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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Channels | 4 (programmed in pairs) |
| I/O Type (option 03) | Multimode Prox/Velom I/O Module with Internal Terminations |
| Agency Approval (option 00) | None |
| Input Signals | Proximity, air gap, velocity, acceleration, dynamic pressure |
| Power Consumption | 7.7 W typical |
| Input Impedance | 10 kΩ (Prox/Accel); 3.5 MΩ (Velomitor); 50 kΩ (Multimode positive input) |
| Sensitivity (Hydro RV) | 0.79 / 3.94 / 7.87 mV/µm (20 / 100 / 200 mV/mil) |
| Sensitivity (Hydro Air Gap) | 0.20 / 0.22 / 0.49 / 0.55 mV/µm |
| Sensitivity (Hydro Velocity) | 20 mV/(mm/s) |
| Buffered Outputs | Front-panel coaxial per channel, short-circuit protected, 550 Ω |
| Transducer Power | –23 Vdc nominal @ 43 mA max (Prox/Velom) |
| Recorder Output | 4–20 mA per channel, ±0.25 % accuracy (room temp) |
| Dimensions (Monitor) | 241.3 mm × 24.4 mm × 241.8 mm (9.50 in × 0.96 in × 9.52 in) |
| Weight (Monitor) | 0.91 kg (2.0 lb) |
| Key Features | Multimode (up to 8 independent alarm sets); shear-pin detection via composite NX × gap |
4. Product Introduction
The Bently Nevada 3500/46-03-00 is the 3500/46M Hydro Monitor configured with Multimode Prox/Velom I/O (internal terminations) and no agency approval option. It occupies one full-height front slot plus the matching rear I/O slot in a 3500 rack and is purpose-built for hydraulic turbine-generator sets.
It accepts proximity, seismic, air-gap and dynamic-pressure sensors and conditions them for Hydro Radial Vibration (including shear-pin failure detection), Air Gap (min/max/average and pole location), Velocity, Acceleration, Thrust, Stator End Winding and Dynamic Pressure. Multimode capability stores up to eight complete sets of alert/danger setpoints and time delays that switch automatically with machine operating state (speed, load, direction, etc.). This is the direct replacement for any 3500/46M system ordered as –03-00.
- 350046M-03-00
- 350046M-03-00
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No OK LED / channels Not OK | Missing transducer power or Keyphasor | ✅ High | Measure –23 Vdc at I/O terminals; verify Keyphasor pulses | Confirm probe/cable and Keyphasor wiring first |
| Incorrect air-gap min/max or pole number | Pole-passing rate outside 1–200 poles/s or gap zero error | ✅ High | Check rotor speed and gap voltage at buffered output | Verify probe gap and pole count configuration |
| Shear-pin (composite NX) alarm false or missing | Gap zero position or NX filter setting wrong | ✅ High | Review zero-gap calibration and NX selection in software | Re-zero gap and confirm N value (2–50) |
| Multimode alarms not switching | Mode contact or software command missing | ❌ Low (monitor side) | Monitor discrete mode inputs or gateway commands | Verify multimode I/O wiring or communication path |
| High velocity readings on low-speed unit | Wrong filter mode (Low vs High) | ✅ Medium | Confirm Low Mode (0.1875–343.75 Hz) for <100 RPM machines | Select correct velocity filter mode |
| Intermittent communication after swap | Backplane contact or firmware mismatch | ✅ Medium | Reseat module; read diagnostic buffer | Always power down or remove associated I/O before reseating |
If symptoms persist, capture front-panel LED status, a full diagnostic log from the 3500 Rack Configuration Software, and photos of the I/O module face, then contact technical support.
6. Frequently Asked Questions (FAQ)
Q: Is the 3500/46-03-00 a complete monitor or just the front card? A: It is the ordered configuration of the 3500/46M front monitor plus the Multimode Prox/Velom I/O module with internal terminations. Both the front and rear cards are required.
Q: Can this module be used on standard industrial turbines? A: No. It is purpose-built for hydro turbine-generators with low-speed frequency response, air-gap, shear-pin and multimode features. Use a 3500/42M for conventional machines.
Q: Does it support hot-swap? A: The monitor can usually be removed and inserted with the rack powered, but always follow plant lockout procedures and the specific I/O module guidelines.
Q: Why is the price lower than a factory-new unit from Baker Hughes? A: This is New Original / New Surplus stock—genuine Bently Nevada parts that have never been installed in a running system. Units ship with a 1-year warranty after functional verification.
Q: Will my existing configuration file work after replacement? A: Yes, provided the channel types, multimode sets and Keyphasor assignments match. Always back up the current configuration and note the exact firmware revision before swapping.
Q: What is the difference between option 03 and the other I/O options? A: Option 03 is Multimode Prox/Velom with internal terminations. Options 01/02 are non-multimode Prox/Velom; 05/06 are Multimode Positive Input I/O variants.
Q: What is the typical lead time and warranty? A: Units are normally in stock for same- or next-day shipment. All modules carry a 1-year warranty against defects in materials and workmanship.
