Introduction
The Bently Nevada 3500/20-01-01-00 125760-01 is a critical component within the GE Bently Nevada 3500 Machinery Protection System. It is a Hot-Swap Redundant Power Supply Module designed to provide highly reliable and clean DC power to all the monitoring modules (such as vibration, speed, and temperature monitors) installed in a 3500 rack.
Its primary function is to convert standard AC mains power (120V/240V AC) into the regulated, low-voltage DC power required by the system's sensitive electronic modules. The "Hot-Swap Redundant" design means that two identical power supply modules can be installed in a single rack. If the primary power supply fails, the secondary one immediately and seamlessly takes over without interrupting the monitoring system's operation, ensuring continuous protection for critical machinery. The "-01" suffixes typically indicate specific revisions or hardware configurations.
Parameters / Specifications
The key technical specifications for the Bently Nevada 3500/20 Power Supply are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 3500/20-01-01-00 125760-01 |
| Product Line | GE Bently Nevada 3500 System |
| Module Type | Redundant, Hot-Swap Power Supply |
| Input Voltage | 85 to 265 V AC, 47 to 63 Hz (Auto-sensing) / 120 to 370 V DC |
| Output Voltage | +5 V DC and ±15 V DC (for the rack backplane) |
| Output Power | Typically 105 Watts (sufficient to power a fully populated rack) |
| Redundancy | Supports N+1 redundancy when two modules are installed in a rack. |
| Hot-Swap Capable | Yes, can be inserted or removed from the rack without system shutdown. |
| Status Monitoring | LED indicators for Power On, AC OK, and DC OK. |
| Mounting | Slides into a dedicated slot in the 3500 rack. |
| Dimensions (H x W x D) | Standard 3500 Series Module (Approx. 3.9" x 8.7" x 7.5" or 99 mm x 221 mm x 190 mm) * |
| Weight (Approx.) | 4.0 lbs (1.8 kg) |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) |
Note: The exact dimensions are standardized for all 3500 series modules to fit into the 3500 rack.
Application Scenarios
The 3500/20 Power Supply is the foundational power source for the entire 3500 monitoring system. It is deployed in every installation where a 3500 rack is used to protect critical assets.
Typical application scenarios include:
Providing System Power for Machinery Protection Racks:
Installed in the power supply slots of a 3500 rack to provide operational power to all monitoring modules (e.g., 3500/42M Speed Monitor, 3500/25 Vibration Monitor) that are protecting turbines, compressors, and pumps.
Ensuring System Uptime with Redundant Configuration:
Used in pairs to create a redundant power system in a single rack. This configuration is essential for critical applications where a single point of failure in the power supply cannot be tolerated, such as in an offshore platform compressor or a main turbine in a power plant.
Maintenance and Hot-Swap Replacement:
Allowing for proactive maintenance or replacement of a faulty power supply module without the need to shut down the entire monitoring system or the machinery it protects. A technician can simply pull the faulty unit and insert a new one while the system continues to operate on the redundant unit.
Industries of Use:
Oil & Gas (Upstream, Midstream, Downstream)
Power Generation (Nuclear, Fossil Fuel, Combined Cycle)
Petrochemical & Chemical Plants
Marine (Propulsion systems)
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