Model-Based, Detailed Fault Analysis in the
CERN PS Complex Equipment

G. Benincasa, M. Beharrell, J.M. Bouche,
J. Cuperus, L. Merard
PS/CO Group, CERN Switzerland

In the CERN PS Complex of accelerators, about a thousand pieces of equipment of various types (power converters, RF cavities, beam measurement devices, vacuum systems, etc.) are controlled by the so-called Control Protocol, already described in previous conferences. This protocol, a model based equipment access standard, provides, amongst other facilities, a uniform and structured fault description and report feature. The faults are organized in categories, following their gravity, and are presented at two levels: the first level is global and identical for all devices, the second level is very detailed and adapted to the peculiarities of each single device. All the relevant information is provided by the equipment specialists and is appropriately stored in static and real time data bases; in this way a unique set of data driven application programs can always cope with existing and newly added equipment. Two classes of applications have been implemented, the first is intended for control room alarm purposes, and the second is oriented for specialist diagnostics. The system is completed by a fault history report facility permitting easy retrieval of previous faults which occurred, for example, during the night.