| 摘要 |
PURPOSE:To enhance a reliability, by a method wherein at the occurrence of a trouble caused by interlock switches the cause can be rapidly specified. CONSTITUTION:A voltage at a point T to be fed from a power source unit 80 to a main motor driver 81, a high-tension power source 82, and a light source driver 83 through interlock switches SW2, SW4, SW6 of a DC 24V power line 84 is inputted to a voltage detection circuit 30. A collector of a transistor 31 is connected to an input terminal of a sequence control part 71 to output a condition detection signal INTDN according to the voltage at the point T to the sequence control part 71. If the interlock switches SW2, SW4, SW6 remain OFF by a conduction failure and the voltage of the power line 84 is lowered to a threshold or under, then the signal INTDN outputted from the voltage detection circuit 30 turns to 'L' to inform the occurrence of an interlock switch abnormality to the sequence control part 71. |
