Diagnostics And User Interface

Diagnostic Capabilities The controller, in order to function, must analyze a continuous stream of information on the shaft location in each of the five control axes, two for each radial bearing and one for the thrust bearing. This information can be accessed for external diagnostic use, as can the corresponding information on bearing current, from which can be inferred the bearing load. This diagnostic information can be a very useful source of information on the health of the pump, its mechanical components, and on the system it is operating in.

Interface Requirements The magnetic bearing system controller can also be interfaced with the plant control system with the following type of logic:

• No drive unit start without levitation

• No delevitation at speed

• Rotor offset and bearing load alarms

• Rotor offset and bearing load driver trips, with possible time delay

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