Terrance F. Krouth - Eden Prairie MN, US Rongtai Wang - Eden Prairie MN, US Kris Allen Wendorf - Bloomington MN, US
Assignee:
Rosemount Inc. - Eden Prairie MN
International Classification:
H02H 7/00
US Classification:
361 86
Abstract:
A field device detects the presence of terminal leakage between a first terminal and a second terminal in the terminal block area of the field device using a voltage variation ratio that is based on variations in a terminal voltage located across output terminals of a field device and variations in a current regulation voltage located within a current regulation circuit. Preferable, the field device measures an initial voltage variation ratio κand a subsequent voltage variation ratio κ. Based on the initial voltage variation ratio κand the subsequent voltage variation ratio κ, the terminal leakage existing between the first terminal and the second terminal can be calculated.