Description
The 3500/15-04-04-00 is a dual-slot Legacy Low Voltage DC Power Supply Module manufactured by Bently Nevada (Baker Hughes) for the 3500 Series Machinery Protection System rack, delivering regulated DC voltages to all modules on the backplane from a 20–30 VDC field power source. The “-04-04” suffix in the model designates two identical Legacy Low Voltage DC supplies installed simultaneously — one in the top slot acting as primary and one in the bottom slot acting as backup — while the “-00” suffix indicates the standard non-hazardous-area agency approval option.
As a half-height module occupying two dedicated slots on the left side of the 3500 rack, the 3500/15-04-04-00 accepts a wide DC input window and converts it to the regulated rail voltages consumed by the rack’s vibration, speed, position, and communication monitors, with either supply capable of powering the full rack on its own.
Application Scenarios
Consider an offshore production platform where a gas-turbine-driven compressor train is protected by a Bently Nevada 3500 rack installed in an uncontrolled equipment room. The platform’s DC distribution system runs on a 24 VDC station battery — a holdover from the original control system design — and the rotating-equipment engineering standard requires that loss of any single power feed, fuse, or supply module shall not interrupt machinery protection, because the rack carries overspeed and axial-position alarms that feed directly into the emergency shutdown logic.
This is the precise operational context for the 3500/15-04-04-00. The two half-height slots on the rack’s left side are populated with identical Legacy Low Voltage DC supplies, each fed from a separate 24 VDC distribution source. Under normal operation, the lower supply acts as primary and carries the rack load; should that feed drop out, the upper supply picks up the full rack load without interruption — a transition the datasheet explicitly confirms as non-disruptive when both supplies are installed. Because the module is hot-swappable in a redundant configuration, a faulty supply can be removed and replaced during operation without dropping protection on the turbine. The pain point the 3500/15-04-04-00 resolves is deceptively simple but mission-critical: it converts an unreliable single-feed DC distribution architecture into a fault-tolerant power backbone for the machinery protection rack, with no additional enclosure, no external UPS, and no change to the validated protection logic.
Parameter
The following table consolidates verified electrical, mechanical, and functional parameters for the 3500/15-04-04-00 drawn from the official Bently Nevada datasheet (Document 141530, Rev. P) and authorised distributor documentation.
| Main Parameters | Value / Description |
|---|---|
| Product Model | 3500/15-04-04-00 |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Product Category | Legacy Low Voltage DC Power Supply Module (Dual / Redundant) |
| Host Platform | Bently Nevada 3500 Series Machinery Protection Rack |
| Power Supply Type (Top Slot) | 04 = Legacy Low Voltage DC |
| Power Supply Type (Bottom Slot) | 04 = Legacy Low Voltage DC (redundant / backup) |
| Agency Approval Option | 00 = None (standard, non-hazardous area) |
| Input Voltage Range | 20 to 30 VDC (24 VDC nominal — standard 24 VDC control power) |
| Full Rack Current Draw | 11.0 A maximum (Low Voltage DC option) |
| Out-of-Range Protection | Undervoltage: no harm to supply or PIM; Overvoltage: fuse opens on PIM |
| Front-Panel Indication | Supply OK LED (illuminates when supply is operating properly) |
| Power Supply Dimensions (H × W × D) | 120.7 × 50.8 × 251.5 mm (4.75 × 2.0 × 9.9 in) |
| Power Supply Weight | 1.39 kg (3.06 lb) |
| Power Input Module (PIM) Dimensions | 120.7 × 25.4 × 114.3 mm; weight 0.34 kg (0.75 lb) |
| Associated PIM Part Numbers | 133292-01 (Legacy LVDC Power Supply Module), 133300-01 (Legacy LVDC PIM) |
| Replacement Fuse | 01720045 (for Legacy LVDC Power Input Module) |
| Rack Space | Two half-height slots on the left side of the rack (one per supply) |
| Hot-Swappable | Yes, when the redundant second supply is installed |
| Operating Temperature | −30 °C to +65 °C (−22 °F to +150 °F) |
| Storage Temperature | −40 °C to +85 °C (−40 °F to +185 °F) |
| Relative Humidity | 95 %, non-condensing |
| Compliance | FCC Part 15; EMC Directive 2014/30/EU (EN 61000-6-2, EN 61000-6-4); LV Directive 2014/35/EU (EN 61010-1); RoHS 2011/65/EU; DNV GL & ABS maritime rules |
