Shaft Eccentricity Measurements with the SKF VM600 Protection System

What is eccentricity monitoring?

Shaft eccentricity is a measurement of the mechanical, thermal or gravity bow of a rotor assembly at slow roll speeds. This bow must be minimized prior to operation of a large machine train to prevent vibration and possible machine damage caused by rotating parts of the rotor assembly contacting stationary parts of the machine case. This contact of rotating and stationary parts is referred to as “radial rub occurrence”.

Eccentricity with the VM600

In the VM600 system, the MPC-4 protection module is the signal-conditioning card used for monitoring eccentricity. The following section provides information regarding the module’s configuration. For
typical eccentricity measurements, the following description should be used in conjunction with the VM600 User Manuals for proper system configuration.