EMERSON A6110 Shaft Relative Vibration Monitor

EMERSON A6110 Shaft Relative Vibration Monitor

The Shaft Relative Vibration Monitor is designed to provide extreme reliability for your plant's most critical rotating machinery. This 1-slot monitor is used with other AMS 6500 monitors to build a complete API 670 machinery protection monitor.
Applications include steam, gas, compressor and hydro turbine machinery.

The main function of the shaft relative vibration monitoring module is to accurately monitor the shaft relative vibration and reliably protect the machinery by comparing the vibration parameters with the alarm set points, driving alarms and relays.

Shaft relative vibration monitoring consists of a displacement sensor either mounted through the bearing case, or mounted internally on the bearing housing, with the rotating shaft being the target.

The displacement sensor is a non-contact sensor measuring shaft position and movement. Since the displacement sensor is mounted to the bearing, the monitored parameter is said to be shaft relative vibration, that is, shaft vibration relative to the bearing case.

Shaft relative vibration is an important measurement on all sleeve bearing machines for predictive and protection monitoring. Shaft relative vibration should be selected when the machine case is massive as compared with the rotor, and the bearing case is not expected to vibrate between zero and production-state machine speeds. Shaft absolute is sometimes selected when the bearing case and rotor mass are more closely equal, where it is more likely that the bearing case will vibrate and impact shaft relative readings.

The AMS 6500 is an integral part of PlantWeb and AMS software. PlantWeb provides operations integrated machinery health combined with the Ovation and DeltaV process control system. AMS software provides maintenance personnel advanced predictive and performance diagnostic tools to confidently and accurately determine machine malfunctions early.