Elevator controller
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United States of America Patent
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Jul 15, 2008
Grant Date -
Feb 8, 2007
app pub date -
May 24, 2004
filing date -
May 24, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In an elevator control apparatus, a power supply voltage monitoring circuit monitors a power supply voltage supplied to a processing portion. A voltage monitoring soundness checking function circuit outputs a monitoring input voltage forcible change signal for forcibly changing a power supply voltage input to the power supply voltage monitoring circuit in response to a control signal from the processing portion. A voltage abnormality detection signal from the power supply voltage monitoring circuit is input to the voltage monitoring soundness checking function circuit. The processing portion checks the soundness of the power supply voltage monitoring circuit by reading data held by the voltage monitoring soundness checking function circuit.
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