Description

The Bently Nevada 3500/25 serves as the primary 3500/25 Enhanced Keyphasor Module utilized to execute phase reference and speed signal processing across 3500 Machinery Protection System platforms. This half-height, two-channel hardware component conditions raw inputs from proximity probes or passive magnetic pickups. It translates these physical pulses into digital phase tracking indices. These indices indicate precise timing matching when a shaft keyway passes the sensor focal line.

Hardware Specifications

Mechanical Monitoring & TSI Characterization

The 3500/25 manages automated eddy-current probe scaling to handle diverse target materials and physical air gap spacing. Consequently, the module runs baseline gap voltage validation (-10 VDC targets) during startup cycles to guarantee that the sensor remains positioned within its linear electrical range. If multi-event-per-turn gears provoke sensor field interference, internal cross-talk suppression logic filters out high-frequency harmonic distortion. This maintains a clean single pulse-per-turn timeline for evaluating non-linear rotor dynamics.

Frequently Asked Questions

Q: Can the 3500/25 module accept direct inputs from passive magnetic pickups without an external power source?

A: Yes. The module infrastructure accommodates passive magnetic pickups, but the shaft rotational velocity must exceed 200 rpm to generate the minimum 500 mV peak-to-peak threshold required by the internal conditioning circuitry.

Q: How many Keyphasor signal lines can a single 3500 protection rack distribute concurrently?

A: A single standard system rack accepts up to four primary Keyphasor inputs under normal baseline allocation, and expands up to eight signal paths total when configured in a paired, half-height module layout.

Field Installation Guidelines

• Shield Grounding Protocol: Terminate all coaxial transducer shield braids directly at the instrumentation grounding rail within the 3500 housing enclosure. Maintain a floating, fully insulated termination at the field probe bracket to completely avoid induced ground loop interference.
• Chassis Insertion Adapter: Use the dedicated full-height slot adapter assembly when inserting this half-height module into standard 3500 system slots. Slide the chassis forward until the backplane multi-pin interface pins lock firmly, then secure the panel screws to 0.56 N-m of torque.
• Transducer Supply Restrictions: Ensure external field loading does not exceed the absolute -24 VDC, 40 mA maximum current threshold supplied per channel output. Over-current conditions trigger automatic internal current limits, which degrades the phase reference waveform edge resolution.