| 摘要 |
PURPOSE: To detect defective connection of a connector to which a current transformer for detecting a circuit current is connected. CONSTITUTION: Secondary side terminals 9a, 9b of a current transformer 9 are connected to connection terminals 20b, 20c of a connector 20. Voltage, obtained by full-wave rectifying a secondary current of the current transformer 9 by diodes D1 to D4 , is input to a negative input terminal- of a comparator 22. A DC power supply E is input to a positive input terminal+ of the comparator 22 through a series circuit of a connection terminal 20a, short-circuit line 21 and a connection terminal 20d. The comparator 22 outputs defective connection detecting signal #NG when the voltage obtained by full-wave rectification is increased to reference voltage Vref or more. |
