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Brand: Bently Nevada
3500/15 AC/DC Power Supply Module
Description
Overview
The Bently Nevada 3500/15 is the AC/DC power supply module for the 3500 series continuous machinery protection rack, providing the regulated power the rack’s monitor and relay modules depend on for uninterrupted vibration and condition monitoring. Offered in universal AC, high-voltage DC, and low-voltage DC input variants, it lets an installation match the power supply to whatever site electrical supply is available.
As a core infrastructure module in the widely deployed Bently Nevada 3500 machinery protection platform, the 3500/15 is engineered for continuous, high-availability operation in critical turbomachinery protection systems. Seven Star LLC supplies the Bently Nevada 3500/15 power supply module on request to power generation, oil and gas, and process facilities across Oman and the GCC.
Operating Principle
The 3500/15 converts the site’s available AC or DC supply into the regulated power the 3500 rack’s monitor and relay modules require, with a front-panel Supply OK LED giving an immediate visual health indication. When two power supplies are installed in a rack, the module in the lower slot acts as primary and the module in the upper slot as backup, with either supply removable or insertable without disrupting rack operation — critical for maintaining continuous machinery protection during maintenance.
Engineering Design of the Bently Nevada 3500/15
Three input variants are available: universal AC (110–220VAC nominal, 85–264VAC operating range in non-hazardous areas or 85–250VAC in hazardous areas, 47–63Hz) drawing up to 2.8A rms full-rack current; high-voltage DC (88–140VDC) drawing up to 2.5A; and low-voltage DC (20–30VDC) drawing up to 11.0A. The power supply module measures 120.7mm (H) × 50.8mm (W) × 251.5mm (D) and weighs 1.39kg, with a separate power input module (120.7mm × 25.4mm × 114.3mm, 0.34kg) installing directly behind it as a half-height module on the left side of the rack.
Key Features
- Universal AC, high-voltage DC, or low-voltage DC input variants
- 1:1 primary/backup redundancy when two supplies installed
- No rack disruption on removal or insertion when a second supply is installed
- Front-panel Supply OK LED
- Up to 11.0A input current at full rack load on the low-voltage DC variant
- Half-height module, left-side rack mounting
- Designed for continuous, high-availability machinery protection
- Compatible with the full Bently Nevada 3500 rack platform
Industrial Applications
The 3500/15 is used to power Bently Nevada 3500 machinery protection racks monitoring critical turbines, compressors, pumps, and generators across power generation, oil and gas, and petrochemical facilities in Muscat, Sohar, and Salalah, where continuous vibration and position monitoring is a safety and reliability requirement.
Across the GCC’s power and process industries, the 3500/15’s redundant dual-supply capability directly supports the high-availability requirements of critical machinery protection systems, where a power supply failure must never interrupt the continuous monitoring that trips a machine before a vibration or thrust-related failure causes catastrophic damage.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | Bently Nevada 3500/15 |
| Universal AC Input | 85–264VAC, 47–63Hz, up to 2.8A rms |
| High-Voltage DC Input | 88–140VDC, up to 2.5A |
| Low-Voltage DC Input | 20–30VDC, up to 11.0A |
| Redundancy | 1:1 primary/backup; removal or insertion without rack disruption when a second supply is installed |
| Dimensions (PSU) | 120.7 × 50.8 × 251.5mm, 1.39kg |
| Mounting | Half-height, left side of 3500 rack |
| Universal AC nominal input | 110 to 220 Vac nominal |
| Operating temperature | -30 °C to +65 °C (-22 °F to +150 °F) |
| Storage temperature | -40 °C to +85 °C (-40 °F to +185 °F) |
| Humidity | 95%, non-condensing |
| Minimum loading | No minimum rack load is required |
| Out of range protection | Under-voltage does not harm the supply or PIM; over-voltage opens the fuse on the PIM |
| Universal AC PIM fuse (120M3877) | Fast blow, 5 A / 500 Vac, 6.3 × 32 mm |
| Hazardous area approvals | cNRTLus Class I Division 2 Groups A, B, C, D and Class I Zone 2; ATEX/IECEx II 3 G; T4 at Ta = -20 °C to +65 °C |
| EMC / safety standards | EN 61000-6-2, EN 61000-6-4, EN 61010-1 |
| Maritime | DNV GL and ABS |
3500/15 Ordering Information and Part Numbers
The supply is ordered as 3500/15-AA-BB-CC. Field A is the power supply type in the top slot and field B the type in the bottom slot. The codes are 03 Legacy High Voltage DC (88 to 140 Vdc), 04 Legacy Low Voltage DC (20 to 30 Vdc), 05 Universal AC Voltage (85 to 264 Vac rms), 06 High Voltage DC Supply and 07 Low Voltage DC Supply; field B also allows 00 when no second supply is required. Field C is the agency approval: 00 none, 01 CSA / NRTL / C (Class 1, Division 2) and 02 ATEX / IECEx / CSA (Class 1, Zone 2).
