Bently Nevada 3500/25 Keyphasor I/O Module 3500-25

Bently Nevada 3500/25 Keyphasor I/O Module Transient Data Interface (TDI) is the interface between the 3500/22M monitoring System and Bently Nevada System 1TM mechanical management software. Common models: 3500/22-01-01-00.3500/25-01-05-00.3500/25-01-02-00

SPECIFICATIONS

Part Number: 3500/25

Manufacturer: Bently Nevada

Series: 3500

Product Type: Keyphasor Module

Product Description:

Bently Nevada created the 3500/25 Enhanced Keyphasor Module. It’s a half-height, two-channel module that sends Keyphasor signals to monitor modules in a 3500 rack. When the Keyphasor mark on the shaft aligns with the Keyphasor transducer, the module uses magnetic pickups or proximity probes to detect the alignment and transforms the input signals into digital Keyphasor signals.

3500/25 Functional Description

The 3500 Machinery Protection System can take up to four Keyphasor signals for ordinary setup and up to eight for paired configuration.

A keyphasor signal, which is produced by a rotating shaft or gear once per turn or several times per turn, can be used to precisely detect timing.

As a consequence, 3500 monitor modules and external diagnostic tools can evaluate shaft rotative speed and vector properties such as 1X vibration amplitude and Phase.

Enhanced Keyphasor Module

The Upgraded Keyphasor Module is a 3500 system module that has been enhanced. While retaining complete downward compatibility in terms of shape, fit, and function with current Keyphasor modules for use in legacy systems, it provides enhanced Keyphasor signal processing capabilities over the previous design. The updated 149369-01 module completely replaces the PWA 125792-01 Keyphasor module.

When a system Keyphasor input is required for Triple Modular Redundant (TMR) applications, the 3500 system should employ two Keyphasor modules. In this configuration, the modules work in simultaneously to provide a primary and secondary Keyphasor signal to the other modules in the rack.

A system with more than four primary Keyphasor input signals may employ a paired configuration if there are no more than four primary Keyphasor input signals.

3500/25 Operation

A paired arrangement requires two successive monitoring sites in either the upper/lower half-slot positions or both half-slot positions. Four Keyphasor modules will provide four output channels and four input channels (four primary and four backup) (one per module).

It is also possible to set up three Keyphasor modules, two of which are connected and one of which is not. The single unpaired Keyphasor can be configured in this manner by the user (order either two 2-channel or one 1-channel and one 2- channel option)

Isolated Keyphasor I/O module

The Isolated Keyphasor I/O module is intended for usage in scenarios where multiple devices are concurrently linked to Keyphasor signals and separation from other systems, such as a control system, is required.

Despite being built primarily for Magnetic Pickup applications, the Isolated I/O module is compatible with and will provide isolation for Proximitor* applications if an external power source is available.

The major purpose of this I/O module was to measure shaft speed rather than phase. The module may offer phase measurements, albeit it introduces a somewhat higher phase shift when compared to the Non-Isolated I/O version. Product enhancements include the generation of once-per-turn event signals from multievent-per-turn inputs, field-upgradable firmware, and asset management data reporting.

Input Signal Specifications

Each Keyphasor Module can receive up to two transducer signals from magnetic pickups or proximity probe transducers. The input signal range for non-isolated I/O modules is +0.8 V to 21.0 V, whereas isolated I/O modules have a range of +5 V to -11 V.

Signals that fall outside of this range are internally limited by the module. Passive magnetic pickups require a shaft rotating speed of more than 200 rpm (3.3 Hz). Each Keyphasor Module can receive up to two transducer signals from magnetic pickups or proximity probe transducers. The input signal range for non-isolated I/O modules is +0.8 V to 21.0 V, whereas isolated I/O modules have a range of +5 V to -11 V.

Signals that fall outside of this range are internally limited by the module. Passive magnetic pickups require a shaft rotating speed of more than 200 rpm (3.3 Hz).