Digital controller

Details Digital controller Digital controller

2011-01-11

2011-01-11

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

Reexamination Certificate

active

07869172

ABSTRACT:
An input processing unit of safe digital controller includes units for determining ground when a voltage V from an input terminal is equal to or lower than a ground determination value; for outputting a first specified value regardless of the voltage V during a first given period immediately after the controller starts; for outputting a value based on the voltage V when the voltage V is equal to or higher than the ground fault determination value and equal to or lower than a disconnection determination value after the first given period, outputting a third specified value during a second given period after the first given period when the voltage V is lower than the ground fault determination value, and outputting the first specified value when a state in which the voltage V is lower than the ground fault determination value is maintained for the second given period or longer; and for outputting a second specified value during the second given period when the voltage V is higher than the disconnection determination value after the first given period, and outputting the first specified value when a state in which the voltage V is higher than the disconnection determination value is maintained for the second given period or longer.

REFERENCES:
patent: 5638057 (1997-06-01), Williams
patent: 5872457 (1999-02-01), Williams
patent: 6888708 (2005-05-01), Brungs et al.
patent: 08-338296 (1996-12-01), None

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