Current-generation spares are 106M1079-01 (Universal AC Power Supply Module) with 106M1081-01 (Universal AC Power Input Module), 114M5329-01 (High Voltage DC Power Supply) with 115M7750-01 (High Voltage DC PIM), and 114M5330-01 (Low Voltage DC Power Supply) with 114M5335-01 (Low Voltage DC PIM). Legacy spares are 129486-01 (Legacy High Voltage DC Power Supply Module), 129478-01 (Legacy High Voltage DC Power Input Module), 133292-01 (Legacy Low Voltage DC Power Supply Module) and 133300-01 (Legacy Low Voltage DC Power Input Module).
Small parts are listed as well. Fuse 01720025 serves the AC Power Input Module and the Legacy High Voltage DC PIM, 01720045 serves the Low Voltage DC and Legacy Low Voltage DC PIMs, 120M3877 is the fast-blow fuse for the Universal AC PIM and 129M0198 is the fuse for the High Voltage DC PIM. Replacement connectors are 118M0915-01 for the Universal AC PIM and 118M0915-02 for the DC PIM. Item 131150-01 is the Power Supply Blank Front Panel and 128085-01 the Rear Input Connector Cover.
3500/15 Legacy Compatibility and Slot Arrangement
Supply and Power Input Module must belong to the same generation. Bently Nevada states that the Universal AC Power Supply and its PIM are not compatible with the legacy 3500 AC supply or with the legacy High Voltage AC and Low Voltage AC PIMs. In the same way, the current High Voltage and Low Voltage DC supplies and PIMs cannot be mixed with the legacy DC supplies and PIMs. When replacing a failed unit in an older rack, identify the installed PIM first and order the matching module, or replace both items as a pair.
Each rack has two half-height supply slots on the left side, and each PIM is a half-height module located directly behind its supply. AC and DC units can be combined in any arrangement, and either one can carry a full rack on its own. With two fitted, the lower slot is the primary and the upper slot is the backup, and one can be withdrawn or inserted without disturbing the rack while the other is in service. In hazardous areas the Universal AC input is limited to 85 to 250 Vac rms instead of 85 to 264 Vac rms.
Request a Quote for 3500/15 AC/DC Power Supply Module
Contact Seven Star LLC for pricing and availability on the Bently Nevada 3500/15 AC/DC power supply module across Oman and the GCC. Our team can help select the correct input variant and redundancy configuration for your machinery protection rack.
Choosing the Correct 3500/15 Variant
The 3500/15 is supplied as a pair of parts: the front power supply module and the power input module (PIM) that sits behind it. The PIM defines the input type and must match the site supply, so the selection starts with the rack’s feed rather than the module itself:
- Universal AC – for racks fed from a UPS or instrument AC distribution board.
- High-voltage DC – for substations and plants with a DC battery system in the 88–140 VDC band.
- Low-voltage DC – for 24 VDC instrument supplies, noting the much higher input current drawn at this voltage when sizing cables and breakers.
- Hazardous-area racks – confirm the approval option against the rack location, because the permitted AC input range differs from the non-hazardous version.
A redundant rack may use two different input types, for example one AC and one DC supply, which gives independence from a single power source. When ordering spares, copy the full part number from the existing module and PIM label so the approval and input options are preserved.
Installation and Redundancy Practice
- Feed primary and backup supplies from separate breakers, and ideally separate sources, so a single upstream fault cannot drop both.
