公开(公告)号：US11480373B2

公开(公告)日：2022-10-25

申请号：US16459432

申请日：2019-07-01

Applicant: Johnson Controls Technology Company

Inventor： Curtis Christian Crane ,  Mark Bodell, II ,  Curtis G. Rager ,  John C. Hansen ,  Dean K. Norbeck

IPC: F25B49/02 ,  H02P29/024 ,  H02P23/00

Abstract: A chiller system includes a compressor, a condenser and an evaporator in fluid communication. A motor drives the compressor. A variable speed drive powers the motor. An oil heater and pump system circulate heated lubricating oil in the compressor. A control panel is arranged to determine whether an input parameter is greater than or equal to a threshold parameter; deactivate the VSD in response to sensing that the input parameter is less than the threshold parameter; determine at least one chiller capacity control parameter at a point when the VSD is deactivated, and maintain the at least one chiller capacity control parameter while the VSD is deactivated; determine that the input parameter has been restored; determine a motor rotation and motor rotational speed; and in response to determining that the input parameter is restored and the motor is rotating in a forward direction, reactivate the VSD.

公开(公告)号：US20190323751A1

公开(公告)日：2019-10-24

申请号：US16459432

申请日：2019-07-01

Applicant: Johnson Controls Technology Company

Inventor： Curtis Christian Crane ,  Mark Bodell, II ,  Curtis G. Rager ,  John C. Hansen ,  Dean K. Norbeck

IPC: F25B49/02

Abstract: A chiller system includes a compressor, a condenser and an evaporator in fluid communication. A motor drives the compressor. A variable speed drive powers the motor. An oil heater and pump system circulate heated lubricating oil in the compressor. A control panel is arranged to determine whether an input parameter is greater than or equal to a threshold parameter; deactivate the VSD in response to sensing that the input parameter is less than the threshold parameter; determine at least one chiller capacity control parameter at a point when the VSD is deactivated, and maintain the at least one chiller capacity control parameter while the VSD is deactivated; determine that the input parameter has been restored; determine a motor rotation and motor rotational speed; and in response to determining that the input parameter is restored and the motor is rotating in a forward direction, reactivate the VSD.

公开(公告)号：US10337781B2

公开(公告)日：2019-07-02

申请号：US14421058

申请日：2013-08-21

Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY

Inventor： Curtis Christian Crane ,  Mark Bodell, II ,  Curtis G. Rager ,  John C. Hansen ,  Dean K. Norbeck

IPC: F25B49/02 ,  H02P29/024 ,  H02P23/00

Abstract: A chiller system includes a compressor, a condenser and an evaporator in fluid communication. A motor drives the compressor. A variable speed drive powers the motor. An oil heater and pump system circulate heated lubricating oil in the compressor. A control panel is arranged to determine whether an input parameter is greater than or equal to a threshold parameter; deactivate the VSD in response to sensing that the input parameter is less than the threshold parameter; determine at least one chiller capacity control parameter at a point when the VSD is deactivated, and maintain the at least one chiller capacity control parameter while the VSD is deactivated; determine that the input parameter has been restored; determine a motor rotation and motor rotational speed; and in response to determining that the input parameter is restored and the motor is rotating in a forward direction, reactivate the VSD.