Description
The Bently Nevada 3300/14-01-20-00 is a dedicated chassis power supply for legacy 3300-series rotating machinery protection racks. It converts wide-range site DC power into multi-rail regulated voltages for all rack monitor cards and 3300 XL eddy-current proximity transducers, deployed on steam turbines, gas turbines, centrifugal compressors, and large generators.
Full Part Number Decode (3300/14-A-B-C Format)
- 3300 = Legacy machinery monitoring rack platform
- /14 = Module family: DC-input rack power supply
- -01 = Input voltage class: 20 V DC to 34 V DC wide DC input
- -20 = Power Input Module (PIM): Standard non-intrinsically safe design, no internal explosion-proof barriers
- -00 = Agency certification option: No hazardous area approvals (general electrical room use only)
Core Technical Specifications
| Parameter | Measured / OEM Rated Value |
|---|---|
| Full Part Number | 3300/14-01-20-00 |
| OEM Base Assembly PN | 85515-02 Rev A |
| Manufacturer | Bently Nevada (Baker Hughes), USA assembled |
| Primary DC Input Range | 20 V DC – 34 V DC |
| Max Continuous Input Draw | 5.5 A; input fuse rating 8 A |
| Max Supported Rack Load | Up to 12 monitor modules per rack |
| Transducer Aux Rail (Jumper Selectable) | -18 V DC or -24 V DC for proximity probes |
| Internal Logic Rails | Multiple tightly regulated DC buses for backplane monitor cards |
| Fault Relay Output | SPDT hermetic relay; 5 A @ 120 V AC / 5 A @ 28 V DC |
| Built-In Protections | Reverse polarity fuse lockout, overvoltage shutdown, undervoltage lockout, short-circuit auto-recovery, thermal overcurrent cutback |
| Operating Ambient Temp | 0 °C to 60 °C (rack enclosure) |
| Storage Temperature | −40 °C to +85 °C |
| Mandatory Mount Slot | Slot 1 (far left position) of all 3300 6/10/14-slot racks |
| Physical Dimensions | 330 mm × 205 mm × 52 mm |
| Net Weight | 2.04 kg |
| Certifications | CE, cULus general industrial listing; no ATEX / Class Div hazardous area ratings |
| Platform Lifecycle Status | OEM discontinued production after 2014; official factory repair depots closed in 2017 |
Functional Description
This module takes 20–34 V DC plant battery/DC UPS supply and generates two critical power domains: regulated internal bus power for all rack monitor cards, and adjustable negative bias voltage for 3300 XL proximity probes and keyphasor transducers.
A front-panel status LED indicates global rack power health. The isolated SPDT OK relay hardwires to plant DCS or safety trip logic; the relay de-energizes if internal regulation drifts outside factory tolerance thresholds. Integrated EMI filtering suppresses ground-loop noise common in turbine and compressor electrical rooms.
An internal two-position jumper selects -18 V DC or -24 V DC transducer bias without hardware replacement. If input DC falls below 18 V DC or rises above 36 V DC, the unit fully shuts down; automatic restart occurs once input returns to rated operating range with no manual reset required.
Parallel redundant dual power supply operation is not factory supported. Each 3300 rack requires exactly one 3300/14 unit installed in Slot 1.
Compatibility Matrix
- Valid Rack Chassis: All 3300-series 6-slot, 10-slot, 14-slot machinery protection racks with PN 79624-01 series backplanes
- Monitor Card Compatibility: Fully interoperable with all 3300-series monitor modules (3300/16 vibration, 3300/20 thrust position, 3300/36 dual temperature, 3300/03 system display)
- Platform Cross-Compatibility: Zero hardware or backplane pinout match with modern 3500-series monitor racks
- Input Variant Distinction: -01 = 20–34 V DC low DC input; -02 suffix = 90–140 V DC high-voltage DC input (non-interchangeable)
- Transducer Compatibility: Natively powers standard 3300 XL proximity probe systems; third-party sensors require external signal isolation barriers
- AC Power Supply Cross-Check: Cannot substitute with 3300/12 AC mains power supply; backplane pin assignments differ and direct swap causes permanent card damage
Condition, Stock & Lead Time
- Available Unit Conditions: New Surplus (factory sealed unused OEM stock), Certified Refurbished (full bench load testing), Used Pull (limited coverage)
- Typical Global Surplus Inventory: 4–16 certified test units across industrial spare parts vendors
- Refurbished Bench Test Scope: 20–34 V DC full input voltage sweep, transducer rail regulation calibration, OK relay continuity test, full 12-card rack load simulation, thermal soak cycling, backplane bus communication validation
- North American Domestic Lead Time: 2–4 business days ground shipping; 1 business day expedited air freight
- International Lead Time: 7–14 business days via DHL/FedEx express
- Standard Warranty Terms: 12-month replacement warranty for new surplus stock; 9-month warranty for certified refurbished units
Pricing Guidance
Global reseller indicative pricing ranges 1,050–1,900 USD per unit, with tiered volume discounts for orders of 3+ modules.Price subject to surplus inventory availability, regional import tariffs, and included calibration documentation; contact supplier for a firm binding quote.
Industrial Application Notes
- The module does not support hot-swapping. Full rack primary DC power shutdown is mandatory before removal or installation to avoid backplane bus corruption and monitor card damage.
- Set internal jumper to -24 V DC for standard 5 mm / 8 mm 3300 XL proximity probes; use -18 V DC only for legacy short-range older probe models.
- Install external input-side surge suppression for unfiltered outdoor DC power feeds to extend internal electrolytic capacitor service life.
- Avoid sustained rack ambient temperatures above 55 °C. Continuous high heat reduces capacitor lifespan; field data shows service life drops to 4–6 years under constant elevated temperature.
- This -00 suffix variant excludes intrinsic safety barriers. Deploy only in non-hazardous general electrical rooms. Hazardous Class I Div 1/2 installations require alternate 3300/14 part numbers with ATEX safety suffixes.
Frequently Asked Questions
Q: Can this power supply drive a 3300 rack populated with more than 12 monitor cards?A: No. Internal power rail design enforces a hard 12-monitor maximum load. Overloading triggers thermal cutback and persistent OK relay fault alarms.
Q: Can two 3300/14 units be wired in parallel for redundant rack power?A: The hardware lacks built-in current-sharing control circuitry. Parallel dual power supply configuration is unsupported and generates cross-feed voltage transients that permanently damage rack monitor cards during fault events.
Q: Is factory OEM repair service still available for this obsolete power supply?A: Baker Hughes closed all official 3300 repair depots in 2017. All replacement hardware and refurbishment must be sourced from third-party industrial surplus vendors.
Q: What fault action occurs if the transducer bias rail fails?A: The OK relay de-energizes and triggers site alarm/trip logic; monitor cards detect missing probe bias and flag transducer open-circuit faults on the front-panel LEDs of connected monitor modules.
