公开(公告)号：EP0662701A2

公开(公告)日：1995-07-12

申请号：EP95300152.6

申请日：1995-01-11

Applicant: HONEYWELL INC.

Inventor： Coleman, Mark L. ,  Johnsen, Lyle D. ,  Fletcher, Thomas A.

IPC: H01H9/00 ,  H01H3/16

CPC classification number: G08B21/182 ,  H01H1/0015

Abstract: A monitoring (10) device is provided for use in association with a limit switch or similar mechanically actuated device (16) in order to permit its end of life to be predicted. The system uses nonvolatile random access memory (18) to store a count which represents the number of occurrences of one of two alternative events. The first event is the occurrence of a number of switch actuations and the second event is the lapse of a predetermined period of time. When either of these two events occurs, a microprocessor increments a count in the nonvolatile memory unit and clears both the clock (12) and the volatile memory parameter. When the number stored in the nonvolatile memory represents a number of actuations estimated to be appropriately equal to the total life of the switch, this condition can be signaled to a sensor bus by a communication circuit (22). Alternatively, a light emitting diode can be alternately energized and de-energized to represent the number of actuations having exceeded the predicted end of life total.

Abstract translation: 开关包括用于测量经过时间的装置，响应于开关的致动器的装置，用于记录在预选事件之后的开关的致动次数的第一计数值，用于检测第一次出现的装置 第一计数值等于预选事件之后的经过时间的第一预定量值或经过预选的周期。 该开关还包括用于在第一次出现时复位第一计数值和经过的时间测量装置的装置。 还包括响应于检测装置将第一计数值添加到第二计数值的装置。

公开(公告)号：EP0662701B1

公开(公告)日：1999-10-27

申请号：EP95300152.6

申请日：1995-01-11

Applicant: HONEYWELL INC.

Inventor： Coleman, Mark L. ,  Johnsen, Lyle D. ,  Fletcher, Thomas A.

IPC: H01H9/00 ,  H01H3/16 ,  H01H1/00

CPC classification number: G08B21/182 ,  H01H1/0015

公开(公告)号：EP0662701A3

公开(公告)日：1996-10-30

申请号：EP95300152.6

申请日：1995-01-11

Applicant: HONEYWELL INC.

Inventor： Coleman, Mark L. ,  Johnsen, Lyle D. ,  Fletcher, Thomas A.

IPC: H01H9/00 ,  H01H3/16

CPC classification number: G08B21/182 ,  H01H1/0015

Abstract: A monitoring (10) device is provided for use in association with a limit switch or similar mechanically actuated device (16) in order to permit its end of life to be predicted. The system uses nonvolatile random access memory (18) to store a count which represents the number of occurrences of one of two alternative events. The first event is the occurrence of a number of switch actuations and the second event is the lapse of a predetermined period of time. When either of these two events occurs, a microprocessor increments a count in the nonvolatile memory unit and clears both the clock (12) and the volatile memory parameter. When the number stored in the nonvolatile memory represents a number of actuations estimated to be appropriately equal to the total life of the switch, this condition can be signaled to a sensor bus by a communication circuit (22). Alternatively, a light emitting diode can be alternately energized and de-energized to represent the number of actuations having exceeded the predicted end of life total.