ISO 14839-4:2012: a) indicates a typical architecture of an active magnetic bearing (AMB) system so that users can understand which components are likely to comprise such systems and which functions these components provide; b) identifies the primary similarities and differences between AMB systems and conventional mechanical bearings; c) identifies the environmental factors that have significant impact on AMB system performance; d) identifies the operating limitations that are unique to AMB systems and defines standardized methods of assessing these limitations; e) identifies typical mechanisms for managing these limitations, especially rotor unbalance; f) provides considerations for the design and performance of touchdown bearing systems; g) defines a typical signal set for provision in an AMB system for proper system/process interface as well as condition and diagnostic monitoring; h) details current best practices for monitoring, operation and maintenance to achieve highest operational system reliability; i) identifies typical fault-handling practices; j) recommends inspection and preventive maintenance processes for AMB systems.