| 摘要 |
PURPOSE:To detect trouble rapidly of the titled device by using output by the AND of the output signals of a slip detector and the output signals of a current detector as trouble signals. CONSTITUTION:The output of a rectifier 1 is inputted to the inverter 3 through a DC reactor 2, and an induction motor 4 is driven by the output of the inverter 3. Difference with inverter output frequency 11 is detected in the output of a speed detector 5 connected to the motor 4, and the output of the detector 5 is inputted to a comparator 23. The output of the comparator 23 is inputted at one input terminal of an AND circuit 24 while the output of the current detector 21 mounted at the input side of the rectifier 1 is inputted to a comparator 22 and the output is inputted at the other input terminal of the AND circuit 24. |
