Protection control circuit for a variable speed hoisting device
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United States of America Patent
Stats
-
Apr 26, 1994
Grant Date -
N/A
app pub date -
Aug 25, 1992
filing date -
Aug 30, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A protection control circuit for a variable speed hoisting device driven by an induction motor includes, in addition to the inverter unit 1 for supplying power to the induction motor 2 and relays, a rotary encoder 16 and an abnormality detector 15. When the rotary encoder 16 does not generate output in spite of the fact that an operation instruction is input, the abnormality detector 15 opens the normally closed contact 15b2 to stop the inverter unit 1 and turns on the invertor abnormality display lamp 15d1 and rotation detector abnormality display lamp 15d2.
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