Description
Bently Nevada 3300/03-02-00 System Monitor Module with 89998-01 Terminal Board
Configured for rack-level diagnostics and serial data interfacing in the Bently Nevada 3300 Machinery Protection System, the Bently Nevada 3300/03-02-00 (base model 3300/03 System Monitor Module) executes direct electrical monitoring of module health, Keyphasor signal conditioning, and RS-422/RS-232 communications to external control platforms.
Suffix Breakdown & Model Matrix
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Option Code
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Parameter
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Configuration Details
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3300/03
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Module Type
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System Monitor Module
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-02
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Serial Data Interface
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RS-422 SDI up to 19.2 k baud
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-00
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Internal Barriers
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None
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89998-01
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Terminal Board
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Rear I/O termination and distribution
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Hardware Specifications
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Parameter
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Specification
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Model Brand
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Bently Nevada
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Origin
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USA
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Weight
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Module: 0.7 kg; Combined with TB: 1.2 kg
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Dimensions
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Module: 20.3 cm x 5.1 cm x 33.0 cm; Terminal Board: 19.8 cm x 16.2 cm x 10.8 cm
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Operating Temp
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0 degC to +65 degC
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Power Consumption
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Base: 2.0 W; With comms: up to 4.6 W
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Input Impedance
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10 kΩ
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Keyphasor Freq Range
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60 to 30,000 cpm (1 Hz to 500 Hz)
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Signal Amplitude Min
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0.5 V peak-to-peak
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Output Impedance
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100 Ω
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Dynamic Signal Accuracy
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±0.3% FS typical @ 25 degC
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Phase Accuracy
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±0.2° typical, ±1° max
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RPM Accuracy
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±1 rpm typical
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Eddy-Current Probe Scaling and Cross-Talk Suppression
The 3300/03 applies fixed scaling factors to each Keyphasor input derived from eddy-current proximity probes, ensuring consistent amplitude and phase correlation under rotor dynamic conditions. Channel isolation suppresses cross-talk between multiple probe circuits, preserving timing accuracy for speed and phase measurements. Gap voltage validation at -10 VDC targets is mandatory before commissioning to maintain linear operation within the defined frequency range.
Frequently Asked Questions
Q: Can the RS-422 SDI interface operate simultaneously with the RS-232 port?
A: Yes. Both interfaces function concurrently but must be connected to separate external devices to prevent bus contention.
Q: Does the module support hot-swap replacement?
A: No. Power-down of the rack slot is required before removal or insertion to avoid transient disruption to the backplane bus.
Q: What is the maximum total cable length for four Keyphasor probes?
A: Industry practice limits each probe extension cable to 15 meters to ensure signal integrity within the specified amplitude and phase tolerances.
Field Installation Guidelines
Install the module in Slot 2 of the 3300 rack, ensuring proper engagement with the backplane connector. Mount the 89998-01 terminal board securely to the rear chassis, torque terminals to 0.5 N·m, and ground cable shields at the monitor end only. Separate signal wiring from power cabling by at least 50 mm to minimize EMI. Validate all Keyphasor inputs for correct gap voltage and amplitude before enabling system monitoring functions.
