Ncr Corporation

Myron A Nesdahl

Hilding E Nelson

Marvin L Gallati

A redundant modular power supply having a plurality of modules including a redundant module is disclosed which includes an apparatus for testing for a fault in any of the modules of the power supply. The redundant module is provided with a margin terminal, which when receiving a command from the testing apparatus, causes the redundant module to output current. The testing apparatus periodically issues such commands to the redundant module, monitors the output of the redundant module, and indicates an error condition if the redundant module does not respond properly to the commands from the testing apparatus. If the redundant module outputs current when not commanded to do so, a failure of one of the other modules in the power supply is indicated. If the redundant module fails to output current when commanded to do so, a failure of the redundant module is indicated.

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Coon Rapids, MN, United States of America

Myron A Nesdahl