BENTLY KEYPHASOR MODULE
Origin: United States
Brand: Bently Nevada
3500/25-PWA149369-01 is an Enhanced Keyphasor Module manufactured by Bently Nevada and used in Machinery Condition Monitoring systems. A half-height, two-channel module called the 3500/25 Enhanced Keyphasor Module transmits Keyphasor signals to the monitor modules in a 3500 rack. 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. An enhanced 3500 system module is called the Enhanced Keyphasor Module. While maintaining full downward compatibility in terms of shape, fit, and function with existing Keyphasor modules for usage in legacy systems, it offers increased Keyphasor signal processing capabilities over the prior design. The revised 149369-01 module totally replaces the Keyphasor module, PWA 125792-01.
Product Introduction
Figure 2: Front and Rear View of 3500/25 Keyphasor module
The 3500 system should use two Keyphasor modules whenever a system Keyphasor input is required for Triple Modular
Redundant (TMR) applications. In this setup, the modules operate in parallel to give the other modules in the rack a
primary and secondary Keyphasor signal. If there are no more than four primary Keyphasor input signals, a system with
more than four Keyphasor inputs may use a paired arrangement.
Two consecutive monitoring locations in either the upper/lower half-slot positions or both half-slot positions are needed
for a paired configuration. Four Keyphasor modules will offer four output channels and accept four primary and four
backup input channels (one per module). It is also feasible to set up three Keyphasor modules, two coupled and one
non-paired.
The user may configure the single unpaired Keyphasor in such a way. The Isolated Keyphasor I/O module is intended for
use in situations where many devices are connected to Keyphasor signals simultaneously and where isolation from other
systems, such as a control system, is necessary.
Despite being designed primarily for Magnetic Pickup applications, the Isolated I/O module is compatible with and will
offer isolation for Proximitor* applications as long as an external power supply is present.
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