针对原等离子切割机存在的起弧困难和小弧到大弧的转移不连续的缺点，对原控制装置硬件结构和控制线路进行技术改造，使用结果表明：该装置运行可靠，起弧容易，控制效果好，并且提高了生产效率。
The author discusses the faults of the existing plasma cutting machine, difficulty to start arc and to transit from minarc to maxarc, then puts forward a new control scheme based on technical desires.
能与各品牌产品互换，使弧型门产品保持原高性能，而价格大幅度降低。
Can exchange with the brand products, so that arc type door products to maintain the original high performance, and the price is greatly reduced.
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