Overview
The Bently Nevada 3300/03, also cataloged as the 3300/03 System Monitor, operates as a dedicated hardware component for Keyphasor signal conditioning, rack supervision, and communication interface control within the Bently Nevada 3300 Machinery Protection System.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/03 System Monitor |
| Brand | Bently Nevada |
| Origin | USA |
| Module Type | System Monitor Module |
| System Platform | 3300 Machinery Protection System |
| Rack Position | Slot 2, adjacent to power supply |
| Weight | Approximately 0.9 kg |
| Operating Temp | 0 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Relative Humidity | Up to 95%, non-condensing |
| Power Consumption | 2.0 W standard; 4.6 W with interface options |
| Keyphasor Inputs | Up to 4 proximity probe phase reference inputs |
| Input Impedance | 10 kOhm |
| Frequency Range | 60 to 30,000 cpm |
| Minimum Signal Amplitude | 0.5 V peak-to-peak |
| Transducer Supply Voltage | User programmable -24 VDC or -18 VDC |
| Front Panel Outputs | 4 buffered Keyphasor BNC outputs |
| Output Impedance | 100 Ohm |
| RS-232 Communication | Up to 19.2 kbaud, maximum 30 m distance |
| RS-422 Communication | Up to 19.2 kbaud SDI; up to 38.4 kbaud DDI, maximum 1,200 m distance |
| Hazardous Area Approval | CSA Class I Division 2 Groups A, B, C, D; ATEX II 3 G EEx nC[L] IIC |
Rotor Dynamics Signal Processing and Keyphasor Conditioning
The 3300/03 System Monitor processes Keyphasor reference signals for phase measurement and rotor position tracking across the 3300 rack. It accepts proximity probe timing signals, conditions the input waveform, and distributes buffered outputs to installed monitoring modules.
Furthermore, the module supports eddy-current probe scaling validation by maintaining stable signal conditioning between the proximity transducer and monitoring channels. The system uses gap voltage monitoring principles, including the typical -10 VDC operating target for eddy-current probe gap validation, to verify probe operating position and signal integrity.
The module also manages signal routing to reduce cross-talk effects between Keyphasor channels and vibration monitoring circuits. Therefore, the 3300/03 supports consistent phase reference data for rotor dynamics analysis and machinery protection calculations.
Frequently Asked Questions
Q: Can the 3300/03 operate without Keyphasor inputs connected?
A: Yes. The module can provide rack supervision and communication functions without active Keyphasor signals. However, phase reference functions require valid proximity probe inputs.
Q: What communication interfaces are available on the 3300/03?
A: The module supports Serial Data Interface (SDI) and Dynamic Data Interface (DDI) options through RS-232 and RS-422 communication connections.
Q: Does the 3300/03 provide direct vibration measurement channels?
A: No. The module provides system monitoring, Keyphasor conditioning, alarm control functions, and communication interfaces. Individual monitor modules perform vibration and condition measurements.
Field Installation Guidelines
Install the 3300/03 in rack position 2, directly beside the 3300 power supply module. Confirm that the rack backplane connections are fully seated before applying system power.
Connect Keyphasor probe wiring using shielded signal cables. Ground cable shields according to the plant grounding practice and avoid routing signal cables parallel to high-current power conductors.
Verify the proximity probe gap voltage before commissioning. Confirm that the Keyphasor input signal amplitude and frequency remain within the specified operating range.
For communication wiring, separate RS-232 and RS-422 cables from high-voltage switching circuits. Use proper termination practices for long-distance RS-422 connections to maintain signal integrity.
Check front-panel indicators after installation. The SUPPLIES OK LED should indicate normal rack power status, while TRIP MULTIPLY status should match the configured machinery protection logic.
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