15
OPERATION
MMA Welding
THE POWER/INPUT VOLTAGE SELECTOR SWITCH ON THIS EQUIPMENT DOES NOT ISOLATE THE UNIT FROM
THE MAIN ELECTRICAL SUPPLY. AC POWER IS PRESENT ON THE SWITCH TERMINALS.
BEFORE REMOVING THE COVER FOR MAINTENANCE, ISOLATE THE UNIT FROM THE MAINS SUPPLY.
While welding try to adopt a relaxed attitude
1. Always commence with a last minute check for safety and protection.
2. In the Process Selector Switch, select Standard Stick or Arc Force Stick.
3. Check that the electrode holder and work return lead connections are secure.
4. Fit the appropriate size of electrode
5. Using the current control, set the welding current.
6. Hold the electrode away from the work, trailing the welding lead over the shoulder to reduce the weight on the hand doing the
welding.
7. Keeping the electrode clear of any exposed metal surface, switch on the unit.
8. Position the electrode close to the point where welding is to commence, without actually touching the work.
9. Cover the eyes with a headscreen or handshield and warn bystanders.
10. (a) Scrape the electrode on the work surface at the start point (as though striking a match). The arc should strike.
SECTION 3 OPERATION
WELDING CURRENT CONTROL
Output current can be set in the
range 10 to 150A
Over-Temperature Indicator
Power ON/OFF
Switch
25A CIRCUIT BREAKER
(press to reset)
NEGATIVE OUTPUT
TERMINAL
POSITIVE OUTPUT
TERMINAL
PROCESS SELECTOR
THERMAL OVERLOAD INDICATOR
Indicates ‘overload’ condition. If the lamp
lights, leave the unit switched on with
the fan running and allow to cool. Reset is
automatic after the unit cools.
Figure 3.1
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