Control circuit for frequency converter

Details Control circuit for frequency converter Control circuit for frequency converter

2007-03-27

2007-03-27

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S090000, C361S091300, C361S187000

Reexamination Certificate

active

10710659

ABSTRACT:
A control circuit for a frequency converter is provided. The control circuit includes a switch circuit, a timer switch, a starter circuit, a starter relay, and a timer relay. The control circuit is capable of keeping the frequency converter on for a predetermined time period when the voltage level of the power supply is below a predetermined voltage level in order to keep the equipment operating. After the lapse of the predetermined period, if the voltage level is still below the predetermined voltage level, the circuit stops to the operation of the equipment to protect the equipment.

REFERENCES:
patent: 3911360 (1975-10-01), Kimzey
patent: 3940664 (1976-02-01), Matsko
patent: 4031463 (1977-06-01), Norberg
patent: 4150310 (1979-04-01), Emile, Jr.
patent: 4306265 (1981-12-01), Kuntner et al.
patent: 4331996 (1982-05-01), Matsko et al.
patent: 5053978 (1991-10-01), Solomon

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