EMERSON A6312/06 Speed and Key Monitor Specification

EMERSON A6312/06 Speed and Key Monitor Specifications

The Speed and Key Monitor is designed for high reliability for the plant’s most critical rotating machinery monitoring speed, phase, zero speed and direction of rotation.This 1-slot monitor is used together with the AMS 6500 monitors to build a complete API 670 machinery protection monitor. Applications include steam, gas, compressors and hydro turbo machinery.

The Speed ​​and Key Monitor can be configured in redundant mode to automatically switch from the primary to the backup tachometer. Sensor gap voltage and pulse count/compare are monitored to trigger the switchover. When the Speed ​​and Key Monitor is operated in redundant mode, the primary sensor and failover key or speed displacement sensor must be mounted in the same shaft plane to ensure phase continuity in case of failover.

Speed ​​measurement consists of a displacement sensor mounted inside the machine, with the target being a gear, keyway or gear rotating on a shaft. The purpose of speed measurement is to sound an alarm at zero speed, monitor reverse rotation and provide speed measurement to track process conditions for advanced analysis. Key or phase measurement also consists of a displacement sensor, but must have a once per revolution target rather than a gear or cog as the target. Phase measurement is a critical parameter when looking for changes in machine health.

AMS 6500 is an integral part of PlantWeb® and AMS software. PlantWeb, combined with Ovation® and DeltaV™ process control systems, provides integrated machinery health operations. AMS software provides maintenance personnel with advanced predictive and performance diagnostic tools to confidently and accurately identify machine failures early.