Bently Nevada 3300/14 Power Supply Module

Technical Overview

The 3300/14 provides regulated DC power for Bently Nevada 3300 monitoring system components. This power supply module converts AC mains voltage into stable DC outputs for rack-mounted instruments. Facilities depend on this module for consistent and noise-free power delivery to vibration monitors. The 3300/14 features built-in overvoltage and short-circuit protection for enhanced system safety.

Key Specifications

Parameter	Specification
Model	3300/14
Input Voltage	110 V AC or 220 V AC (user selectable)
Input Frequency	47–63 Hz
Input Power	60 VA (maximum)
Output Voltage 1	+24 V DC (for monitor circuits)
Output Voltage 2	-24 V DC (for monitor circuits)
Output Current	1.5 A (+24 V), 0.8 A (-24 V)
Ripple and Noise	≤5 mV RMS
Regulation	±0.1% (line and load)
Efficiency	65% (typical)
Overvoltage Protection	Yes (crowbar circuit)
Short-circuit Protection	Yes (foldback current limit)
Operating Temperature	0°C to +50°C
Storage Temperature	-20°C to +70°C
Humidity Range	5% to 95% RH (non-condensing)
Dimensions	241 mm × 102 mm × 38 mm
Weight	1.8 kg
Mounting Type	Panel mount or 19-inch rack
Indicator LEDs	Power OK, Fault
Cooling	Convection (no fan)
Isolation	2,000 V AC (input to output)

Power Input and Conversion

The 3300/14 accepts either 110 V AC or 220 V AC mains voltage via a rear-panel selector switch. This universal input accommodates various regional power standards without additional transformers. The module operates across a frequency range of 47 to 63 Hz. A high-efficiency switching converter delivers stable outputs under varying line conditions. The power supply provides 60 VA of total output power.

DC Output Specifications

This power supply generates two regulated DC outputs: +24 V and -24 V. The +24 V output delivers up to 1.5 A for powering monitor circuits and sensors. The -24 V output provides up to 0.8 A for complementary circuitry requirements. Both outputs maintain ripple and noise below 5 mV RMS for clean power delivery. Regulation remains within ±0.1% for both line and load variations. These tightly regulated outputs ensure reliable operation of sensitive measurement circuits.

Protection and Safety Features

The 3300/14 incorporates overvoltage protection using a crowbar circuit design. This crowbar circuit activates when output voltages exceed safe thresholds. Short-circuit protection employs foldback current limiting to prevent damage during fault conditions. An input fuse provides additional protection against catastrophic failures. Front-panel LEDs indicate Power OK and Fault status for immediate visual feedback.

Electrical Isolation and Noise Immunity

The 3300/14 provides 2,000 V AC isolation between input and output circuits. This high isolation voltage protects connected monitoring equipment from mains transients. The module’s switching design incorporates filtering to minimize conducted emissions. Such noise immunity ensures that vibration signals remain free from power supply interference. Consequently, the 3300/14 delivers clean power essential for accurate vibration measurements.

Mechanical Construction and Mounting

The 3300/14 comes in a rugged panel-mount housing measuring 241 mm × 102 mm × 38 mm. This module weighs 1.8 kg and fits standard 19-inch rack systems and panels. Users can mount the unit horizontally or vertically depending on cabinet space. The convection-cooled design eliminates fans and reduces potential failure points. Front-panel LEDs and terminals provide convenient access for installation and maintenance.

Efficiency and Thermal Performance

This power supply achieves typical efficiency of 65% under normal operating conditions. The 3300/14 dissipates heat through natural convection without requiring forced airflow. This passive cooling approach reduces noise and improves long-term reliability. The module operates across ambient temperatures from 0°C to 50°C. Storage temperatures from -20°C to 70°C do not affect the unit’s integrity.

Compatibility with Monitoring Systems

The 3300/14 integrates with all standard Bently Nevada 3300 series monitors and transducers. This power supply provides the required voltages for the 3300/25 accelerometer monitor and other modules. The unit also supports the 3300/20 displacement monitor and 3300/35 temperature monitor. System designers can use this power supply for complete rack-based monitoring solutions.

Installation Guidance

Mount the 3300/14 securely in a panel or rack using the supplied mounting brackets. Select the correct input voltage using the rear-panel selector before applying power. Connect the AC mains wiring to the designated input terminals with proper grounding. Wire the +24 V and -24 V outputs to the monitoring modules in the rack. Verify output voltages with a multimeter before connecting sensitive equipment. Perform periodic inspection of the power LEDs to ensure normal operation.