SECTION 1 − SAFETY PRECAUTIONS FOR SERVICING
1-1. Symbol Usage
safety_stm 5/97
Means Warning! Watch Out! There are possible hazards with this procedure! The possible hazards are shown in the adjoining symbols.
YMarks a special safety message.
.Means “Note”; not safety related.
This group of symbols means Warning! Watch Out! possible ELECTRIC SHOCK, MOVING PARTS, and HOT PARTS hazards. Consult symbols and related instructions below for necessary actions to avoid the hazards.
1-2. Servicing Hazards
YThe symbols shown below are used throughout this manual to call attention to and identify possible hazards. When you see the symbol, watch out, and follow the related instructions to avoid the hazard.
YOnly qualified persons should service, test, maintain, and re- pair this unit.
YDuring servicing, keep everybody, especially children, away.
FLYING METAL can injure eyes.
DWear safety glasses with side shields or face shield during servicing.
DBe careful not to short metal tools, parts, or wires together during testing and servicing.
ELECTRIC SHOCK can kill.
DDo not touch live electrical parts.
DTurn Off welding power source and wire feeder
and disconnect and lockout input power using line disconnect switch, circuit breakers, or by removing plug from re- ceptacle, or stop engine before servicing unless the procedure spe- cifically requires an energized unit.
DInsulate yourself from ground by standing or working on dry insulat- ing mats big enough to prevent contact with the ground.
DDo not leave live unit unattended.
DIf this procedure requires an energized unit, have only personnel familiar with and following standard safety practices do the job.
DWhen testing a live unit, use the
DDisconnect input power conductors from deenergized supply line BEFORE moving a welding power source.
SIGNIFICANT DC VOLTAGE exists after removal of input power on inverters.
DTurn Off inverter, disconnect input power, and discharge input capacitors according to instructions in Maintenance Section before touching any parts.
STATIC (ESD) can damage PC boards.
DPut on grounded wrist strap BEFORE handling
boards or parts.
D Use proper
HOT PARTS can cause severe burns.
DDo not touch hot parts bare handed.
DAllow cooling period before working on welding gun or torch.
EXPLODING PARTS can cause injury.
DFailed parts can explode or cause other parts to explode when power is applied to inverters.
DAlways wear a face shield and long sleeves when servicing inverters.
SHOCK HAZARD from testing.
DTurn Off welding power source and wire feeder or stop engine before making or changing me- ter lead connections.
DUse at least one meter lead that has a self- retaining spring clip such as an alligator clip.
DRead instructions for test equipment.
FALLING UNIT can cause injury.
DUse lifting eye to lift unit only, NOT running gear, gas cylinders, or any other accessories.
DUse equipment of adequate capacity to lift and support unit.
DIf using lift forks to move unit, be sure forks are long enough to extend beyond opposite side of unit.
FIRE OR EXPLOSION hazard.
D Do not place unit on, over, or near combustible surfaces.
DDo not service unit near flammables.
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MOVING PARTS can cause injury.
DKeep away from moving parts such as fans.
DKeep all doors, panels, covers, and guards closed and securely in place.