Brake control apparatus and a method of controlling an elevator brake
AssigneeKone Corporation
InventorAri KATTAINEN
Life of this patent
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Abstract
The invention concerns a brake control apparatus and a method of controlling an elevator brake. The brake control apparatus comprises a first switch and a second switch connected in series with each other for selectively supplying current from a power source to an electrically operated actuator of an elevator brake. The control pole of the first switch and the control pole of the second switch are associated with an elevator safety circuit. The brake control apparatus further comprises a first monitoring circuit configured to indicate operation of the first switch and a second monitoring circuit configured to indicate operation of the second switch.
Claims20
A brake control apparatus, comprising:
- a first switch and a second switch connected in series with each other for selectively supplying current from a power source to an electrically operated actuator of an elevator brake, the control pole of the first switch and the control pole of the second switch being associated with an elevator safety circuit;
- wherein the brake control apparatus comprises:
- a first monitoring circuit configured to indicate operation of the first switch;
- and
- a second monitoring circuit configured to indicate operation of the second switch.
A method of controlling an elevator brake, the method comprising:
- a) causing, responsive to a control signal from a safety circuit, a first switch to close for supplying power from power source to an electrically operated actuator of an elevator brake,
- b) measuring, by a first monitoring circuit, operation of the first switch,
- c) measuring, by a second monitoring circuit, operation of the first switch,
- d) comparing, by a computer, the measuring data received from the first monitoring circuit and the second monitoring circuit to a monitoring criteria, which is valid when a second switch is open.
Dependencies are inferred from the claim text.