| 摘要 |
PURPOSE: To detect a trouble quickly and stop operation of a power circuit which has the trouble before it is seriously damaged by providing a system with a current value setting circuit and a power supply trouble judging circuit for calculating an allowable current per one power circuit from the total current value and comparing the value with the output current of each power circuit and then stopping by force a power circuit which has a trouble. CONSTITUTION: An attenuator 19 outputs an upper limit value of an allowable current per one power circuit and an attenuator 20 outputs a lower limit value. A comparator 22 compares an output current value of a power circuit 14 with the upper limit value of an allowable current. A comparator 23 compares the output current value of the power circuit 14 with the lower limit value. When the comparator 23 determines that the power circuit 14 has a trouble, it outputs a signal to an OR circuit 24. When the OR circuit 24 determines that the power circuit 14 has a trouble, it turns a relay circuit 2 off. A trouble power supply displaying circuit 26 displays which power circuit has a trouble. Just at a time when the output current value exceeds the allowable range, it is determined that the power circuit 14 has a trouble and then the operation of the power circuit 14 is stopped immediately after a trouble is detected. |
