Apparatus for detecting abnormality of relay

Details Apparatus for detecting abnormality of relay Apparatus for detecting abnormality of relay

2006-05-02

2006-05-02

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

C361S029000

Reexamination Certificate

active

07038895

ABSTRACT:
An abnormality detection apparatus, which reduces erroneous detection of an open abnormality of a relay, includes a microcomputer that activates the relay and determines whether the output voltage of the relay is less than a threshold value. When the output voltage is less than the threshold value, the microcomputer repeats the activation of the relay and the determination. The detection unit detects the occurrence of an open abnormality when the repetition number exceeds two.

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