| 摘要 |
PURPOSE:To reduce the number of circuit elements, cost and space, by a method wherein an operating condition indicating device, indicating the number of rotation, frequency or the like of the title device, and an input and output signals indicating device are made common. CONSTITUTION:An inverter 1 consists of a control circuit unit 1A and a main circuit unit 1B. The control circuit unit 1A comprises an input interface 3, a CPU 4, processing signals, an output interface 5, a drive signal circuit 6, providing the main circuit unit 1B with drive signals, and a numerical indication device 7, effecting conditional indications. The numerical indication device 7 indicates normally the speed of the title device, however, indicates the condition of an input signal or an output signal when it is necessary. |
