid; 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 0.80 kg

Core Functions

1. Pulse‑signal conditioning: Supply‑24 VDC for proximity probes; condition magnetic pick‑up pulse signals for speed acquisition.
2. Multi‑mode speed monitoring: Rotational‑speed measurement, acceleration / deceleration rate calculation, zero‑speed detection, reverse‑rotation detection.
3. Flexible alarm configuration: Speed set‑point alarm, speed‑band alarm, zero‑speed alarm, reverse‑rotation alarm; Alert / Danger with configurable delay.
4. Analog output: Each channel provides isolated 4‑20 mA output via rear I/O board for DCS speed display and data acquisition.
5. Speed reference source: Provides rack‑wide speed value for other monitor modules.
6. Self‑diagnosis: Continuous transducer cable fault detection, report module hardware fault to rack system log.

Installation, Replacement & Critical Warnings

1. Supports hot‑swap; two‑channel speed measurement loses effectiveness during pulling‑out; other rack modules keep running.
2. Compatibility warning: ‑ Cannot drop‑in replace old non‑M‑series tachometer boards; must use matched rear‑I/O board 133396‑01, verify rack firmware version. ‑ Magnetic pick‑up sensors are not recommended for zero‑speed and reverse‑rotation monitoring under low‑speed condition, easy to produce false signal. ‑ For overspeed protection trip application, use dedicated 3500/53 overspeed module, do not rely on 3500/50 for protection trip.
3. After replacement, check OK and Bypass LED status; download rack configuration project, verify speed reading, zero‑speed / reverse‑rotation function and 4‑20 mA output.

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