| 摘要 |
PURPOSE:To make it possible to detect the state of equipment with a simple constitution by monitoring the voltage between a commercial power source and one of the change-over contacts that gets the motor to rotate normally and reversely. CONSTITUTION:When a open switch 25 is pressed, first and second relays 18 and 21 are energized and a motor 12 rotates normally. When a close switch 26 is pressed, the second relay 21 only is energized and the motor 12 rotates reversely. If the load is totally opened or totally closed, limit switches 15 and 16 will operate. A photodiode 32a is connected between a commercial power source 14 and an normally open contact 20b of the change-over contacts 20 of the first relay 18. A capacitor 42 is charged and discharged in switching a phototransistor 41 on and off. A comparator 43 compares the voltage of the phototransistor 41 with a set value. Judging from the output of the comparator 43, the loaded condition is detected.
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