Bently Nevada 3300/50-02-01-00-00 Tachometer Monitor

Description

The Bently Nevada 3300/50-02-01-00-00 is a Zero Speed Tachometer Monitor designed for critical machinery rotative speed and condition monitoring within the 3300 System platform. Operating as a single-channel monitoring module, it accepts dual transducer inputs and utilizes internal voting logic to prevent false trip indications caused by a single sensor failure. The 3300/50-02-01-00-00 variant is configured specifically as a Zero Speed Tachometer (Type Option 02) with Epoxy Relay outputs (Alert Relay Option 01), CSA/NRTL/C agency approvals (Option 00 for standard applications without specialized certifications), and no internal safety barriers (Option 00).

The front panel features dual 5-digit LCD displays that output shaft rotative speed in RPM alongside probe gap voltage, providing operator visibility into operating parameters and transducer health. It includes BNC buffered transducer outputs on the front panel for diagnostic equipment hookup, along with user-programmable proportional analog outputs (current or voltage) on the rear terminal strip for plant recording systems.

While providing continuous monitoring, Alert status, and proportional analog feedback for data logging, the 3300/50-02-01-00-00 tachometer is designed strictly for machinery condition monitoring and annunciation. It is not engineered for independent use as an emergency overspeed protection or speed control system.

Features

• Dual-Transducer Input Voting: Accepts inputs from two independent transducers with internal voting logic to maintain system integrity and minimize false alarms.
• Zero Speed Detection: Configured specifically for zero speed monitoring, functioning reliably at operating thresholds below 100 RPM.
• Integrated Front Panel Display: Features an 84 mm x 38 mm LCD displaying 5-digit RPM values, transducer gap voltage, and operational status indicators.
• Buffered Diagnostic Outputs: Provides front-panel coaxial BNC connectors for direct, short-circuit-protected signal access during field troubleshooting.
• Programmable Proportional Outputs: Delivers configurable rear terminal recorder outputs (+4 to +20 mA, 0 to -10 Vdc, or +1 to +5 Vdc) proportional to shaft rotative speed.
• Epoxy Alarm Relays: Includes dual epoxy-sealed relay drives for field-adjustable Alert 1 and Alert 2 annunciation.

Applications

• Turbomachinery Rotative Speed Monitoring: Continuous speed and zero speed state measurement for steam, gas, and industrial turbines.
• Rotating Equipment Machinery Protection: Shaft speed tracking on high-power compressors, industrial gearboxes, and large motor drives.
• Zero Speed Turning Gear Integration: Zero speed status verification for engaging turning gear systems on power generation units.

Ordering Information

Technical Specifications

General

Signal & Transducer Inputs

Performance Ranges & Accuracy

Outputs & Alarms

Environmental & Mechanical

Connections / Interfaces

Installation Guidelines

1. Pre-Installation Inspection: Verify that the model number matches 3300/50-02-01-00-00 and check the circuit board jumpers for correct input configuration before inserting the module into the rack.
2. Rack Slot Placement: Install the monitor into any available slot in the 3300 system rack except slots 1 and 2, which are reserved exclusively for the Power Supply and System Monitor.
3. Wiring Connections: Connect transducer field wiring using 3-conductor shielded cable. Connect the cable shields to a single earth point ground to prevent ground loops.
4. Zero Speed Enable Wiring: If utilizing the zero speed alarm feature, wire an external contact closure to the designated Zero Speed Enable terminals on the rear terminal strip.
5. Power Verification: Ensure the rack power supply is configured for the correct transducer supply voltage (-24 Vdc or -18 Vdc) based on the proximity sensors installed.

Configuration / Commissioning / Replacement

1. Jumper Configuration: Set onboard plug-in jumpers for input type (Proximitor or Magnetic Pickup), recorder output mode (+4 to +20 mA, 0 to -10 Vdc, or +1 to +5 Vdc), and alarm logic (latching or nonlatching) prior to commissioning.
2. Threshold Setting: Set transducer thresholds using manual voltage settings (0 to -18 Vdc) or auto-threshold mode depending on operational speed requirements. Note that option 02 (Zero Speed) is shipped configured for manual threshold.
3. Alarm Setpoint Adjustment: Adjust digitally stored Alert 1 and Alert 2 setpoints using the tamper-proof switches on the monitor circuit board and up/down switches on the System Monitor front panel.
4. Replacement Considerations: Before replacing an existing module, record the physical jumper settings on the old PWAs to ensure identical operating parameters on the replacement unit.