| 摘要 |
PURPOSE:To stably and safely continue a previous operating state subsequently even if each selection switch is erroneously operated during an operation of a motor by inhibiting the operation due to the operation of each selection switch during the operation of the motor. CONSTITUTION:Since gates 16a, 26b are closed at the time of operating a motor 4, any of the operating states of switches 14, 15 is not input to an input port 11. Thus, the data of each selection mode stored in an RAM 9 is not updated, a frequency pattern and a voltage pattern are generated subsequently according to previous data to control an inverter 3, thereby operating the motor 4. Thus, even if the switches 14, 15 are erroneously operated during the operation, the control data of the frequency pattern and the voltage pattern for the inverter 3 are not updated, and the motor 4 is controlled to be driven subsequently stably. |
