Automatic door switch inspection
First Claim
1. A door switch inspection device for detecting an abnormal condition of a landing door switch used in an elevator, each of a plurality of landing door switches disposed on a corresponding landing door at each of a plurality of landing floors for detecting an open and a closed state of the corresponding landing door, each of the plurality of landing door switches connected in series with each other and with a relay coil of a door switch relay between a power supply and ground, the door switch inspection device comprising:
- a plurality of voltage detection units connected to the ground side of respective landing door switches for detecting a voltage value of their respective landing door switches in the closed state of all the landing door switches; and
a switch contact monitoring unit connected to the plurality of voltage detection units for detecting an abnormal condition of a landing door switch,the switch contact monitoring unit configured to calculate a voltage difference between two voltage values obtained from a landing floor and an adjacent upper floor with respect to all floors, compare the voltage difference with a threshold voltage, and detect the abnormal condition of the landing door switch at the landing floor when the voltage difference exceeds the threshold voltage.
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Accused Products
Abstract
A door switch inspection device for detecting an abnormal condition of a landing door switch used in an elevator is disclosed. Each of a plurality of landing door switches is disposed on a corresponding landing door at each landing floor for detecting an open/closed state of the landing door. The door switch inspection device includes a plurality of voltage detection units connected to the ground side of their respective landing door switches for detecting a voltage value of their respective landing door switches, and a switch contact monitoring unit for detecting an abnormal condition of a landing door switch, which is carried out by calculating a voltage difference between two adjacent floors and comparing the voltage difference with a threshold voltage.
17 Citations
13 Claims
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1. A door switch inspection device for detecting an abnormal condition of a landing door switch used in an elevator, each of a plurality of landing door switches disposed on a corresponding landing door at each of a plurality of landing floors for detecting an open and a closed state of the corresponding landing door, each of the plurality of landing door switches connected in series with each other and with a relay coil of a door switch relay between a power supply and ground, the door switch inspection device comprising:
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a plurality of voltage detection units connected to the ground side of respective landing door switches for detecting a voltage value of their respective landing door switches in the closed state of all the landing door switches; and a switch contact monitoring unit connected to the plurality of voltage detection units for detecting an abnormal condition of a landing door switch, the switch contact monitoring unit configured to calculate a voltage difference between two voltage values obtained from a landing floor and an adjacent upper floor with respect to all floors, compare the voltage difference with a threshold voltage, and detect the abnormal condition of the landing door switch at the landing floor when the voltage difference exceeds the threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of detecting an abnormal condition of a landing door switch for an elevator, each of a plurality of landing door switches disposed on a corresponding landing door at each of a plurality of landing floors for detecting an open and a closed state of the corresponding landing door, each of the plurality of landing door switches connected in series with each other and with a relay coil of a door switch relay between a power supply and ground, the method comprising:
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obtaining a voltage value of each landing door switch with respect to all floors in the closed state of all the landing door switches; calculating a voltage difference between two voltage values obtained from a landing floor and an adjacent upper floor with respect to all floors; comparing the voltage difference with a threshold voltage; and detecting the abnormal condition of the landing door switch at the landing floor when the voltage difference exceeds the threshold voltage. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification