| 摘要 |
PROBLEM TO BE SOLVED: To make a simple measure against the fault signals of an output stage by judging a fault only in the case of satisfying at least one different condition in addition to the fault signal and taking the measure. SOLUTION: The output stage 110 converts the control signals of a controller 120 transmitted through conductors 111 and 112 to the different control signals. A monitoring device 105 provided in the output stage 110 sends out the fault signals through the conductor 116 when the fault occurs. The monitoring device 105 monitors where or not a short-circuit between a load 100 and a ground terminal, the short-circuit between the load 100 and a power supply voltage source or the short-circuit between the two connection terminals of the load 100 is generated for instance. The controller 120 inspects where or not chattering time elapses when the fault signals are supplied from the output stage 110. Then, when the signals of the conductor are added longer than a time threshold value determined beforehand, the output stage 110 is interrupted. |
