Bently Nevada 3500/15 125840-02 Low Voltage AC Power Input Module

Overview

The Bently Nevada 3500/15 125840-02 is a Low Voltage AC Power Input Module (PIM) designed for the 3500 Series Machinery Protection System. As a half-height module, it converts a wide range of low-voltage AC input into regulated DC power suitable for all 3500 rack modules, ensuring reliable operation of vibration monitoring and machinery protection systems in critical industrial environments such as turbines, compressors, pumps, and motors.

350015 125840-02

350015 125840-02

Specifications & Parameters

Key Features & Characteristics

• Wide Input Voltage Range: Accepts 85–132 Vac RMS, accommodating global low-voltage AC standards with robust tolerance.
• Redundant Power Architecture: The 3500 rack supports dual power supply configurations. When two supplies are installed, the lower slot serves as the primary and the upper slot as the backup. If the primary fails, the backup seamlessly assumes the load without system interruption.
• Hot-Swap Capability: Modules can be removed or inserted without disrupting rack operation, provided a second power supply remains installed. This enables online maintenance and minimizes downtime in continuous-process industries.
• Front-Panel Status Indication: Equipped with a Supply OK LED that provides immediate visual confirmation of proper power supply operation.
• Compact Half-Height Design: Optimized for space-efficient installation within the 3500 rack, leaving maximum slot capacity for monitoring and I/O modules.
• Overvoltage & Undervoltage Protection: The module is designed so that undervoltage conditions do not harm the supply or PIM; overvoltage events cause the fuse to open, protecting downstream components.

Installation Guidelines

1. Rack Positioning: The 3500/15 Power Supply and its associated PIM must be installed in the designated half-height slots on the left side of the 3500 rack. The PIM mounts directly behind its corresponding power supply module.
2. Dual-Supply Configuration: For redundancy, install one supply in the lower slot (primary) and the second in the upper slot (backup). Any combination of AC and DC supplies is permitted.
3. Single-Supply Configuration: If only one power supply is required, leave the second slot empty or install a blank front panel (P/N 131150-01).
4. Wiring: Use the appropriate replacement connector for the AC Power Input Module. Ensure proper grounding and adherence to local electrical codes.
5. Environmental Compliance: Install within the specified temperature and humidity ranges. Avoid condensing environments to prevent moisture ingress.

Repair & Maintenance

• Fuse Replacement: The 125840-02 shares the replacement fuse P/N 01720025 with AC PIMs and High Voltage DC PIMs. Always power down the respective supply (or rely on redundant backup) before fuse replacement.
• Module Replacement: Due to hot-swap support, a faulty 125840-02 can be replaced while the rack remains powered by the redundant supply. Always verify the Supply OK LED on the backup supply is illuminated before removing the primary.
• Troubleshooting: If the Supply OK LED is extinguished, check input voltage at the PIM terminals, inspect/replace the fuse, and verify rack load does not exceed supply capacity. Persistent failure typically indicates internal PIM or power supply module degradation.
• Spare Parts Strategy: Maintain on-site spares of both the PIM (125840-02) and its corresponding power supply module to minimize Mean Time To Repair (MTTR) in critical machinery protection applications.

Same-Series Models & Compatible Part Numbers

Ordering Code Structure (3500/15-AXX-BXX-CXX)

• 3500/15-02-02-00: Dual High Voltage AC supplies (redundant)
• 3500/15-02-00-00: Single High Voltage AC supply
• 3500/15-05-05-00: Dual Universal AC supplies (new generation)
• 3500/15-05-00-00: Single Universal AC supply