Miller XMT 456 CC User manual

OM-203 034Y
2011−05
Processes
MIG (GMAW) Welding
With Optional Equipment:
Pulsed MIG (GMAW-P)
XMT 456 CC/CV:
Multiprocess Welding
Description
Invision 456P:
Invision 456P:
XMT 456 CC/CV:
R
Invision 456P And
XMT 456 CC/CV
(400 Volt Models)
File: MIG (GMAW)
Visit our website at
www.MillerWelds.com
IEC
™

Miller Electric manufactures a full line
of welders and welding related equipment.
For information on other quality Miller
products, contact your local Miller distributor to receive the latest full
line catalog or individual specification sheets. To locate your nearest
distributor or service agency call 1-800-4-A-Miller, or visit us at
www.MillerWelds.com on the web.
Thank you and congratulations on choosing Miller. Now you can get
the job done and get it done right. We know you don’t have time to do
it any other way.
That’s why when Niels Miller first started building arc welders in 1929,
he made sure his products offered long-lasting value and superior
quality. Like you, his customers couldn’t afford anything less. Miller
products had to be more than the best they could be. They had to be the
best you could buy.
Today, the people that build and sell Miller products continue the
tradition. They’re just as committed to providing equipment and service
that meets the high standards of quality and value established in 1929.
This Owner’s Manual is designed to help you get the most out of your
Miller products. Please take time to read the Safety precautions. They
will help you protect yourself against potential hazards on the worksite.
We’ve made installation and operation quick
and easy. With Miller you can count on years
of reliable service with proper maintenance.
And if for some reason the unit needs repair,
there’s a Troubleshooting section that will
help you figure out what the problem is. The
parts list will then help you to decide the
exact part you may need to fix the problem.
Warranty and service information for your
particular model are also provided.
Miller is the first welding
equipment manufacturer in
the U.S.A. to be registered to
the ISO 9001 Quality System
Standard.
Working as hard as you do
− every power source from
Miller is backed by the most
hassle-free warranty in the
business.
From Miller to You
Mil_Thank 2009−09

TABLE OF CONTENTS
SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING 1...................................
1-1. Symbol Usage 1........................................................................
1-2. Arc Welding Hazards 1..................................................................
1-3. Additional Symbols For Installation, Operation, And Maintenance 3.............................
1-4. California Proposition 65 Warnings 4.......................................................
1-5. Principal Safety Standards 4.............................................................
1-6. EMF Information 4......................................................................
SECTION 2 − CONSIGNES DE SÉCURITÉ − LIRE AVANT UTILISATION 5............................
2-1. Symboles utilisés 5.....................................................................
2-2. Dangers relatifs au soudage à l’arc 5......................................................
2-3. Dangers supplémentaires en relation avec l’installation, le fonctionnement et la maintenance 7......
2-4. Proposition californienne 65 Avertissements 8...............................................
2-5. Principales normes de sécurité 9..........................................................
2-6. Informations relatives aux CEM 9.........................................................
SECTION 3 − DEFINITIONS 11...................................................................
3-1. Manufacturer’s Warning Label Definitions 11.................................................
3-2. Symbols And Definitions 13...............................................................
3-3. WEEE Label 13.........................................................................
SECTION 4 − INSTALLATION 14..................................................................
4-1. Important Information Regarding CE Products (Sold Within The EU) 14...........................
4-2. Serial Number And Rating Label Location 14.................................................
4-3. Specifications 14........................................................................
4-4. Duty Cycle And Overheating 15............................................................
4-5. Volt-Ampere Curves 16...................................................................
4-6. Dimensions and Weight 16................................................................
4-7. Selecting A Location 17...................................................................
4-8. Connecting To Weld Terminals 17..........................................................
4-9. Weld Output Terminals And Selecting Cable Sizes* 18.........................................
4-10. Connecting Weld Output Cables 19.........................................................
4-11. Remote 14 Receptacle Information 19.......................................................
4-12. 115 Volts AC Duplex Receptacle 20........................................................
4-13. Electrical Service Guide 20................................................................
4-14. Connecting Input Power 21................................................................
SECTION 5 − OPERATION 22....................................................................
5-1. Front Panel Controls For CV Only Models 22.................................................
5-2. Mode And Voltage Control For CV Only Models 22............................................
5-3. Meter Functions For CV Only Models 23....................................................
5-4. Front Panel Controls For CC/CV Models 23..................................................
5-5. Meter Functions For CC/CV Models 24......................................................
5-6. Mode Switch Settings For CC/CV Models 25.................................................
5-7. Lift-Arc TIG Procedure For CC/CV Models 26................................................
SECTION 6 − MAINTENANCE & TROUBLESHOOTING 27...........................................
6-1. Routine Maintenance 27..................................................................
6-2. Blowing Out Inside Of Unit 27..............................................................
6-3. Removing Case and Measuring Input Capacitor Voltage 28.....................................
6-4. Voltmeter/Ammeter Help Displays 29.......................................................
6-5. Voltmeter/Ammeter Help Displays (Continued) 30.............................................
6-6. Troubleshooting 31......................................................................
SECTION 7 − ELECTRICAL DIAGRAM 32..........................................................
SECTION 8 − PARTS LIST 36.....................................................................
WARRANTY

