| 摘要 |
PURPOSE:To realize counting easily by a relay circuit of an electromechanical system by receiving and detecting inverted dial pulses alternately by a directional current detecting circuit and then by counting the release sequence of relays of the electromechanical system by a counting circuit on the basis of the result of the reception and detection. CONSTITUTION:Inverted dial pulses are received and detected by a relay for pulse current detection and its contacts X and Y, and (x) and (y). According to the reception and detection of those dial pulses, position relay C is put into operation during pulse arrival and the release sequence is counted by counting relays and their contacts PA-PG, and Pa1-Pa3, Pb1-Pb3, Pc1, Pc2, Pd1, Pd2, Pe1, Pe2, Pf1, Pf2, and Pg1. On the ending of a string of dial pulses, patterns of operation and release states of respective counting relays PA-PG are made to correspond to the number of received pulses, so that the reception and counting of alternately inverted dial pulse will be realized by the relay circuit of the electromechanical system. |
