5 OPERATION
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5.3
MMA welding
MMA welding may also be referred to as welding with covered electrodes. The arc melts
the electrode as well as a local part of the workpiece. The coverage, when melting,
forms a protective slag and creates a shielding gas to protect the weld pool from
atmospheric contamination.
For MMA welding, the welding power source shall be supplemented with:
•
welding cable with electrode holder
•
return cable with clamp
5.4
Connection of welding and return cables
The power source has two outputs, a positive welding terminal (+) and a negative welding terminal (-),
for connecting welding and return cables. The output to which the welding cable is connected depends
on the welding method or type of electrode used.
Connect the return cable to the other output on the power source. Secure the return cable's contact
clamp to the work piece and ensure that there is good contact between the work piece and the output
for the return cable on the power source.
•
For TIG welding, the negative welding terminal (-) is used for the welding torch and
the positive welding terminal (+) is used for the return cable.
•
For MMA welding, the welding cable can be connected to the positive welding
terminal (+) or negative welding terminal (-) depending on the type of electrode used.
The connecting polarity is stated on the electrode packaging.
5.5
Turning the mains power ON/OFF
Turn ON the mains power by turning the switch to the ”ON”.
Turn the unit OFF by turning the switch to the ”OFF” position.
Regardless the mains supply is interrupted abnormally, or the power source is switched off in the
normal manner, the welding data will be stored, so it will be available next time the unit is turned ON.
CAUTION!
Do not turn OFF the power source during welding (with load).
5.6
Fan control and Cool 2
The power source has an automatic thermal control. When turning ON the main power switch, the fan
will run for 10 seconds and then stop. Once welding start, the fan continues to run for a few minutes
after welding has stopped while the power source switches to energy-saving mode. The fan starts
again when welding restarts. When Cool 2 is connected to the power source, Cool 2 will be synced
with the fan.
5.7
Thermal protection
The power source includes thermal protection against overheating. When temperature is
up to 80% limitation, the overheating indicator on the panel will blink; once temperature
exceeds the limitation, the welding is stopped and overheating indicator will be lit and an
error message shows in the display. The protection is automatically reset when the
temperature has been sufficiently reduced.
