Fault Diagnosis of Paper Winders, 2000 Process Control, Electrical & Info. Conference Proceedings

Timo Virtanen, Jari Paanasalo--Modern paper winders have over 500 actuators and 1500 I/O-points. The complex structure of a winder and its control software also requires new kinds of diagnostic methods. With a modern fault diagnosis system the operator can quickly and accurately identify the cause of a fault. There are several different methods and tools that can be used to effectively assist the user in identification and correction of problem situations.

Modern fault diagnosis systems continue to be based on a reliable fault detection system which generates alarms from errors such as broken actuators. The diagnostic system must also clearly indicate the cause of system shutdown should a given function cease to operate. A traditional alarm message is one way to show this kind of information but more advanced graphical user interfaces provide the operator with better diagnostic information.

The most powerful diagnostic systems constantly monitor the operation of the winder and display the current control logic and winder state in various graphical forms such as logic displays and a digital oscilloscope. It is also important to link together different parts of fault diagnostics systems as well as other systems such as online user documentation. This paper demonstrates various methods to find and show fault information to help operators and maintenance professionals handle machine problem situations.