| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent damage of a switching element by heat saturation of a refrigerant of a cooler for cooling the switching element mounted on an inverter device for supplying electric power to an elevator driving motor. <P>SOLUTION: This elevator control device always continuously detects a temperature rise in the switching element 12A by a switching element temperature detector 14 and an ambient temperature detector 15, and predicts a temperature rise value of the switching element 12A based on an output current of the inverter device 12 detected by a current detector 100 by a temperature rise predicting circuit 101. A temperature rise prediction value of these switching elements 12A and a measured value are compared by a temperature difference comparing circuit 102, and when a temperature inclination detecting circuit 103 detects that a variation per unit time of a comparing result in the temperature difference comparing circuit 102 is a preset variation or more, an abnormality detecting circuit 17 detects abnormality of the cooler, and an elevator is stopped on the nearest story by an elevator control microcomputer 13 and a protective operation control circuit 18. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
