Bently Nevada 3500/25 Enhanced Keyphaser Module

Basic Introduction

• Module Type1: It is a half-height, two-channel module, which means it occupies relatively little space in the 3500 rack and can perform dual-channel keyphasor signal processing.
• Function2: The 3500/25 is mainly used to provide keyphasor signals to other monitor modules in the 3500 rack. It receives input signals from proximity probes or magnetic pickups and converts them into digital keyphasor signals when the keyphasor mark on the shaft aligns with the keyphasor transducer.

Technical Specifications12

• Power Consumption: The typical power consumption is 3.2 watts, which is energy-efficient and helps to reduce the overall power consumption of the monitoring system.
• Input Signal Range: For non-isolated I/O modules, it is +0.8 V to -21.0 V; for isolated I/O modules, it is +5 V to -11 V.
• Output: It has two buffered keyphasor outputs with a maximum buffered output impedance of 504 Ω. The front of the rack is equipped with two coaxial connectors for buffered keyphasor outputs, and the back of the rack also has two buffered keyphasor outputs with euro style connections.
• Power Supply: It provides a -24 VDC, 40 mA maximum per channel power supply for keyphasor transducers.

Operational Features2

• System Compatibility: For a regular setup, the 3500 machinery protection system can accept up to four keyphasor signals, and for a paired configuration, it can accept up to eight. In triple modular redundant (TMR) applications, two keyphasor modules are usually used and they work in parallel to provide primary and secondary keyphasor signals to other modules in the rack.
• Mounting Requirement: The main module needs 1 half-height front slot. When mounting in full-height slots, a special mounting adapter is required for half-height main modules. The I/O module needs 1 full-height rear slot.

Applications