Section 1 − Safety Precautions For Servicing; Symbol Usage; Servicing Hazards - Miller Auto-Line Invision 352 MPa Technical Manual

SECTION 1 − SAFETY PRECAUTIONS FOR SERVICING
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Protect yourself and others from injury — read, follow, and save these important safety precautions and operating instructions.

1-1. Symbol Usage

DANGER! − Indicates a hazardous situation which, if
not avoided, will result in death or serious injury. The
possible hazards are shown in the adjoining symbols
or explained in the text.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury. The possible
hazards are shown in the adjoining symbols or ex-
plained in the text.
NOTICE − Indicates statements not related to personal injury.

1-2. Servicing Hazards

The 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.
Only qualified persons should install, operate, maintain, and
repair this equipment. A qualified person is defined as one
who, by possession of a recognized degree, certificate, or
professional standing, or who by extensive knowledge, train-
ing and experience, has successfully demonstrated the
ability to solve or resolve problems relating to the subject
matter, the work, or the project and has received safety train-
ing to recognize and avoid the hazards involved.
During servicing, keep everybody, especially children, away.
ELECTRIC SHOCK can kill.
D Do not touch live electrical parts.
D Turn 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.
D Do not work on equipment unless it has been verified that the ma-
chine case is not energized.
D Insulate yourself from ground by standing or working on dry insulat-
ing mats big enough to prevent contact with the ground.
Do not leave live unit unattended.
D
D If this procedure requires an energized unit, have only personnel
familiar with and following standard safety practices do the job.
D When testing a live unit, use the one-hand method. Do not put both
hands inside unit. Keep one hand free.
D Disconnect input power conductors from deenergized supply line
BEFORE moving a welding power source.
SIGNIFICANT DC VOLTAGE exists in inverter weld-
ing power sources AFTER removal of input power.
D Turn off unit, disconnect input power, and discharge input capaci-
tors according to instructions in Manual before touching any parts.
Invision 352 MPa
.
Indicates special instructions.
This group of symbols means Warning! Watch Out! ELECTRIC
SHOCK, MOVING PARTS, and HOT PARTS hazards. Consult sym-
bols and related instructions below for necessary actions to avoid
these hazards.
ARC FLASH can kill.
Arc flash is the rapid and violent release of energy that
occurs when electric current leaves its intended path
and arcs to other conductors or to ground. Arc flash
can be caused by equipment failure (faulty insulation,
corrosion, dust) improper installation, human error (improper tool
placement), and other factors. Conductive vapors can sustain the
arc until over-current devices open the circuit. Individuals within
the arc flash boundary are at risk.
D Do not work on energized equipment unless an assessment of
arc flash risk from the electrical supply circuit has been conducted
by a qualified person and you have been trained in safe work prac-
tices by your employer.
D Follow requirements in NFPA 70E for safe work practices and
Personal Protective Equipment (PPE).
STATIC (ESD) can damage PC boards.
D Put on grounded wrist strap BEFORE handling
boards or parts.
D Use proper static-proof bags and boxes to
store, move, or ship PC boards.
FIRE OR EXPLOSION hazard.
D Do not place unit on, over, or near combustible
surfaces.
D Do not service unit near flammables.
FLYING METAL or DIRT can injure eyes.
D Wear safety glasses with side shields or face
shield during servicing.
D Be careful not to short metal tools, parts, or
wires together during testing and servicing.
HOT PARTS can burn.
D Do not touch hot parts bare handed.
D Allow cooling period before working on
equipment.
D To handle hot parts, use proper tools and/or wear heavy, insu-
lated welding gloves and clothing to prevent burns.
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