Description

The Bently Nevada 3300/20-12-01-01-00-00, also cataloged as the 3300/20 Dual Thrust Position Monitor, operates as a dedicated hardware component for processing continuous axial shaft position and thrust bearing clearances within Bently Nevada 3300 Machinery Protection System platforms. Consequently, this microprocessor-driven module evaluates dual proximity probe inputs to drive high-speed machinery trip execution during unsafe rotor displacement events.

Suffix Breakdown & Model Matrix

• 3300/20: Base model number for the Dual Thrust Position Monitor.
• -12: Full-scale range option designating a metric configuration of 1.0-0-1.0 mm.
• -01: Transducer input compatibility option specifying 3300 or 7200 Proximitor sensor systems (200 mV/mil scale factor).
• -01: Alarm relay option designating an epoxy-sealed relay module assembly.
• -01: Agency approval option specifying CSA, NRTL, and C hazardous area safety certifications.
• -00: Internal safety barrier option designating no internal zener barriers installed.
• -00: Special modification option designating a standard production hardware configuration without variations.

Hardware Specifications

Transducer Interface & Mechanical Monitoring Characteristics

This monitor converts analog input voltages to enforce exact eddy-current probe scaling across dual axial transducer loops. Specifically, internal conditioning networks perform real-time gap voltage validation (-10 VDC targets) to verify baseline reference positioning before tracking raw physical shaft displacement variations. Furthermore, the analog input channels deploy active cross-talk suppression filters to neutralize reciprocal sensor interference, protecting the high-fidelity signals that record high-speed rotor dynamics.

Frequently Asked Questions

Q: How does the monitor mitigate false machinery shutdowns if an axial transducer line disconnects?

A: The hardware incorporates an automated Not OK diagnostic system. If field voltages shift past the calibrated linear operating limits, the monitor clamps the 4-20 mA loop to an error level and blocks the Danger relays from executing a trip command.

Q: What physical terminal limits apply to the dual internal epoxy-sealed relays?

A: The relays function as independent dry contacts rated for standard industrial control currents. Technicians must wire these elements into the emergency shutdown loop using the matching rear terminal block, ensuring that external loads do not violate the stated factory contact ratings.

Field Installation Guidelines

1. Insert the main monitor module smoothly into the chosen 3300 chassis slot until the rear-facing edge connectors seat into the backplane bus.
2. Fasten the matching rear-facing epoxy-sealed relay terminal assembly straight onto the backplane pins at the back of the chassis frame.
3. Terminate the overall coaxial cable shield drains cleanly at the primary plant instrumentation ground bus bar, keeping the shields floating at the machine side to avoid ground current loops.
4. Set the internal hardware configuration jumpers to define Alert and Danger relay logic variables before starting up live rotating asset testing.