| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a safer elevator by carrying out a failure diagnosis in an arithmetic device at low cost and with high reliability. <P>SOLUTION: A comparing unit 46 of the arithmetic devices 32 and 37 compares a car speed V1 calculated by using an encoder signal 28 from an encoder 21 with a car speed V2 calculated by using an acceleration sensor signal 31 from, unlike the encoder 21, an acceleration sensor 24 installed on a car 1 to detect a failure of the encoder 21 by determining whether a difference between the car speeds V1 and V2 is present in a predetermined range. <P>COPYRIGHT: (C)2013,JPO&INPIT |
