| 摘要 |
PURPOSE:To enhance the economical efficiency and the integration degree of the apparatus by a method wherein a rotational-direction display device for an induction motor is used also as a decimal-point display part for a digital display device indicating the output frequency of an inverter. CONSTITUTION:When a display device (a light-emitting diode) 51 indicating the rotational direction of an induction motor is used also as a decimal-point display part for a digital display device 50 indicating the output frequency of an inverter, a light-emitting diode exclusively used for the rotational direction can be omitted. When the induction motor is being turned forward, a decimal point on the digital display device 50 is lit. When it is being turned reversely, the decimal point blinks at definite intervals. Thereby, a forward rotation and a reverse rotation are displayed, and the operating state of the inverter is displayed. |
