The integrated electronic control system will provide a new method for the day-to-day management of environmental control of animal production systems. No standards are currently accepted for transient overvoltage protection of these controllers. To assess the adequacy of existing designs, a test circuit was designed and used for a transient open circuit over-voltage waveform (ANSI/IEEE C62.41-1980) of 16 environmental control units: a maximum spike of 770 V was applied to the power supplies, and a spike up to 100 V was applied to temperature sensor lines. For these relatively mild tests, no failures were noted due to power supply transients, but three units failed when subjected to transients on their temperature sensor lines. From this research it is suggested that an industry standard be adopted to define the minimum transient overvoltage design conditions by which environmental controllers should be tested.

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Published in Transactions of the ASAE, v. 35, issue 2, p. 727-733.

© 1992 American Society of Agricultural Engineers

The copyright holder has granted the permission for posting the article here.

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We also thank Mr. Kenneth McFate of the National Food and Energy Council for his assistance in the administration of the grant which partially supported this research.

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The investigation reported in this article (No. 91-2-94) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.