| 摘要 |
PURPOSE:To reduce the possibility of stopping load feeding by conducting wholly automatically switching of straightforward power feeding to a complete bypass route through an electromagnetic contactor with a self-hold function and by separating a contactless AC switch on the straightforward power supply side from a power line excepting a short period at the time of switching a feeding mode. CONSTITUTION:Switching between a straightforward bypass route and a route passing through an inverter 1 output AC side switch SW1 being one of both AC switches SW1, SW2 for inverter 1 output AC and straightforward AC from a commercial power supply, etc., is automatically conducted by a first electromagnetic contactor MC1 having a self-hold function. With the lapse of a given confirmation period of time after the completion of a switching operation, a straightforward AC side switch SW2 being the other of said both AC switches SW1, SW2 is automatically separated on its input and output sides from its power line by a second electromagnetic contactor MC2 having a self-hold function. |
