| 摘要 |
PURPOSE:To provide a fault history display method which is necessary for studying the factor of a fault of a variable velocity controller used for a motor. CONSTITUTION:When a fault occurs at a variable velocity control part 5 of a variable velocity controller 30, a fault detecting part 3 detects the fault contents and stores them in a fault history storing part 11 together with the contents of precedent faults as a fault history. When this fault history is displayed, an operation sequence processing part 21 knows a fact that an operation sequence signal group (a) has a specific pattern without using any input signal used exclusively for display of the fault history. Then the fault history is shown at a display part 1. |
