Fault detector system for starting plasma arc working apparatus

Details Fault detector system for starting plasma arc working apparatus Fault detector system for starting plasma arc working apparatus

1976-03-31

1977-07-12

Truhe, J. V.

Electric heating

Metal heating

By arc

315133, B23K 910

Patent

active

040356035

ABSTRACT:
A fault detector system which is capable of monitoring certain key parameters in the starting operation of a plasma arc working apparatus and which can automatically stop the starting operation once a fault or malfunction has been detected. The system includes means for sensing the input signal to a high frequency AC generator, the pilot arc current once the pilot arc has been ignited and the arc voltage after the main arc has been established. The sensing means produce signals representing the presence of these starting parameters which signals are then fed to conventional timers. The timers measure the duration of the signals or combination of signals such that if a fault or malfunction occurs and lasts for a predetermined time period, the timers produce output signals which are then fed to logic circuits. The logic circuits in turn produce output signals which represent the fault or malfunction. These output signals are fed to storage devices which hold the signals and activate switch means for automatically stopping the starting operation of the apparatus. Preferably, the system also includes means for visually indicating that a fault or malfunction has occurred and also for indicating the type and nature of the fault or malfunction.

REFERENCES:
patent: 3745321 (1973-07-01), Shapiro et al.
patent: 3748537 (1973-07-01), Vigini
patent: 3838242 (1974-09-01), Goucher
patent: 3914575 (1975-10-01), Eicher

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