使用时请注意区分输入端与输出端，以及输出端的正负极性，核对无误后才能通电；

Before connecting this unit, please make sure that the input and output terminal, and the positive and negative polarities of output terminal are on the right position respectively.

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先确认电缆与焊钳和铜线耳已可靠连接，用螺栓将铜线耳和焊机极性为“-”的输出端可靠地连接在一起。

First confirmation of welding cable clamp and copper ears have reliable connectivity, will bolt copper ears, and welder polarity "-" reliable output link.

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