Elevator system

Elevator system, which comprises at least one elevator car (7), which elevator car is supported at least partially by means of elevator ropes (9), elevator ropes (9), a traction sheave (6) for moving the elevator car (7) via the elevator ropes (9), an elevator motor (5), and at least two holding brakes (106, 107) per elevator car, which holding brakes (106, 107) are arranged to prevent the elevator car (7) from moving when the elevator is stopped, characterized in that the elevator system further comprises

• means (2) for controlling the holding brakes of the elevator, with which means
• i. one of the holding brakes (106, 107) can be controlled to close immediately at the end of an elevator run, and
• ii. the other holding brakes (106, 107) can be controlled closed with the desired delay
• means (3) for monitoring slipping of the brake of the elevator
• means for performing a procedure intended to prevent a hazardous situation, in which the first holding brake is engaged when the brake is detected as slipping

Safety device (1 13) for improving operating safety in an elevator system, which elevator system comprises an elevator car, which elevator car is supported at least partially by means of elevator ropes, elevator ropes, a traction sheave for moving the elevator car via the elevator ropes and an elevator motor, a sensor (109) for measuring the speed of rotation of the elevator motor, a sensor

• (108) for monitoring the temperature of the motor and means (100) for disconnecting the electrical power supply of the motor in a situation where the motor overheats, and at least two electromagnetic holding brakes (106, 107), which holding brakes are arranged to prevent movement of the elevator car when the elevator is stopped, and means (100) for closing the holding brakes at the end of an elevator run, and which safety device can be fitted as a part of the elevator system, characterized in that the safety device comprises
• means (104) for delaying engagement of the second holding brake
• a slip status monitoring unit (102), which comprises means for monitoring the state of motion of the elevator and for detecting a slipping situation
• means for preventing starting of the motor if the brake is slipping when the first holding brake is engaged