| 摘要 |
PURPOSE:To detect troubles of pulse signals and the wiring in a unit by constituting a PG check circuit by logical operation elements in the trouble diagnostic equipment for the control unit including a pulse generator PG. CONSTITUTION:Pulse signal A, B and C phases are inputted from terminals 100, 101 and 102, and the disturbance of the aignal sequence of A and B phases is stored through differentiating circuit 103 in FF circuits 105 and 106 to generate an alarm signal. The disturbance caused by the wiring system and signals of pulse drop-out, noise, etc., is discriminated by shift register 108 and AND circuits 120 and 121; and when a PG check start command is given to terminal 126, register clock signal CK is generated from AND circuit 119, and troubles of disconnection, ground, and shortcircuit between A and B phases are detected as the output alarm signal of FF circuits 112, 113 and 114 by output signal FULL of counter 10. Normalcy of origin pulses is decided by feedback pulse processing circuit 110, counter 111 and coincidence circuit 112. |
