Reversing Polarity; 4.9.1 Dusty Work Environments - Kemppi Kempact 251R Operating Manual

4.9

Reversing polarity

Some filler wires are recommended to be welded with the gun in the minus pole (–), so the
polarity should be reversed. Check the recommended polarity from the filler wire package.
1. Disconnect the machine from the mains.
2. Expose the terminal connections by bending the protective rubber covers away from the
terminal.
3. Remove the terminal tightening nuts and washers. Note the correct order of the
washers!
4. Interchange the cables.
5. Install the washers in place and re-tightening the securing nuts.
6. Replace the rubber terminal covers. The rubber covers must always protect the terminals
during use.

4.9.1 Dusty work environments

If the working environment frequently carries airborne metallic dust particles due to
fabrication practices, it is recommended that you install a filter casette to the machine.
Particle filter cassette's ordering code: W005852.
Fitting the particle filter cassette provides additional protection to your welding machine and
lengthens its service intervals.
Filter maintenance
Once fitted, the filter should be removed, checked and cleaned with dry compressed air
weekly. Every six months, wash the filter in a solution of warm soapy water. Allow to dry
thoroughly before replacing.
© Kemppi Oy / 1135
EN
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