| 摘要 |
PURPOSE:To ensure the continuation of operation at the time of instantaneous interruption by conducting regeneratice control in response to load currents immediately before momentary service interruption. CONSTITUTION:When momentary service interruption occurs and DC voltage Ed reaches a specified value or less, an output from a comparator 13 is inverted. The frequency of an inverter body 4 is brought to the regenerative side by applying a - V signal to a speed control amplifier 8 by a logic circuit 12 while an output from a limiter circuit 11 is held at a value immediately before momentary series interruption, a value corresponding to load currents immediately before momentary service interruption. An output from the speed control amplifier 8 is limited with a limiter value corresponding to load currents by the output from the limiter circuit 11, and DC voltage Ed is kept constant by limiting the quantity of regenerative currents. |
