Fault diagnosis of frequency convert system based on networked virtual instrument

To obtain sufficient fault information and extract important fault characteristics are the key to fault diagnosis. For the core of control unit, some important fault characteristics must be obtained from users' on-site environment. However, at present, there are some problems in the design of virtual instrument which is on-site application-oriented. For example, the on-site resources often can not meet the requirements of fault diagnosis; sufficient knowledge in the application field and design ability of software and hardware must be obtained by the software designers. Based on the fault diagnosis of frequency convert system, this paper put forward a design method of networked virtual instrument which is on-site application-oriented. Remote resource is called by Internet technology, and networked virtual instrument is constructed in the case of insufficient on-site resource. Requirement design, resource calling and data management are relatively independent of flow and flow assembling, resource and resource matching, data dictionary and data image. Design process of networked virtual instrument is simplified.