Bently Nevada 125800-01 Keyphasor I/O Module

4-channel Monitors allow a single full-size (14 slots) 3500 rack to accommodate up to 56 monitoring channels. This efficient use of space results in lower installation costs by saving valuable cabinet space. It also facilitates sharing common components, such as displays, communicationsgateways, and power supplies, across more channels for less cost per channel.

The 3500 System’s alarm and event lists then provide time/date stamps that are synchronized with alarms and events in other processes and automation equipment. This reduces or eliminates the need for elaborate, hardwired “Sequence of Event” recorders.

Networked connections allow you to remotely configure a 3500 system and even assess the system when an instrument problem arises. You can implement simple changes, such as to an alarm setpoint or a filter corner, without traveling to the site in person. This is useful for installations at offshore platforms, compressor or pump stations, emergency generators, and other locations where on-site access to the instrumentation is inconvenient or impractical.

125800-01 is a Keyphasor I/O Module developed by Bently Nevada. It is a part of the 3500/25 Enhanced Keyphasor Module. The monitor modules in a 3500 rack receive Keyphasor signals from a half-height, a two-channel module called a Keyphasor Module. When the Keyphasor mark on the shaft aligns with the Keyphasor transducer, the module detects the alignment using magnetic pickups or proximity probes and converts the input signals into digital Keyphasor signals. For regular setup, the 3500 Machinery Protection System can accept up to four Keyphasor signals, and for paired configuration, it can accept up to eight.

125800-01 Functional Description

• A key phasor signal, which is produced by a rotating shaft or gear once per turn or several times per turn, can be used to precisely identify timing. As a result, shaft rotative speed and vector characteristics such as 1X vibration amplitude and phase can be measured by 3500 monitor modules and external diagnostic tools.
• The Enhanced Keyphasor Module is an enhanced 3500 system module. It improves on the previous design’s Keyphasor signal processing capabilities while maintaining total downward compatibility in terms of shape, fit, and function with current Keyphasor modules for usage in older systems.
• The Keyphasor module, PWA 125792-01, has been totally replaced with the more current 149369-01 module. When a system Keyphasor input is required for Triple Modular Redundant (TMR) applications, the 3500 system should use two Keyphasor modules. In this design, the modules function simultaneously to deliver both a primary and secondary Keyphasor signal to the other modules in the rack.

Features

• A system with more than four Keyphasor inputs may use a paired arrangement as long as there are no more than four major Keyphasor input signals. A paired design necessitates two consecutive monitoring stations in either the upper/lower or both half-slot locations.
• Four Keyphasor modules will accept four primary and four backup input channels and provide four output channels (one per module). A configuration of two paired and one non-paired Keyphasor module (three Keyphasor modules total) is also possible. In such a case, the user can configure the single non-paired Keyphasor (order either two 2-channel or one 1-channel and one 2-channel option)
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