Bently Nevada 13677-01 3300 Series Keyphasor Power Supply Module

Description

Product Introduction

The Bently Nevada 13677-01 is an essential internal power supply card designed for the legacy 3300 Series Machinery Protection System—specifically integrated with the 3300/65 Keyphasor Monitor assembly. In rotating machinery diagnostics, the Keyphasor reference signal provides phase-angle information (1-Event-Per-Revolution) critical for calculating vibration phase angles, tracking shaft speed, and triggering vector filtering.

The 13677-01 board draws primary power from the main 3300 rack backplane bus and regulates it into a stable, noise-isolated -24V DC power rail dedicated to powering optical or eddy-current Keyphasor proximity transducers (such as 3300 XL Proximitor sensors). This isolation prevents electrical noise from field sensors from bleeding back into the main rack processing modules.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

A steam turbine generator set at a power generation plant experiences intermittent “Keyphasor Fault” alarms on its 3300 monitoring rack during startup. Without a valid 1-Event-Per-Revolution phase pulse, the plant SCADA and diagnostic software cannot calculate 1X and 2X filtered vibration vectors, leaving the turbine running without phase tracking during critical thermal ramp-up. Troubleshooting reveals the -24V DC supply to the Keyphasor Proximitor has drifted or dropped under load due to an aging power supply card. Swapping out the faulty 13677-01 power supply board inside the 3300/65 module restores clean, regulated -24V DC to the field sensor, immediately clearing the fault and re-establishing phase-angle lock.

• Turbine-Generator Sets: Delivers continuous power to Keyphasor sensors for shaft speed and vibration phase-angle measurement.
• High-Speed Boiler Feed Pumps: Powers proximity probes monitoring shaft notch/keyway timing events.
• Centrifugal Air & Gas Compressors: Ensures reliable phase reference signals for machinery diagnostic instrumentation and orbit plots.
• Legacy Plant Upgrades & Maintenance: Essential replacement part for maintaining active Bently Nevada 3300 protection racks in service.

13677-01

13677-01

Transparency SOP: Quality Assurance & Testing

1. Visual & Structural Inspection: Printed circuit board traces, solder joints, edge connector fingers, and discrete power components are inspected for thermal discoloration, micro-cracks, or capacitor leakage.
2. Backplane Power-Up Test: The 13677-01 board is installed in a live Bently Nevada 3300 test rack to verify backplane power engagement and primary voltage regulation.
3. Load Calibration & Regulation Test:
   • Voltage Output Verification: Measured under simulated transducer loads (0 to 50 mA) to confirm output voltage stays strictly within the -24V DC ± 0.5V specification.
   • Ripple & Noise Audit: Output rail is checked on an oscilloscope to ensure low peak-to-peak AC ripple, guaranteeing noise-free Keyphasor pulse triggering.
4. Thermal Stability Test: Powered continuously under load for 2 hours to confirm thermal stability of voltage regulators and current-limiting components.
5. Final ESD Packaging: Cleaned, coated with protective film on connector edge, wrapped in static-shielding bags, and packaged in custom-foam boxes.

The Veteran’s Tech Trap Guide (Crucial Value-Add)

• ⚠️ Not a Standalone Power Supply: The 13677-01 is an internal sub-module card for the 3300 system (primarily inside or behind the 3300/65 Keyphasor monitor), NOT the main 3300 rack power supply (such as the 3300/12 or 3300/14). Do not attempt to wire 120/240V AC line power directly to this board.
• ❗ Field Wiring Short Circuit Checks: Before installing a new 13677-01 board, verify field wiring between the 3300 rack terminal block and the Keyphasor Proximitor sensor for shorts between -24V and COM/Ground. A hard short in field conduit can instantly overload or damage new power supply components.
• ⚠️ Verify Keyphasor Probe Gap: If the Keyphasor pulse remains erratic after replacing the 13677-01 card, check the physical gap of the proximity probe facing the shaft notch/keyway. A gap that is too wide (voltage outside -6 to -14 VDC baseline) will fail to generate a sufficient voltage transition pulse regardless of power supply health.
• ❗ Legacy System Compatibility Note: The 3300 series is legacy/discontinued by Bently Nevada. Ensure your spare inventory consists of original 13677-01 boards tested under load, as mismatched board revisions can cause crosstalk on the 3300 backplane bus.

Frequently Asked Questions (FAQ)

Q: What is the primary role of the 13677-01 card in a Bently Nevada 3300 rack?

A: It provides regulated -24V DC power specifically designated for Keyphasor proximity transducers and signal conditioning circuits associated with the 3300/65 Keyphasor monitor module.

Q: Can I use the 13677-01 board in the newer Bently Nevada 3500 system?

A: No. The 13677-01 is designed strictly for the 3300 Series rack backplane architecture. The 3500 system uses a completely different architecture (3500/25 or 3500/22M Keyphasor modules).

Q: Is the 13677-01 still manufactured by Bently Nevada?

A: Bently Nevada has retired the 3300 Series. The 13677-01 is available as New Surplus or fully tested/reconditioned stock to keep existing 3300 protection systems running reliably without expensive total-rack migrations.

Q: What happens if the 13677-01 board fails?

A: The Keyphasor monitor will report a channel fault / supply failure. While overall radial vibration amplitude monitoring continues, phase-angle calculations, 1X/2X tracking, and shaft orbit analysis will become unavailable in your diagnostic software.

Q: What warranty is supplied on surplus or reconditioned 13677-01 cards?

A: All New Surplus and fully reconditioned Bently Nevada 13677-01 boards come with a full 12-month replacement warranty from the invoice date.