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Brand: Bently Nevada
Bently Nevada 129478-01 3500/15 High DC Power Input Module
Description
Bently Nevada 129478-01 legacy high voltage DC power input module for the 3500/15
The Bently Nevada 129478-01 is the legacy High Voltage DC Power Input Module (PIM) for the 3500/15 power supply system. It handles the incoming 88 to 140 Vdc feed, such as a 110 Vdc station battery bus, and passes it to the legacy High Voltage DC power supply module 129486-01 that sits in front of it in the rack. In the manufacturer’s current datasheet it appears in the spares table as “Legacy High Voltage DC Power Input Module”.
DC-fed 3500 racks are common where machinery protection must stay alive without relying on an inverter. This page explains what 129478-01 is, how it differs from the newer High Voltage DC PIM, and what to check before replacing it. Seven Star LLC supplies 129478-01 in Oman and the GCC as an independent supplier in Muscat.
129478-01 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Bently Nevada (Baker Hughes) / 129478-01 |
| Description | Legacy High Voltage DC power input module (PIM) for the 3500/15 |
| Input voltage | 88 to 140 Vdc |
| Full-rack current draw | 2.5 A maximum (high-voltage DC supply options) |
| Partner supply module | 129486-01 Legacy High Voltage DC Power Supply Module |
| Replacement fuse | 01720025 (the same fuse as the AC power input modules) |
| Protection behavior | Under-voltage does not harm the supply or the PIM; over-voltage opens the fuse on the PIM |
| Rack position | Special half-height module located directly behind its power supply, left side of the rack |
| Ordering code reference | 3500/15 power supply type 03, Legacy High Voltage DC (88 to 140 Vdc), selectable for the top or bottom slot |
| Supply operating temperature | -30 to +65 °C (-22 to +150 °F) |
| Storage / humidity | -40 to +85 °C; 95 percent non-condensing |
| Minimum rack loading | No minimum rack load is required |
Legacy or new high voltage DC: do not mix them
The current 3500/15 datasheet is explicit that the High Voltage and Low Voltage DC power supplies and PIMs of the new generation are not compatible with the legacy High Voltage and Low Voltage DC power supplies and PIMs. The new High Voltage DC pair is the supply 114M5329-01 with PIM 115M7750-01, and ordering code 06 (top or bottom slot). The legacy pair is the supply 129486-01 with PIM 129478-01, ordering code 03. A 129478-01 module belongs only on a rack that already carries the legacy 129486-01 supply, and a new-generation PIM should not be fitted behind it.
| Item | Legacy high voltage DC | New high voltage DC |
|---|---|---|
| 3500/15 ordering code | 03 | 06 |
| Supply module | 129486-01 | 114M5329-01 |
| Power input module | 129478-01 | 115M7750-01 |
| Input range | 88 to 140 Vdc | 88 to 140 Vdc (same range, different hardware) |
| Replacement fuse | 01720025 | 129M0198 |
How the PIM fits into rack power
A 3500 rack can have one or two power supplies, in any mix of AC and DC. Either supply can power the full rack. When two are installed, the lower one is the primary and the upper one acts as the backup, taking over automatically if the primary fails. Each supply has its own PIM, so 129478-01 is the field-side connection for one DC supply, and removing or inserting a module does not disrupt the rack provided a second supply is present.
Compatible and related parts
- 129486-01: Legacy High Voltage DC Power Supply Module that this PIM serves.
- 125840-01 and 125840-02: legacy High and Low Voltage AC PIMs, for AC-fed racks.
- 133292-01 and 133300-01: Legacy Low Voltage DC supply and PIM (20 to 30 Vdc).
- 01720025: replacement fuse for the AC PIMs and the legacy High Voltage DC PIM.
- 118M0915-02: replacement connector for DC power input modules, as listed in the current datasheet spares.
- 128085-01 and 04310251: rear connector cover and screws for the power supply input.
- 129767: 3500/15 power supply user guide.
