Description
Bently Nevada 3300/12-02-20-00 AC Power Supply Module
The Bently Nevada 3300/12-02-20-00, also cataloged as the 3300/12 AC Power Supply Module, operates as a dedicated hardware component for regulated DC voltage generation within the Bently Nevada 3300 Machinery Monitoring System rack backplane.
Suffix Breakdown & Model Matrix
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Suffix Position
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Code
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Description
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Base Model
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3300/12
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AC Power Supply Module
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Voltage Option
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-02
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220 Vac (175 to 250 Vac), 50/60 Hz
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Agency Approval
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-20
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Multiple Approvals (CSA/NRTL/C, ATEX/BASEEFA)
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Safety Barrier
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-00
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None (No internal safety barriers installed)
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Hardware Specifications
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Parameter
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Specification
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Brand
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Bently Nevada
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Origin
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United States
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Operating Temp
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-30 degC to +65 degC
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Storage Temp
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-40 degC to +85 degC
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Humidity
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95% non-condensing relative humidity
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Input Voltage
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175 to 250 Vac
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Input Frequency
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47 to 63 Hz
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Max Power Consumption
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150 W
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Output Voltages
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+24 Vdc, -24 Vdc, +5 Vdc (Regulated)
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Slot Location
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Slot 1 (Left-most)
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Eddy-Current Probe Scaling Considerations
This module supplies the necessary excitation power for eddy-current proximity transducer systems integrated into the 3300 rack. The regulated +24 Vdc and -24 Vdc outputs must maintain stable ripple characteristics to ensure accurate gap voltage validation. Improper power supply loading can shift the probe scaling factor, affecting the target -10 Vdc gap voltage setpoint required for shaft vibration measurements and rotor dynamics analysis.
Frequently Asked Questions
Q: Can this power supply module be hot-swapped while the 3300 rack is operational?
A: No. The 3300/12 module requires a complete removal of AC mains input and should only be inserted or removed when the rack is de-energized to prevent arcing and backplane damage.
Q: What is the function of the LINE LED on the front panel?
A: The LINE LED indicates the presence of AC input voltage at the terminals. It illuminates regardless of whether the internal DC outputs are regulating correctly.
Q: Does the -20 agency approval option affect the physical dimensions or mounting of the module?
A: No. The -20 suffix denotes compliance with specific hazardous area certifications (CSA, ATEX). The physical form factor and backplane interface remain identical to standard modules.
Field Installation Guidelines
Install the module into Slot 1, the left-most position of the 3300 rack chassis. Ensure the AC input voltage selection matches the facility mains supply (175-250 Vac) prior to energizing. Verify proper torque on the AC terminal block connections. Ground the rack chassis using a low-impedance earth connection to mitigate common-mode noise and ensure accurate transducer readings.