- Size the upstream protection for the full-rack current of the chosen variant, not the typical load.
- Route power wiring away from transducer and signal cabling inside the cabinet to limit noise on vibration channels.
- After installation, confirm that both Supply OK LEDs are lit and that the rack reports no power supply alarm in the configuration software.
Maintenance and Troubleshooting
Because the modules are hot-swappable in a redundant rack, a failed supply can be replaced without interrupting machinery protection, but the work should still be covered by a permit and the remaining supply verified healthy first. If a Supply OK LED is off, check the input voltage at the PIM terminals and the upstream breaker before condemning the module. Intermittent alarms often come from a supply operating near the edge of its input range, for example a DC battery bus during charging or discharge. Many sites keep one tested spare module and PIM per input type, which is sensible given how long lead times on protection-system hardware can be.
Where It Is Used in the Region
In Oman and the GCC, 3500 racks protect gas turbines, steam turbines, compressors, large pumps and generators in power stations, LNG and gas processing plants, refineries and oil export facilities. The power supply is the one module every channel in the rack depends on, so it is a frequent item in critical spares lists and turnaround scopes.
Sourcing Through Seven Star LLC
Send us the module and PIM part numbers, or a photo of the labels, and we will confirm compatibility with your rack and quote genuine Bently Nevada hardware with the relevant manufacturer documentation.
Browse the full Bently Nevada range or see more Vibration products supplied by Seven Star LLC in Oman and the GCC.
See also: Bently Nevada 128718-01 Keyphasor External Termination Block; Bently Nevada 330400 Accelerometer Acceleration Transducer.
Other Models in the Bently Nevada 3500 Machinery Protection System Range
Seven Star LLC supplies models from the Bently Nevada 3500 Machinery Protection System range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Bently Nevada 3500 Machinery Protection System | Vibration Monitoring | View details |
| 3500/15 AC/DC Power Supply Module | Vibration Monitoring | You are viewing this model |
| 3500/25 Keyphasor® Module | Vibration Monitoring | View details |
| 3500/22M Transient Data Interface (TDI) | Vibration Monitoring | View details |
| Bently Nevada 3500/33 16-Channel Failsafe Relay Output Module – 149992-02 | Vibration Monitoring | View details |
| Bently Nevada 3500/32M 4-Channel Relay Module | Vibration Monitoring | View details |
| 3500/40M Proximitor® Monitor | Vibration Monitoring | View details |
| Bently Nevada 3500/42M Proximitor Seismic Monitor | Vibration Monitoring | View details |
| Bently Nevada 3500/45 Position I/O Module – 135137-01 | Vibration Monitoring | View details |
| Bently Nevada 3500/50 Tachometer Module | Vibration Monitoring | View details |
| 3500/60 Temperature Monitor | Vibration Monitoring | View details |
| Bently Nevada 3500/60-01-00 Temperature Monitor Module | Vibration Monitoring | View details |
Datasheets & Documents
- Datasheet Bently Nevada 3500/15 AC and DC Power Supply Datasheet Download
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About brand
Bently Nevada is the American machinery protection and condition monitoring brand behind the 3500 rack, the 3300 XL proximity probe and the System 1 software. It was founded in 1961 in Minden, Nevada, and is today a Baker Hughes business.
Seven Star LLC is an independent supplier in Muscat. We list Bently Nevada monitors, I/O modules, probes, proximitors, velocity transducers and transmitters for rotating equipment in Oman and the GCC, and source them by full part number.
Bently Nevada company profile
| Established | 1961, Minden, Nevada, USA, by Donald E. Bently. The business started earlier as Bently Scientific in Berkeley, California (1956). |
|---|---|
| Known for | The first commercial eddy-current proximity transducers for measuring shaft vibration and position on high-speed turbomachinery |
| Ownership | Acquired by GE Energy in 2002; part of Baker Hughes since GE Oil & Gas combined with Baker Hughes in 2017 |
| Rack generations | 5000 series (from 1965), 3300 series (from 1988), 3500 series (from 1995), Orbit 60 (current platform) |
| Product families | Machinery protection racks, proximity probes and proximitors, Keyphasor sensors, velocity and acceleration transducers, 2-wire vibration transmitters, general-purpose monitors, portable analyzers, wireless sensors and System 1 condition monitoring software |
| Typical machines | Steam and gas turbines, centrifugal and reciprocating compressors, pumps, motors, generators, fans and gearboxes |
Milestones
- 1956: Donald E. Bently starts Bently Scientific in Berkeley, California.
