– Mastertig MLs™ 300 aCDC / 0743
© keMppi oy
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2.7. WELdINg CAbLE CONNECTIONS
The welding cables must be made of at least 16 mm² copper cable.
2.7.1. Choosing welding polarity in MMA welding
You can select the polarity electronically from the control panel, i.e. you do not have to switch the places of
the (+) and (-) connectors. Connect always the negative connector to the work piece.
2.7.2. Earthing
If possible, always fasten the earth clamp of return current cable directly onto work piece.
1. Clean contact surface of earth clamp from paint and rust.
2. Fasten clamp properly, so that contact surface is as large as possible.
3. Check that clamp is fastened firmly.
2.8. COOLINg uNIT TO mASTERCOOL 20
Cooling liquid is injurious! Avoid also contact with skin or eyes. In case of injury, seek
for medical advice.
Cooling unit Mastercool 20 together with TIG torch Kemppi TTC-W range enables TIG welding
with water-cooled torch.
The cooling unit is installed beneath the power source with screws. Electrical connections are on
the bottom of power source. Fill the reservoir with a 20 – 40 % mixture of glycol and water, or
with any other suitable antifreeze. The capacity of the reservoir is 3 litres.
Mastercool 20
Installation of cooling unit:
Electrical connection
for the cooling unit:
1. 230 V
2. Control connector
3. Equipment earth
Only an authorised
electrician is allowed to
install electrical connection!
