BENTLY 125840-02 | Low-Voltage AC Power Input Module

BENTLY 125840-02

Parameter	Value
Product Model	125840-02
Manufacturer	Bently Nevada
Product Type	Low-Voltage AC Power Input Module (3500/15 Series)
Input Voltage	85–132 VAC RMS (nominal 110 VAC)
Input Frequency	47–63 Hz
Output Voltage	+24 VDC (regulated)
Output Current	2 A continuous
Power Consumption	<1 W (standby), 12 W (full load)
Efficiency	92% typical
Operating Temperature	-40°C to +85°C (-40°F to 185°F)
Storage Temperature	-55°C to +100°C (-67°F to 212°F)
Dimensions	55 mm × 90 mm × 32 mm (W×H×D)
Weight	0.34 kg
Certifications	CE, UL, ATEX (Zone 2)
Compatibility	3500/15 series racks, 3500/05 chassis
Redundancy Support	Dual-module configuration (primary/backup)
Protection Features	Overvoltage, short-circuit, reverse-polarity

1. Wide Input Voltage Tolerance:
   The 125840-02 accepts AC inputs from 85–132 VAC RMS, accommodating unstable or fluctuating power sources common in aging industrial facilities. This eliminates the need for external voltage regulators, simplifying system design and reducing costs.
2. Redundant Power Architecture:
   When installed in pairs, the lower module acts as the primary power source, while the upper serves as a backup. This configuration ensures uninterrupted operation if one module fails, critical for applications like nuclear power plants or offshore rigs where downtime is catastrophic .
3. High Efficiency and Low Heat Generation:
   With 92% conversion efficiency, the module minimizes energy waste and heat dissipation, extending the lifespan of adjacent components. Its compact design (55x90x32mm) allows dense rack mounting without compromising airflow .
4. Robust Protection Mechanisms:
   Built-in overvoltage and short-circuit protection safeguards downstream modules from power surges or faults. Reverse-polarity protection prevents damage caused by incorrect wiring during installation .
5. Seamless Integration with 3500 Ecosystem:
   The module’s plug-and-play compatibility with Bently’s 3500 series racks and modules ensures hassle-free integration. For example, it powers the 3500/33 vibration monitor, enabling real-time analysis of turbine shaft dynamics without signal degradation .
6. Industrial-Grade Reliability:
   Rated for -40°C to +85°C operation and ATEX-certified for hazardous environments, the 125840-02 performs reliably in extreme conditions. Its fluoropolymer-coated circuit board resists corrosion from oil, chemicals, and salt mist, making it suitable for petrochemical plants or coastal facilities .

• Power Generation:
  In a coal-fired power plant, the 125840-02 powers the 3500/42M seismic monitor, which tracks boiler drum vibrations. By ensuring stable power during load fluctuations, it enables early detection of structural weaknesses, preventing costly boiler failures.
• Oil & Gas:
  On a subsea production platform, dual 125840-02 modules provide redundant power to the 3500/64M process variable monitor, which measures pressure and temperature in subsea pipelines. This setup ensures continuous data transmission even during storms or equipment malfunctions .
• Chemical Processing:
  In a pharmaceutical manufacturing plant, the module powers the 3500/22M transient data interface, which records high-speed vibration signatures of reactor agitators. Stable power ensures accurate analysis of bearing wear, preventing batch contamination due to unexpected downtime.
• Mining:
  In an underground mine, the 125840-02 supports the 3500/53 position monitor, which tracks conveyor belt alignment. Its wide input voltage range adapts to unstable mine-site power, reducing belt misalignment and material spillage.
• Metals & Minerals:
  In an aluminum smelter, the module powers the 3500/60 temperature monitor, which controls electrolytic cell cooling systems. Its high-temperature tolerance ensures consistent performance in 60°C ambient conditions, optimizing energy efficiency and reducing cell degradation.

• 127610-01 – AC power supply module for higher voltage inputs (200–240 VAC) .
• 125840-01 – High-voltage AC PIM (200–240 VAC input) for applications requiring broader voltage support .
• 129486-01 – High-voltage DC power supply module (100–250 VDC input) for hybrid AC/DC systems .
• 3500/05 – 19-inch rack chassis compatible with the 125840-02, supporting up to two power supplies .
• 3500/33 – Vibration monitor frequently paired with the 125840-02 for machinery health analysis .

1. Slide the 125840-02 into a left-side slot of the 3500/05 chassis, aligning the backplane connectors. Tighten captive screws to secure it against vibration.
2. Connect the AC input wires (85–132 VAC) to the terminal block, ensuring proper polarity. For redundant setups, install a second module in the adjacent upper slot and link their backup terminals .
3. Verify power output using a multimeter (24 VDC ±1%). Configure the 3500 system via Bently’s software to recognize the module and enable redundancy if needed.

• Monthly Checks: Inspect the module’s LED indicators for power status (green = operational, red = fault). Clean dust from vents using compressed air to maintain thermal efficiency.
• Annual Calibration: Use a precision power analyzer to verify output voltage accuracy within ±0.5%. Replace fuses (01720025 for AC PIMs) if blown during fault events .
• 5-Year Replacement: Replace the module if exposed to prolonged moisture or extreme temperatures, even if functional. Capacitor degradation over time can reduce efficiency by 10–15% .