| 摘要 |
<p>An elevator includes an arithmetic device (32, 37) that incorporates a comparing unit (46) for comparing 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 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, thereby, a failure diagnosis in the arithmetic device is carried out in low cost and high reliability.
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