Method for controlling an elevator
AssigneeKone Corporation
InventorsAlessio Calcagno, Lauri Stolt, Petteri Kangas, Risto Jokinen
Life of this patent
Estimating the term…
Abstract
A method includes commanding a brake controller to open a machinery brake, measuring the brake current of the machinery brake, and when the measured brake current does not meet or exceed a predetermined threshold value within a predetermined time period, then generating a signal indicating failure of the machinery brake and cancelling the elevator run sequence, else executing the elevator run sequence.
Claims17
A method for controlling an elevator provided with a machinery brake and a machinery brake controller controlling the machinery brake, the method comprising the steps of:
- commanding the brake controller to open the machinery brake with a brake open command;
- measuring the brake current of the machinery brake over a predetermined time after the brake open command;
- comparing the measured brake current to a predetermined threshold value;
- and
- when the measured brake current does not meet or exceed the predetermined threshold value within the predetermined time period, then generating a signal indicating failure of the machinery brake and cancelling the elevator run sequence, else executing the next step in the elevator run sequence,
- wherein the machinery brake comprises a first brake and a second brake, the method comprising the steps of:
- commanding the brake controller to open only the first brake;
- measuring the brake current of the first brake;
- and
- when the measured brake current to the first brake meets or exceeds a predetermined threshold within a predetermined time period, then commanding the brake controller to close the first brake and to open the second brake, else commanding the brake controller to close both the first brake and the second brake, aborting the run and issuing a fault code;
- measuring the brake current to the second brake;
- and when the measured brake current to the second brake meets or exceeds the predetermined threshold within the predetermined time period, then commanding the brake controller to open the first brake, else commanding the brake controller to close both the first brake and the second brake, aborting the run and issuing a fault code.
A method for testing an elevator machinery brake comprising a first brake and a second brake, the method comprising the steps of:
- commanding a machinery brake controller to open only the first brake;
- measuring the brake current of the first brake;
- measuring the movement of the elevator;
- when the measured brake current meets or exceeds a predetermined threshold within a predetermined time period and no movement of the elevator is detected, then commanding the machinery brake controller to close both the first brake and the second brake, and indicating a successful passing of the brake test;
- and
- when the measured brake current does not meet or exceed the predetermined threshold in the predetermined time period or if movement of the elevator is detected, then commanding the machinery brake controller to close both the first brake and the second brake, aborting the run, and issuing a fault code.
Dependencies are inferred from the claim text.