| 摘要 |
Elevator brake or other drag is checked by establishing ( 10 - 13 ) baseline motor currents at plural determined positions as the car is moved up and down both empty and with full load. In a normal run ( 21 ), the load is recorded ( 22 ) and the motor current required to drive the load at rated speed at the next determined position is both predicted ( 28 ) and measured. If the difference between the predicted and actual current exceeds a tolerance ( 33, 34 ), the car stops at the next floor ( 35 ), the system is shut down ( 39 ) and a message generated ( 40 ). When the brake is in proper operating condition, baseline motor current required to move a car with the brake engaged is recorded. Thereafter, a high fraction (such as 90%) of baseline motor current is applied to attempt to move the car. If the car moves, the system is shut down ( 101 ) and a message generated ( 102 ).
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