| 摘要 |
<p>PURPOSE:To permit an operator to know the replacement time of an exciting coil and to simplify maintenance management by displaying the remaining service life of the exciting coil on a display device. CONSTITUTION:A temperature detection means 24 detecting the temperature of an exciting coil 5b and a time detection means 22 detecting the operating time of the exciting coil 5b are provided. A logic calculation circuit 13 calculates the service life of the exciting coil 5b based on the preset coil temperature based on the coil temperature detected with a life calculation program, corrects the service life based on the operating time of the exciting coil 5b, predicting the remaining life and displays the prediction result on a display device 21.</p> |
