Relay unit, control method for relay unit
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United States of America Patent
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Apr 24, 2018
Grant Date -
Aug 4, 2016
app pub date -
Oct 13, 2015
filing date -
Feb 2, 2015
priority date (Note) -
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Abstract
The reliability of testing a normally closed contact in a relay unit may involve the following. While the load is de-energized, sending a test signal to a normally closed contact (b1, b2) and detecting the state of the returning test signal sent. Resending a test signal when a detection result does not satisfy a predetermined criteria, and re-detecting the state of the returning test signal resent. The state of the returning test signal resent may be assessed as normal when the re-detection result satisfies the predetermined criteria.
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