| 摘要 |
PURPOSE:To prevent a circuit from being damaged, by taking a protective action, in regarding it as a circuit abnormality when the operation preparation command of an inverter device is issued and the current is detected during the period until an actual operation command is outputted. CONSTITUTION:An inverter control device is composed of an electromagnetic contactor 9 to be put to work in a rescue operation, an inverter device 10, a regeneration resistance 11, a flywheel diode 12, a regenerative transistor 13 and a regeneration circuit control device 16 for the rescue operation. On this occasion, provided are an electromagnetic contactor (NC) 17 to be connected to the regeneration circuit, a current detector (CS) 18 to be added to the DC circuit and an inverter control circuit 19. This inverter control circuit 19 is composed of inverter logical elements 20-21, AND logical elements 22-23, a latch element 24, a light-emitting diode 29, etc. The NC 17 is turned ON and OFF so that the regeneration circuit may be connected to a DC power source 15 only when the operation preparation command is issued. ln commanding the operation preparations, if the current is detected, the inverter control device takes a protective action. |