Selection checklist for 129478-01
- Check the label on the installed PIM. It must read 129478-01 or the corresponding legacy High Voltage DC part.
- Verify the DC bus voltage and polarity at the rack against 88 to 140 Vdc, including battery boost-charge peaks.
- Confirm the supply module in front is 129486-01 and not the new generation 114M5329-01.
- Plan to carry spare fuses 01720025, since over-voltage opens the PIM fuse.
- Decide if a full legacy-to-new-generation upgrade, which changes both the supply and the PIM together, would be a better use of the outage.
Installation, commissioning and maintenance
Isolate the DC bus at the source, confirm zero volts with a meter and take note of polarity markings before disconnecting. Remove the rear cover 128085-01, change the PIM and refit the cover with its screws. Re-energize and check that the power supply OK LED comes on and that the rack OK relay clears.
On redundant racks the other supply keeps the machinery protection online, but still advise operations before work starts. Record the measured DC voltage, the date and the fuse type in the maintenance log, and review battery charger float and boost settings so that the peak bus voltage stays within the 140 Vdc limit. If the fuse opens again after replacement, trace the cause upstream before repeating the attempt.
Typical applications in Oman and the GCC
110 Vdc buses supplied from station batteries are standard in power stations, gas compression stations, oil and gas facilities and desalination plants in Oman and the GCC. They give the machinery protection system power that does not depend on AC distribution during a blackout. The 129478-01 module is therefore found in older 3500 racks protecting gas turbines, steam turbines and large compressors, where battery-backed protection is a design requirement.
Information to send with your RFQ for 129478-01
- Part number 129478-01 and quantity.
- Photos of the PIM and of the power supply module label, including the revision.
- DC bus voltage, and whether the rack has one or two supplies.
- Delivery country and requested date.
Related Bently Nevada products: Bently Nevada 125680-01 3500/40M Proximitor I/O Module, Bently Nevada 128240-01 3500/42M Prox/Seismic I/O Module, Bently Nevada 149369-01 3500/25 Enhanced Keyphasor Module, Bently Nevada 3500/50 Tachometer Module, Bently Nevada 3500/50M Tachometer Module and Bently Nevada 3500/20 Rack Interface Module.
Documents and quotation
The 3500/15 AC and DC Power Supplies datasheet is attached on this page; 129478-01 appears in its spares table with the legacy High Voltage DC supply and the replacement fuse.
Send the part number 129478-01 and your rack details and Seven Star LLC will confirm availability and lead time in the quotation for Oman and the GCC.
Other Models in the 3500 15 Pim Range
Seven Star LLC supplies models from the 3500 15 Pim 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 125840-01 3500/15 HV AC Power Input Module | Vibration Monitoring | View details |
| Bently Nevada 129478-01 3500/15 High DC Power Input Module | Vibration Monitoring | You are viewing this model |
Datasheets & Documents
- Datasheet Bently Nevada 3500/15 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.
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Frequently Asked Questions
What is Bently Nevada 129478-01?
It is the legacy High Voltage DC Power Input Module (PIM) for the 3500/15 power supply. It accepts 88 to 140 Vdc and works with the legacy High Voltage DC supply module 129486-01.
Can 129478-01 be used with the new High Voltage DC supply?
No. The manufacturer states that the new High and Low Voltage DC supplies and PIMs are not compatible with the legacy versions. The new pair is 114M5329-01 with 115M7750-01.
What happens at over-voltage?
An over-voltage causes the fuse on the PIM to open. Under-voltage does not harm the supply or the PIM. The replacement fuse for the legacy High Voltage DC PIM is 01720025.
How much current does a full rack draw on high voltage DC?
The datasheet gives a maximum of 2.5 A for the high voltage DC options with a full rack. The low voltage DC option draws up to 11.0 A.
Can a rack have both an AC and a DC supply?
Yes. The rack can contain one or two power supplies in any combination of AC and DC, and either one can power a full rack. The lower slot is primary and the upper slot is backup.
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