Title:
WELDING SOURCE
Document Type and Number:
Japanese Patent JP3426342
Kind Code:
B2
Abstract:
PURPOSE: To protect a drive system circuit, a welding head and an article to be welded.
CONSTITUTION: When a line 30a or 30b is disconnected, an OR circuit 24 outputs a signal FB. When the lines 30a, 30b are connected reversely and an output from an amplifier 25 is made larger than voltage Vref1, a comparator 26 outputs a signal FR. When the conditions of welding are not stabilized and an output from a differential amplifier 15 is made larger than voltage Vref2, a comparator 27 outputs a signal CE. When a current value from a buffer 11a is made larger than voltage Vref3, a comparator 28 output a signal IE. When the signals FB, FR, CE, IE are input to a CPU 13a or a current value or a voltage value from an A/D converter 18 is made larger than a threshold, an error message is displayed to an output device 20, and the supply of a welding head 7 with currents is stopped.
Inventors:
Hiroyuki Takasaki
Torii
Torii
Application Number:
JP12251894A
Publication Date:
July 14, 2003
Filing Date:
June 03, 1994
Export Citation:
Assignee:
Nippon Avionics Co., Ltd.
International Classes:
H02H11/00; G05F1/02; H02H7/12; H02M9/00; (IPC1-7): H02H7/12; G05F1/02; H02M9/00
Domestic Patent References:
| JP7266059A | ||||
| JP595146U |
Attorney, Agent or Firm:
Masaki Yamakawa
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