Current cut-off arrangement of an elevator

Patent metadata

Field	Value
Publication number	US-11097922-B2
Application number	US-201815969527-A
Country	US
Kind code	B2
Filing date	May 2, 2018
Priority date	May 15, 2017
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

The arrangement comprises a drive driving an electric motor, a contactor and a control circuit connecting a control coil of the contactor to a power supply. The control circuit comprises a manual control part provided with a manually operated first switch, and an electronical control part provided with an electronically operated second switch and a processor controlling the second switch. The first switch and the second switch are connected in series in the control circuit with the power supply and the control coil of the contactor so that de-energization of the control coil of the contactor may be done either by the first switch or by the second switch.

First claim

The invention claimed is:

1. A current cut-off arrangement of an elevator comprises:
a drive for driving an electric hoisting motor,
a contactor having a control coil and being positioned upstream of the drive,
a control circuit connecting the control coil of the contactor to a power supply, said control circuit comprising a manual control part provided with a manually operated first switch, and an electronical control part provided with an electronically operated second switch and a processor controlling the second switch, whereby
the first switch and the second switch are connected in series in the control circuit with the power supply and the control coil of the contactor so that de-energization of the control coil of the contactor may be done either by the first switch or by the second switch,
whereby the elevator further comprises an electronic safety logic comprising a Safe Torque Off logic (STO logic) used to interrupt current supply to the electric hoisting motor and a Safe Brake Control logic (SBC logic) used to close hoisting machinery brakes in a reliable manner.

2. The arrangement according to claim 1 , whereby the contactor comprises an auxiliary contact, the status of the auxiliary contact being used as a feed-back signal indicating the status of the contactor.

3. The arrangement according to claim 1 , whereby the second switch is a contact of a relay, the relay being controlled by the processor.

4. The arrangement according to claim 3 , whereby a power transistor is connected in series with a control coil of the relay, an output of the processor controlling the power transistor and thereby the relay.

5. The arrangement according to claim 1 , whereby the elevator further comprises an Emergency Battery Drive (EBD) unit, a point in the control circuit between the first switch and the control coil of the contactor being connected to an input in the EBD unit in order to transfer the status information of the first switch to the EBD unit, the EBD unit being disabled when the status information of the first switch indicates that the first switch has opened the contactor.

6. The arrangement according to claim 1 , whereby the elevator further comprises an elevator safety controller, a point in the control circuit between the first switch and the control coil of the contactor being connected to an input in an MSC in order to transfer the status information of the manual switch to the MSC.

7. The arrangement according to claim 1 , whereby an auxiliary contact of the contactor is connected to an input in an elevator safety controller in order to transfer a feed-back signal indicating the status of the contactor to an MSC.

8. The arrangement according to claim 6 , whereby the elevator safety controller compares the status of the contactor and the status of the first switch in order to monitor that the status of the contactor follows the status of the first switch.

9. The arrangement according to claim 2 , whereby the second switch is a contact of a relay, the relay being controlled by the processor.

10. The arrangement according to claim 2 , whereby the elevator further comprises an electronic safety logic comprising a Safe Torque Off logic (STO logic) used to interrupt current supply to the electric hoisting motor and a Safe Brake Control logic (SBC logic) used to close hoisting machinery brakes in a reliable manner.

11. The arrangement according to claim 3 , whereby the elevator further comprises an electronic safety logic comprising a Safe Torque Off logic (STO logic) used to interrupt current supply to the electric hoisting motor and a Safe Brake Control logic (SBC logic) used to close hoisting machinery brakes in a reliable manner.

12. The arrangement according to claim 4 , whereby the elevator further comprises an electronic safety logic comprising a Safe Torque Off logic (STO logic) used to interrupt current supply to the electric hoisting motor and a Safe Brake Control logic (SBC logic) used to close hoisting machinery brakes in a reliable manner.

13. The arrangement according to claim 2 , whereby the elevator further comprises an Emergency Battery Drive (EBD) unit, a point in the control circuit between the first switch and the control coil of the contactor being connected to an input in the EBD unit in order to transfer the status information of the first switch to the EBD unit, the EBD unit being disabled when the status information of the first switch indicates that the first switch has opened the contactor.

14. The arrangement according to claim 3 , whereby the elevator further comprises an Emergency Battery Drive (EBD) unit, a point in the control circuit between the first switch and the control coil of the contactor being connected to an input in the EBD unit in order to transfer the status information of the first switch to the EBD unit, the EBD unit being disabled when the status information of the first switch indicates that the first switch has opened the contactor.

15. The arrangement according to claim 4 , whereby the elevator further comprises an Emergency Battery Drive (EBD) unit, a point in the control circuit between the first switch and the control coil of the contactor being connected to an input in the EBD unit in order to transfer the status information of the first switch to the EBD unit, the EBD unit being disabled when the status information of the first switch indicates that the first switch has opened the contactor.

16. The arrangement according to claim 1 , whereby the elevator further comprises an Emergency Battery Drive (EBD) unit, a point in the control circuit between the first switch and the control coil of the contactor being connected to an input in the EBD unit in order to transfer the status information of the first switch to the EBD unit, the EBD unit being disabled when the status information of the first switch indicates that the first switch has opened the contactor.

17. The arrangement according to claim 2 , whereby the elevator further comprises an elevator safety controller, a point in the control circuit between the first switch and the control coil of the contactor being connected to an input in an MSC in order to transfer the status information of the manual switch to the MSC.

18. The arrangement according to claim 3 , whereby the elevator further comprises an elevator safety controller, a point in the control circuit between the first switch and the control coil of the contactor being connected to an input in an MSC in order to transfer the status information of the manual switch to the MSC.

19. The arrangement according to claim 4 , whereby the elevator further comprises an elevator safety controller, a point in the control circuit between the first switch and the control coil of the contactor being connected to an input in an MSC in order to transfer the status information of the manual switch to the MSC.

Assignees

• Kone Corp

Inventors

• Kattainen Ari
• Aitamurto Juha-Matti
• Nikander Juhamatti
• Nakari Arto

Classifications

• B66B1/3423 Primary

  Control system configuration, i.e. lay-out · CPC title

• B66B13/22

  Operation of door or gate contacts · CPC title

• B66B1/32

  effective on braking devices {, e.g. acting on electrically controlled brakes (brake control H02P, lift brakes per se B66B5/02)} · CPC title

• B66B5/0031

  for safety reasons · CPC title

• B66B2201/00

  Aspects of control systems of elevators · CPC title