FAILURE DETECTING DEVICE FOR ELEVATOR DRIVE POWER SOURCE AND FAILURE DETECTING METHOD FOR ELEVATOR DRIVE POWER SOURCE

摘要

In a feeder circuit for operating a safety device of an elevator,a charging capacitor for actuating an actuator through dischargeis employed. A failure detecting device for detecting the presenceor absence of a capacitance shortage of a charging capacitor isalso electrically connected to the feeder circuit. The failuredetecting device has a memory in which a lower limit and upper limitof a charging time at the time when the charging capacitor is innormal operation are stored, and a CPU which is capable of measuringthe charging time of the charging capacitor and detects whetheror not the charging time is between the lower limit and the upperlimit. When the charging time is between the lower limit and theupper limit, the CPU determines that there is no capacitance shortageof the charging capacitor.