Protection control circuit for a variable speed hoisting device

Details Protection control circuit for a variable speed hoisting device Protection control circuit for a variable speed hoisting device

1992-08-25

1994-04-26

Roskoski, Bernard

Electricity: motive power systems

Induction motor systems

Primary circuit control

318799, 318461, 361 23, 361 88, H02H 708

Patent

active

053069986

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.

REFERENCES:
patent: 3971971 (1976-07-01), Wycoff
patent: 4292577 (1981-09-01), Cesarz et al.
patent: 4546293 (1985-10-01), Peterson et al.
patent: 4953053 (1990-08-01), Pratt
patent: 4965847 (1990-10-01), Jurkowski et al.

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