Firepower MST 140i, Operating Manual

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Firepower MST 140i
Manual 0-53 38 3-9 INSTALLATION, OPERATION AND SETUP
5. Positive Welding Output Terminal
The positive welding terminal is used to connect the welding output of the power source
to the appropriate welding accessory such as the MIG Gun (via the MIG Gun polarity lead),
electrode holder lead or work lead. Positive welding current flows from the power source via
25mm Dinse style connector. It is essential, however, that the Dinse adapter and male plug
are inserted and turned securely to achieve a sound electrical connection.
CAUTION
Loose welding terminal connections can cause overheating and result in the male
plug being fused in the Dinse connector.
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6. MIG Gun Polarity Lead
The polarity lead is used to connect the MIG Gun to the appropriate positive or negative output
terminal (allowing polarity reversal for different welding applications). In general, the polarity
lead should be connected in to the positive welding terminal (+) when using steel, stainless
steel or aluminum electrode wire. When using flux cored (gasless) wire, the polarity lead is
generally connected to the negative welding terminal (-). If in doubt, consult the manufacturer
of the electrode wire for the correct polarity. It is essential, however, that the Dinse adapter
and male plug are inserted and turned securely to achieve a sound electrical connection.
CAUTION
Loose welding terminal connections can cause overheating and result in the male
plug being fused in the Dinse connector.
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7. Negative Welding Output Terminal
The negative welding terminal is used to connect the welding output of the Power Source
System to the appropriate welding accessory such as the MIG Gun (via the MIG Gun polarity
lead), TIG Torch or work lead. Negative welding current flows to the Power Source System
via 25mm Dinse style connector. It is essential, however, that the Dinse adapter and male
plug are inserted and turned securely to achieve a sound electrical connection.
CAUTION
Loose welding terminal connections can cause overheating and result in the male
plug being fused in the Dinse connector.
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