Emerson 3A99158G01

Author: zhddq

Published on: 2025-11-26

the Emerson 3A99158G01 is actually an Input/Output (I/O) module for turbine monitoring systems, not specifically a communication card . Its primary functions are to interface with sensors, process signals, and provide monitoring and alarm outputs for machinery protection.

Here is a summary of its key functions:

Function	Description
Signal Input	Accepts input from two independent sensor channels (supports both eddy current sensors like epro PR6423+CON021 and Hall-effect sensors like PR9376). Input voltage range is 0 to -27.3 V DC .
Sensor Power Supply	Provides two isolated -26.75 V DC power sources for the sensors .
Signal Output	• TTL Pulse Outputs: Two channels, 0 to +5V, matching sensor signal frequency/pulse width . • Keyphasor Outputs: Two channels, up to 24V, for speed, timing, and position reference . • Current Outputs: Two channels of 0/4-20 mA signals representing speed .
Limit Monitoring & Alarm Relays	Provides four independent alarm outputs. Configurable for various conditions like "Rising Overspeed," "Falling Overspeed," "Barring," "Difference Speed," or "Rotation Direction"

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Emerson 3A99158G01

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