- 1961: The company moves to Minden, Nevada, as Bently Nevada.
- 1965: The 5000 series monitoring system is introduced.
- 1988: The 3300 series follows.
- 1995: The 3500 machinery protection system is launched.
- 2002 and 2017: GE Energy acquires Bently Nevada; it becomes part of Baker Hughes in 2017.
Bently Nevada product series
| Series | Type | What it does |
|---|---|---|
| 3500 | Machinery protection rack | Continuous online protection with alarm and danger relays. Modules include the 3500/15 power supply, 3500/20 rack interface, 3500/25 Keyphasor, 3500/42M proximitor/seismic, 3500/50 tachometer, 3500/60 temperature, 3500/33 relay and 3500/92 communication gateway |
| 3500 recip modules | Reciprocating compressor monitoring | 3500/70M impulse velocity, 3500/72M rod position and 3500/77M cylinder pressure |
| Orbit 60 | Protection and monitoring platform | The current Bently Nevada platform for protection, condition monitoring and data integration with System 1 |
| 3300 XL 8 mm | Proximity transducer system | Probe, extension cable and proximitor sensor for radial vibration, thrust position and Keyphasor reference on fluid-film bearing machines; also 5 mm and 25 mm versions |
| 330500 Velomitor, 190501 Velomitor CT | Piezo-velocity sensors | Casing velocity on rolling-element bearing machines and low-speed cooling tower fans |
| 990 and 991 | 2-wire transmitters | 4-20 mA vibration (990) and thrust position (991) signals straight into a PLC or DCS, without a monitor rack |
| 1900/65A, 2300 | Compact monitors | Protection for balance-of-plant pumps, fans and motors where a full 3500 rack is not justified |
A proximity probe measures the gap to the shaft, so it sees shaft movement inside a fluid-film bearing directly. A velocity or acceleration sensor sits on the casing and suits rolling-element bearing machines. Critical turbomachinery usually carries two X-Y probes per bearing, two axial probes for thrust position and a Keyphasor probe for speed and phase.
Where Bently Nevada systems are used
In Oman and the GCC, Bently Nevada racks and probes protect gas turbines, compressors and steam turbines in gas processing, LNG, refining, petrochemical, power and desalination plants. Many installations are 3500 racks that have run for years, so most requests are for like-for-like module, probe, extension cable and proximitor replacements, plus upgrades to newer monitors.
Ordering and replacement: what we need
For probes and proximitors, send the full part number with all option digits (for example 330101-00-27-10-02-05). The digits set the probe length, cable length, connector and approvals, and the probe, cable and proximitor must match in total system length. For 3500 modules, send the module and I/O part numbers from the rack and say whether the I/O is internal or external termination, or barrier type. If a module is obsolete, we quote the replacement that Bently Nevada names and point out any configuration or firmware change.
Facts checked against Baker Hughes Bently Nevada pages and published company history, October 2026.
Browse Bently Nevada products by category: Vibration.
FAQ
Questions about the 3500/15 AC/DC Power Supply Module
Answers from our engineering team on installation, compatibility and integration.
01Can the 3500/15 be replaced without shutting down the rack?
Yes, when a second supply is installed, either supply can be removed or inserted without disrupting the rack, following site maintenance procedures.
02What input types does the 3500/15 support?
It is available in AC and DC input variants; the correct version should be selected to match site utility power.
03How is redundancy achieved with the 3500/15?
Two 3500/15 supplies, in any combination of AC and DC, can be installed in a rack, with the lower slot as primary and the upper slot as backup.
04Which 3500 monitor modules is the 3500/15 compatible with?
It is compatible with the standard 3500 rack and monitor modules such as the 3500/40M, /42M, /44M, /50, and /60.
05Is Seven Star LLC an experienced supply partner for Bently Nevada products?
Yes, Seven Star LLC supplies genuine Bently Nevada 3500 series modules across Oman and the GCC, with technical support for rack specification.
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