| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the cost by decreasing the laying quantity and laying man- hour of a cable and eliminating the need to lay another circuit for an auxiliary relay switch. SOLUTION: Limit switches 11, 12, 13, 14, 15, and 16 (abnormality detection switch) which make contacts when abnormality is detected are installed at difference places and connected to a power source 4 in parallel through electric resistances 11A, 12A, 13A, 14A, 15A, and 16A which have mutually different natural resistance values set; and an ammeter 18 (current detecting means) is provided which detects a current value when electrification is carried out with the contact of one limit switch made and which of limit switch makes its contact is decided according to the current value detected by the ammeter 18.</p> |
