Excavating
Patent
1989-05-08
1991-09-17
Baker, Stephen M.
Excavating
365229, G11C 1400
Patent
active
050501720
ABSTRACT:
The coil of an electromagnetic contactor is controlled by a microcomputer which stores control data in an internal RAM memory. An integrated circuit chip provides a tightly regulated +5 volt supply voltage to the microcomputer and generates reset signals on power up and power loss. A logic circuit distinguishes a power loss reset from a power up reset and transfers the microcomputer to a STOP mode in which only the RAM is energized to retain the control data. Reserve power to energize the RAM during a power loss of up to several minutes in duration is provided by a large capacitor which is kept charged by the regulated +5 volt supply. Voltage on the capacitor is checked through the integrated circuit on power up to determine if sufficient voltage was maintained to assure the integrity of the RAM.
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Elms Robert T.
Saletta Gary F.
Baker Stephen M.
Moran M. J.
Westinghouse Electric Corp.
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