| 摘要 |
PROBLEM TO BE SOLVED: To use both a three phase AC and a single phase AC in a control power supply containing an inverter and to safely operate when one phase is lacked. SOLUTION: A current transformer is inserted into one phase of an input side. The power source of an inverter drive signal generating means is formed of the single phase AC including the phase in which the transformer is inserted, and the man circuit input is protected against overcurrent. |
