| 20110240411 | CONTROL CIRCUIT AND CONTROL METHOD OF ELEVATOR BRAKING SYSTEMS - A control circuit and a control method of elevator braking systems are provided. The control circuit comprises a contracting brake signal generating circuit, wherein a door lock relay DJ and a contracting brake contactor ZJ are series connected; a contracting brake signal processing circuit, for converting between high and low level to trigger a braking controller; and an isolation control switch CK jointly connected in the contracting brake signal generating circuit and the contracting brake signal processing circuit. The control circuit and control method of the present invention are used for elevator braking systems to eliminate the adhesion of contacts of contracting brake circuit of elevator braking systems that frequently occurs, thereby preventing the major safety accidents such as the elevator slipping, overrunning or collapsing to the bottom, and, consequently, improving the safety and stability of elevators during operation. | 10-06-2011 |