OM-203 034 Page 1
SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING
som 2011−01
7
Protect yourself and others from injury — read and follow these precautions.
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-
plainedin the text.
NOTICE − Indicates statements not related to personal injury.
.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.
1-2. Arc Welding 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. The safety information given below is
only a summary of the more complete safety information
found in the Safety Standards listed in Section 1-5. Read and
follow all Safety Standards.
Only qualified persons should install, operate, maintain, and
repair this unit.
During operation, keep everybody, especially children, away.
ELECTRIC SHOCK can kill.
Touching live electrical parts can cause fatal shock
s
or severe burns. The electrode and work circuit i
s
electricallylive whenever the output is on. The inpu
t
power circuit and machine internal circuits are also
live when power is on. In semiautomatic or automati
c
wire welding, the wire, wire reel, drive roll housing
,
and all metal parts touching the welding wire are
electrically live. Incorrectly installed or improperl
y
groundedequipment is a hazard.
DDo not touch live electrical parts.
DWear dry, hole-free insulating gloves and body protection.
DInsulate yourself from work and ground using dry insulating mats
or covers big enough to prevent any physical contact with the work
or ground.
DDo not use AC output in damp areas, if movement is confined, or if
thereis a danger of falling.
DUse AC output ONLY if required for the welding process.
DIf AC output is required, use remote output control if present on
unit.
DAdditionalsafety precautions are required when any of the follow-
ing electrically hazardous conditions are present: in damp
locationsor while wearing wet clothing; on metal structures such
as floors, gratings, or scaffolds; when in cramped positions such
as sitting, kneeling, or lying; or when there is a high risk of unavoid-
ableor accidental contact with the workpiece or ground. For these
conditions,use the following equipment in order presented: 1) a
semiautomaticDC constant voltage (wire) welder, 2) a DC manual
(stick) welder, or 3) an AC welder with reduced open-circuit volt-
age.In most situations, use of a DC, constant voltage wire welder
is recommended. And, do not work alone!
DDisconnect input power or stop engine before installing or
servicing this equipment. Lockout/tagout input power according to
OSHA 29 CFR 1910.147 (see Safety Standards).
DProperly install and ground this equipment according to its
Owner’s Manual and national, state, and local codes.
DAlways verify the supply ground − check and be sure that input
powercord ground wire is properly connected to ground terminal in
disconnect box or that cord plug is connected to a properly
groundedreceptacle outlet.
DWhenmaking input connections, attach proper grounding conduc-
tor first − double-check connections.
DKeepcords dry, free of oil and grease, and protected from hot metal
and sparks.
DFrequently inspect input power cord for damage or bare wiring −
replace cord immediately if damaged − bare wiring can kill.
DTurn off all equipment when not in use.
DDo not use worn, damaged, undersized, or poorly spliced cables.
DDo not drape cables over your body.
DIf earth grounding of the workpiece is required, ground it directly
with a separate cable.
DDo not touch electrode if you are in contact with the work, ground,
or another electrode from a different machine.
DDo not touch electrode holders connected to two welding ma-
chines at the same time since double open-circuit voltage will be
present.
DUse only well-maintained equipment. Repair or replace damaged
parts at once. Maintain unit according to manual.
DWear a safety harness if working above floor level.
DKeep all panels and covers securely in place.
DClamp work cable with good metal-to-metal contact to workpiece
or worktable as near the weld as practical.
DInsulate work clamp when not connected to workpiece to prevent
contact with any metal object.
DDo not connect more than one electrode or work cable to any
singleweld output terminal.
SIGNIFICANT DC VOLTAGE exists in inverter weld-
ing power sources AFTER removal of input power.
DTurn Off inverter, disconnect input power, and discharge input
capacitors according to instructions in Maintenance Section
beforetouching any parts.
HOT PARTS can burn.
DDo not touch hot parts bare handed.
DAllow cooling period before working on equip-
ment.
DTo handle hot parts, use proper tools and/or
wear heavy, insulated welding gloves and
clothingto prevent burns.