Miller Electric S-21E, Technical Manual

Page: 5 / 48

SECTION 1
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SAFETY PRECAUTIONS AND SIGNAL WORDS
1-1. GENERAL INFORMATION AND SAFETY
This manual provides theory of operation along with
specific operating, testing, and troubleshooting proce-
dures. It also includes precautionary information rele-
vant to these procedures. This manual can be an effec-
tive tool in the hands of a trained serviceperson. How-
ever, it does not and cannot take the place of previous
training nor safety-conscious service work. If any doubt
arises about the specific application of procedures pre-
sented, or if problems arise which are not covered in this
manual, contact the factory Service Department before
proceeding further.
1-2. SAFETY ALERT SYMBOL AND SIGNAL
WORDS
The following safety alert symbol and signal words are
used throughout this manual to call attention to and
identify different levels of hazard and special instruc-
tions.
This safety alert symbol is used with the signal
A
words WARNING and CAUTION to call atten-
tion to the safety statements.
A
WARNING statements identify procedures or
practices which must be followed to avoid seri-
ous personal injury or loss of life.
CAUTION statements identify procedures or
A
practices which must be followed to avoid minor
personal injury or damage to this equipment.
IMPORTANT
statements identify special instructions
necessaryfor the most efficient operation of this equip-
ment.
1-3. SAFETY PRECAUTIONS
A
WARNING: ELECTRIC SHOCK can kill.
S
Do not touch live electrical parts.
• Protect yourself with dry insulating gloves
and clothing.
• Insulate yourself from ground by using
rubber9loves and insulating floormats when
power is applied to the unit.
• Shut down unit and disconnect input power
when servicing unless the procedure specifi-
cally requires an energized unit.
• Do not leave live unit unattended.
ARC RAYS, SPARKS, AND HOT SURFACES
can burn eyes and skin; NOISE can damage
hearing.
• Wear correct eye, ear, and body protection.
FUMES AND GASES can seriously harm
your health.
• Keep your head out of the fumes.
• Ventilate to keep from breathing fumes and
gases.
• If ventilation is inadequate, use approved
breathing device.
• Read Material Safety Data Sheets (MSDSs)
and manufacturer’s instructions for any
materials used.
WELDING WIRE can cause puncture
wounds.
• Do not point gun toward any part of the body,
any conductive surface, or other personnel.
HOT METAL, SPATrER, AND SLAG can
cause fire and burns.
• Watch for fire.
• Have a fire extinguisher nearby and know
how to use it.
• Do not use near flammable material.
• Allow work and equipment to cool before
handling.
MOVING PARTS can cause serious injury.
• Keep away from moving parts.
HOT SURFACES can cause severe burns.
• Allow cooling period before servicing.
MAGNETIC FIELDS FROM HIGH CURRENTS
can affect pacemaker operation.
• Wearers should consult their doctor before
going near the servicing ofarc welding equip-
ment or any arc welding operations.
5-21E TM-1571 Page 1