Section 4 − Operation - MAC TOOLS MW250 Owner's Manual

WARNING
ELECTRIC SHOCK can kill.
•
Always wear dry insulating gloves.
•
Insulate yourself from work and ground.
•
Do not touch live electrical parts.
•
Keep all panels and covers securely in place.
FUMES AND GASES can be hazardous
to your health.
•
Keep your head out of the fumes.
•
Ventilate area, or use breathing device.
•
Read Material Safety Data Sheets (MSDSs) and
manufacturer's instructions for material used.
WELDING can cause fire or explosion.
•
Do not weld near flammable material.
•
Watch for fire; keep extinguisher nearby.
•
Do not locate unit over combustible surfaces.
•
Do not weld on closed containers.
•
Allow work and equipment to cool before handling.
ARCING can damage switch.
•
Do not change Voltage switch position while
welding.
Arcing inside switch can damage contacts, causing
switch to fail.
1
DO NOT SWITCH
UNDER LOAD
WIRE MODE
FULL
LOW
VOLTAGE RANGE
20−30V HIGH
10−20V LOW
SECTION 4 − OPERATION
2
Figure 4-1. Safety Equipment
Figure 4-2. Center Baffle Controls
ARC RAYS can burn eyes and skin;
NOISE can damage hearing.
•
Wear welding helmet with correct shade of filter.
•
Wear correct eye, ear, and body protection.
MOVING PARTS can cause injury.
•
Keep away from pinch points such as drive rolls.
•
Keep all doors, panels, covers, and guards closed
and securely in place.
MAGNETIC FIELDS FROM HIGH CUR-
RENTS can affect pacemaker operation.
•
Pacemaker wearers keep away.
•
Wearers should consult their doctor before going
near arc welding, gouging, or spot welding opera-
tions.
WELDING CURRENT can damage elec-
tronic parts in vehicles.
•
Disconnect both battery cables before welding on a
vehicle.
•
Place work clamp as close to the weld as possible.
See Safety Precautions at beginning of manual for ba-
sic welding safety information.
3
1 2
swarn6.2 8/92
Wear the following while welding:
1 Dry, Insulating Gloves
2 Safety Glasses With Side
Shields
3 Welding Helmet With Correct
Shade Of Filter (See ANSI
Z49.1)
sb3.1 1/94
1 Wire Mode Switch
For better control of wire speed use
Low position when wire speed is
between 90 and 670 ipm. Use Full
position when wire speed is be-
tween 150 ipm and 1030 ipm.
2 Voltage Range Selector
Place switch in desired position.
See inside rear cover for settings.
Ref. ST-801 103-B / S-171 601
OM-154 501 Page 10