Electric heating – Metal heating – By arc
Patent
1995-12-19
1997-09-09
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219137PS, B23K 9095
Patent
active
056652569
ABSTRACT:
An apparatus and method for detecting phase loss in a cutting or welding system is provided. The apparatus preferably includes a cutting or welding torch and a power source operatively connected to the torch. The power source for a cutting or welding system preferably has a power circuit which includes an electrical input line positioned to receive power from an external power supply, a transformer having a primary side connected to the input line and a secondary side, a rectifier operatively connected to the secondary side of the transformer, and an output line connected to the rectifier. The power source also has a phase loss detector operatively connected to the secondary side of the transformer for detecting phase loss responsive to a ripple voltage exceeding a predetermined threshold. The method of detecting phase loss in a cutting or welding system preferably includes filtering an electrical signal representative of a voltage so that only a ripple voltage passes therethrough, detecting a change in the ripple voltage representative of a phase loss, and communicating the change in ripple voltage representative of a phase loss to an operator of the system.
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ESAB Welding & Cutting Products, Instruction Manual, VI 450 Welding Power Source, F-15-098-A, Mar. 1995.
L-TEC Welding & Cutting Systems, Instructions for L-TEC 450 Welding Power Supply, P/N 678530, F-12-961-B, Oct. 1990.
Shaw Clifford C.
The ESAB Group, Inc.
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