| 摘要 |
PURPOSE:To enable checking of trouble without impeding an operating function even while an electromagnetic driving circuit is working, by constituting the device so that an actuator driving control signal, to which a false signal of a given frequency is added, will be output, and a trouble will be detected by means of the aforesaid signal and a driving circuit output signal. CONSTITUTION:When a control signal A is input, a wave-shaped driving current inversing the control signal A flows to an electromagnetic actuator 7 via a driving unit 5. The signal is simultaneously transmitted to a trouble cheking device 2 as well. A false signal oscillator 10 transmits a signal B, whose frequency is sufficiently higher than a response frequency of the actuator 7, to an exclusive OR circuit 11 which constitutes an adder 4 and the trouble checking device 2. This causes an output C to be constant when the driving circuit 5 works normally. A device can thus be considered to be detective in the case if other than is described above. |
