| 摘要 |
PURPOSE:To prevent erroneous trip even upon simultaneous provision of erroneous output signals having same level by providing output signals, with time difference, from a plurality of output ports of a control means upon occurrence of overcurrent. CONSTITUTION:Upon application of power onto a microcomputor 9, the microcomputor 9 performs initialization then reads in an output signal from an A/D converter 8 and stores the output signal in a memory. Furthermore, the microcomputor 9 performs operation for generating a time limit based on the signal stored in the memory and when the operation result has a level required for trip operation, output signal from an output port P00 is brought to low level L and waiting time (t) is provided. Upon elapse of time (t), the microcomputor 9 brings the output signal from an output port P01 to high level H. |
