On-line monitoring of controllers in an environment control netw

Details On-line monitoring of controllers in an environment control netw On-line monitoring of controllers in an environment control netw

1994-12-20

1997-10-28

Voeltz, Emanuel T.

Boots, shoes, and leggings

364510, 364581, 236 495, 62 93, 62126, 165 16, G01F 106

Patent

active

056823290

ABSTRACT:
The present invention relates to a diagnostic system for use in a network control system. The diagnostic system is preferably utilized to analyze HVAC system or VAV box performance in an environmental control system such as a network facilities management system. The diagnostic system advantageously records temperature, air flow, and actuator position data in the controller associated with the VAV box and calculates an exponentially weighted moving average value. The exponentially weighted moving average value may be related to error values, process output values, change in actuator position, actuator position, duty cycle of the actuator, or starts, stops and reversals of the actuator. Such a system allows a person to analyze VAV boxes and controller performance over a particular timely period and the lifetime of the system. Box and damper warnings may be provided by the diagnostic system when the EWMA values are over or under particular threshold values. The EWMA values are advantageously calculated and stored in the individual controllers.

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Spoerre; Juliek., "Machine Performance monitoring and fault classification using an Expontially Weighted Moving Aveg. Scheme, Thesis", May 1993.

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