| 摘要 |
PURPOSE:To always stably operate a motor in high efficiency by varying voltage/frequency ratio in response to the detected value of a motor current. CONSTITUTION:A controlling circuit CC receives ON/OFF command from a command switch S1 to start or finish the operation, and operates in accordance with input signals from an automatic/manual circuit S0 and a frequency setter S2, and a motor current feedback signal from a current transformer CT at the automatically operating time, and produces a frequency control signal (F) and a voltage control signal (v) to an inverter INV. The circuit S0 has automatic and manual operation modes by the control, produces an automatic command signal to the circuit CC at the automatically operating time to perform the operation based on the feedback signal from a current transformer CT, and produces any of selected manual set signals A-D to the circuit CC at the manually operating time, thereby performing the operation based on this manually set signal. |
