Bently Nevada 3300/12-02-20-00 Power Supply Module
Bently Nevada 3300/12-02-20-00 Power Supply Module
The Bently Nevada 3300/12-02-20-00, also cataloged as the 3300/12 Power Supply Module, operates as a dedicated AC input supply for transducer excitation and rack backplane distribution within the 3300 Monitoring System.
Suffix Breakdown & Model Matrix
- 3300/12: AC Power Supply Module
- 02: High Voltage AC Input option (190–250 VAC)
- 20: 20-slot panel/rack mount configuration
- 00: No agency approvals (standard factory configuration)
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/12-02-20-00 |
| Brand | Bently Nevada |
| Origin | U.S.A |
| Weight | ~1.4 kg (3.0 lbs) |
| Dimensions | 2.0 in W × 8.0 in H × 13.0 in D (5.1 cm × 20.3 cm × 33.0 cm) |
| Operating Temp | 0 deg C to +65 deg C (+32 F to +150 F) |
| Storage Temp | -40 deg C to +85 deg C (-40 F to +185 F) |
| Relative Humidity | Up to 95%, non-condensing |
| Input Voltage Range | 190–250 VAC, single-phase |
| Input Frequency | 50–60 Hz |
| Max Input Current | 0.5 A maximum |
| Power-up Surge | 26 A peak (12 A RMS) for one cycle |
| Fuse Rating | 0.75 A slow-blow (convertible to 1.5 A for low-voltage jumper configuration) |
| Output Voltage | -24 VDC (+0%, -2.5%) or -18 VDC (+1%, -2%) selectable via jumper |
| Protection | Independent overload protection per monitor channel |
| System OK Relay | Integrated relay tracks fault conditions via input card |
Gap Voltage Validation and Rotor Dynamics Integration
The 3300/12 module supports proximitor excitation where gap voltage validation (-10 VDC reference targets) is critical for eddy-current probe scaling. This ensures accurate rotor dynamics monitoring by maintaining consistent displacement signals. The backplane distribution design suppresses cross-talk between adjacent channels, preserving fidelity in vibration and thrust position measurements.
Frequently Asked Questions (FAQ)
Q: Can the 3300/12 module be field-converted to low-voltage input? A: Yes. By altering the soldered jumper and replacing the fuse with a 1.5 A slow-blow, the input can be converted to 95–125 VAC.
Q: How does the System OK relay function? A: The relay is located behind the power supply module and drives the system OK line, reflecting fault conditions across the rack.
Q: Are transducer outputs protected against overload? A: Yes. Each monitor circuit board integrates independent overload protection for transducer voltages.
Field Installation Guidelines
- Install the module in designated rack slots per 3300 system allocation.
- Ensure correct AC input wiring and verify jumper configuration before energizing.
- Ground the chassis to dissipate electrostatic discharge.
- Maintain ambient conditions within specified operating and storage ranges.
- Route transducer wiring separately from high-voltage conductors to minimize interference.
- Confirm fuse rating matches the configured input voltage range.
Bently Nevada 3300/12-02-20-00 Power Supply Module
