Resistance to ground checker
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United States of America Patent
Stats
-
Jul 7, 1987
Grant Date -
N/A
app pub date -
Nov 12, 1985
filing date -
Nov 12, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit arrangement for monitoring ground faults to a normally ungrounded coil of a motor, the circuit arrangement including; a source of a low-level d.c. voltage, the source having first and second output terminals between which the d.c. voltage is established and a conductive connection being established between the first output terminal and the motor coil; a current responsive unit connected between a point at ground potential relative to the motor coil and the second output terminal of the source for producing an output signal proportional to the amplitude of current flow between the second terminal and ground; and a motor control unit connected for preventing operation of the motor when the output signal from the current responsive means reaches a selected value.
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