Product Description

Overview

The Bently Nevada 125840-02 is a precision-engineered Low Voltage AC Power Input Module (PIM) for the 3500 Series Machinery Protection System. Installed in the rear of the 3500 rack, it delivers stable AC power to the 3500/15 Power Supply Module, which converts it into regulated DC outputs for critical monitoring and communication cards. This module is designed for reliability in demanding industrial environments, ensuring continuous protection for rotating machinery.

Key Technical Features

AC Input Compatibility

• Nominal Input Voltage: 110 V AC

• Operational Range: 85–132 V AC RMS

• Peak Voltage Capability: 120–373 V AC

• Input Frequency: 47–63 Hz

Redundancy and Reliability

• Backup Operation: Works with dual power supplies for uninterrupted monitoring

• Hot-Swap Support: Allows front power modules to be replaced while the rack remains powered

Protection and Durability

• Over-Voltage Protection: Internal replaceable fuse safeguards the system from surges

• Under-Voltage Tolerance: Maintains functionality under voltage dips without damage

• Operating Temperature: -30°C to +65°C (-22°F to +150°F)

• Humidity Resistance: Up to 95% non-condensing

Status Indication

• Compatible with front-facing “Supply OK” LED indicators for real-time monitoring of power input and output performance

Technical Specifications

Applications

Ideal for turbine, motor, and generator monitoring in industrial plants with low-voltage AC distribution. Ensures continuous machinery protection, even under fluctuating voltage conditions.

Related Modules & Spares

• 127610-01: AC Power Supply Module

• 125840-01: High Voltage AC PIM

• 129486-01: High Voltage DC Power Supply Module

• 133292-01: Low Voltage DC Power Supply Module

• 01720025: Replacement Fuse (AC/High Voltage PIMs)

• 01720045: Replacement Fuse (Low Voltage DC PIM)

• 129767-01: Power Supply Operations & Maintenance Manual

FAQ

Q: Can the 125840-02 operate with voltages above 132 V AC?
A: The module can withstand brief voltage peaks up to 373 V AC, but continuous operation above the nominal range is not recommended.

Q: Is this module compatible with front hot-swap power supplies?
A: Yes, it supports hot-swapping when a secondary power supply is present in the rack.

Q: What indicates correct operation?
A: The front-facing “Supply OK” LED on the 3500/15 Power Supply Module confirms proper input and output functionality.