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How there has second DC injection function? What machines need this function? How is the advantage of this?

Goals and Symptoms

How there has second DC injection function? What machines need this function? How is the advantage of this?

Causes and Fixes

You can use this function if your doesn't support a high level current in DC injection ( or for a long time ), in this case you can use the DC1 with high level and short time and after that the second level lower than the first one.

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