This paper describes on-line fault detection and diagnosis(FDD) of a refrigeration system. Recently, many refrigerating machines are variable speed vapor compression system using a variable voltage variable frequency(VVVF) inverter. As the values of t...
This paper describes on-line fault detection and diagnosis(FDD) of a refrigeration system. Recently, many refrigerating machines are variable speed vapor compression system using a variable voltage variable frequency(VVVF) inverter. As the values of time constant of temperature and pressure are big comparatively, conventional experiments are difficult to diagnose a fault fast and exactly. So, we propose on-line FDD method using not only temperature and pressure, but also current information about a compressor as the parameters at first. Next, we set up the experimental variable speed system for FDD test. Finally, the proposed method is applied to a FDD of a refrigeration system driven by the induction motor with VVVF inverter to confirm the validity.