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US 8,552,738 B2Granted
Device for checking a safety circuit of an elevator
AssigneeInventio AG
InventorDaniel Quinn
Life of this patent
Estimating the term…
Abstract
A testing device for checking a safety circuit of an elevator apparatus includes at least one hardware-monitoring unit for monitoring at least one functionally relevant composite resistor in the safety circuit.
Claims11
A testing device for the purpose of checking an elevator apparatus of an elevator, wherein the testing device comprises:
- at least one hardware-monitoring unit for monitoring at least one functionally relevant composite resistance value in the elevator apparatus;
- wherein said at least one hardware-monitoring unit contains at least one sensing unit which comprises at least one of a current-measuring unit, a voltage-measuring unit and a resistance-measuring unit;
- and
- wherein the testing device detects a functionally hazardous increase in on-state resistance-values of electric output-switching elements of sensors of a safety circuit of the elevator, said output-switching elements forming said composite resistance value, and wherein said at least one hardware-monitoring unit has at least one output unit for emitting at least one signal representing a need for maintenance in response to the detection of the functionally hazardous increase.
1 more element
An elevator apparatus with a testing device and at least one safety circuit having at least two sensors with output-switching elements the output-switching elements being series-connected and the testing device comprising:
- at least one hardware-monitoring unit which in at least one operating mode monitors at least one functionally relevant condition of at least one hardware component of the safety circuit;
- wherein said at least one hardware-monitoring unit contains at least one sensing unit which comprises at least one of a current-measuring unit, a voltage-measuring unit and a resistance-measuring unit;
- and
- wherein the testing device detects a functionally hazardous increase in on-state resistance-values of the series-connected output-switching elements of the sensors of the safety circuit of the elevator, and said at least one hardware-monitoring unit has at least one output unit for emitting at least one signal representing a need for maintenance in response to the detection of the functionally hazardous increase.
1 more element
A hardware-monitoring method using a testing device comprising the steps of:
- a. providing a hardware-monitoring unit in the testing device;
- b. monitoring a relevant composite resistance value of a safety circuit of an elevator control with the hardware-monitoring unit by detecting a functionally hazardous increase in on-state resistance-values of series-connected output-switching elements of the sensors of the safety circuit of the elevator, the output-switching elements forming the composite resistance value;
- and
- c. emitting from the hardware-monitoring unit at least one signal representing a need for maintenance in response to the detection of the functionally hazardous increase.
1 more element
Dependencies are inferred from the claim text.