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SECTION 8 − SAFETY PRECAUTIONS FOR SERVICING

Protect yourself and others from injury — read, follow, and save these important safety precautions and operating instructions.

8-1. 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.

8-2. 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 test, maintain, and repair this

unit.

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.

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.

If this procedure requires an energized unit, have only personnel

familiar with and following standard safety practices do the job.

When testing a live unit, use the one-hand method. Do not put both

hands inside unit. Keep one hand free.

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.

Turn Off inverter, disconnect input power, and discharge input

capacitors according to instructions in Troubleshooting Section be-

fore touching any parts.

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.

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 the

hazards.

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, insulated welding gloves and

clothing to prevent burns.

EXPLODING PARTS can injure.

D Failed parts can explode or cause other parts to

explode when power is applied to inverters.

D Always wear a face shield and long sleeves

when servicing inverters.

SHOCK HAZARD from testing.

D Turn Off welding power source and wire feeder

or stop engine before making or changing me-

ter lead connections.

D Use at least one meter lead that has a self-

retaining spring clip such as an alligator clip.

D Read instructions for test equipment.

FALLING EQUIPMENT can injure.

D Use lifting eye to lift unit only, NOT running

gear, gas cylinders, or any other accessories.

D Use equipment of adequate capacity to lift and

support unit.

D If using lift forks to move unit, be sure forks are long enough to

extend beyond opposite side of unit.

D Follow the guidelines in the Applications Manual for the Revised

NIOSH Lifting Equation (Publication No. 94−110) when manu-

ally lifting heavy parts or equipment.

OM-217 751S - 2012−06, safety_stm 2011−10

OM-217 751 Page 27