Current limit system and method for electrical discharge machining apparatus
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United States of America Patent
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Jul 17, 1984
Grant Date -
N/A
app pub date -
May 17, 1982
filing date -
May 17, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A programmable system for controlling maximum machining current. A current limit is entered into the system together with the on-time and off-time desired. The system operates to use the desired on-time and current values, but the off-time will be modified depending on the maximum current limit possible. This will protect the apparatus when an impossible combination has been entered by the operator. Minimum allowable period is calculated for any desired current limit. The desired period is subtracted from the minimum period and the difference added to the off-time if the result is positive.
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