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Effective January 1, 2001

(Equipment with a serial number preface of “LB” or newer)

This limited warranty supersedes all previous Miller warranties and is exclusive with no other

guarantees or warranties expressed or implied.

LIMITED WARRANTY – Subject to the terms and conditions
below, Miller Electric Mfg. Co., Appleton, Wisconsin, warrants
to its original retail purchaser that new Miller equipment sold
after the effective date of this limited warranty is free of defects
in material and workmanship at the time it is shipped by Miller.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND FITNESS.

Within the warranty periods listed below, Miller will repair or
replace any warranted parts or components that fail due to
such defects in material or workmanship. Miller must be
notified in writing within thirty (30) days of such defect or
failure, at which time Miller will provide instructions on the
warranty claim procedures to be followed.

Miller shall honor warranty claims on warranted equipment
listed below in the event of such a failure within the warranty
time periods. All warranty time periods start on the date that
the equipment was delivered to the original retail purchaser, or
one year after the equipment is sent to a North American
distributor or eighteen months after the equipment is sent to an
International distributor.

1.

5 Years Parts – 3 Years Labor

*

Original main power rectifiers

*

Inverters (input and output rectifiers only)

2.

3 Years — Parts and Labor

*

Transformer/Rectifier Power Sources

*

Plasma Arc Cutting Power Sources

*

Semi-Automatic and Automatic Wire Feeders

*

Inverter Power Supplies

*

Intellitig

*

Engine Driven Welding Generators
(NOTE: Engines are warranted separately by
the engine manufacturer.)

3.

1 Year — Parts and Labor

*

DS-2 Wire Feeder

*

Motor Driven Guns (w/exception of Spoolmate
Spoolguns)

*

Process Controllers

*

Positioners and Controllers

*

Automatic Motion Devices

*

RFCS Foot Controls

*

Induction Heating Power Sources

*

Water Coolant Systems

*

HF Units

*

Grids

*

Maxstar 140

*

Spot Welders

*

Load Banks

*

Miller Cyclomatic Equipment

*

Running Gear/Trailers

*

Plasma Cutting Torches (except APT & SAF
Models)

*

Field Options
(NOTE: Field options are covered under True
Blue

 

for the remaining warranty period of the

product they are installed in, or for a minimum of
one year — whichever is greater.)

4.

6 Months — Batteries

5.

90 Days — Parts

*

MIG Guns/TIG Torches

*

Induction Heating Coils and Blankets

*

APT, ZIPCUT & PLAZCUT Model Plasma Cutting
Torches

*

Remote Controls

*

Accessory Kits

*

Replacement Parts (No labor)

*

Spoolmate Spoolguns

*

Canvas Covers

Miller’s True Blue

 Limited Warranty shall not apply to:

1.

Consumable components; such as contact tips,
cutting nozzles, contactors, brushes, slip rings,
relays or parts that fail due to normal wear.

2.

Items furnished by Miller, but manufactured by others,
such as engines or trade accessories. These items are
covered by the manufacturer’s warranty, if any.

3.

Equipment that has been modified by any party other
than Miller, or equipment that has been improperly
installed, improperly operated or misused based upon
industry standards, or equipment which has not had
reasonable and necessary maintenance, or equipment
which has been used for operation outside of the
specifications for the equipment.

MILLER PRODUCTS ARE INTENDED FOR PURCHASE
AND USE BY COMMERCIAL/INDUSTRIAL USERS AND
PERSONS TRAINED AND EXPERIENCED IN THE USE
AND MAINTENANCE OF WELDING EQUIPMENT.

In the event of a warranty claim covered by this warranty, the
exclusive remedies shall be, at Miller’s option: (1) repair; or (2)
replacement; or, where authorized in writing by Miller in
appropriate cases, (3) the reasonable cost of repair or
replacement at an authorized Miller service station; or (4)
payment of or credit for the purchase price (less reasonable
depreciation based upon actual use) upon return of the goods
at customer’s risk and expense. Miller’s option of repair or
replacement will be F.O.B., Factory at Appleton, Wisconsin, or
F.O.B. at a Miller authorized service facility as determined by
Miller. Therefore no compensation or reimbursement for
transportation costs of any kind will be allowed.

TO THE EXTENT PERMITTED BY LAW, THE REMEDIES
PROVIDED HEREIN ARE THE SOLE AND EXCLUSIVE
REMEDIES. IN NO EVENT SHALL MILLER BE LIABLE FOR
DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING LOSS OF
PROFIT), WHETHER BASED ON CONTRACT, TORT OR
ANY OTHER LEGAL THEORY.

ANY EXPRESS WARRANTY NOT PROVIDED HEREIN
AND ANY IMPLIED WARRANTY, GUARANTY OR
REPRESENTATION AS TO PERFORMANCE, AND ANY
REMEDY FOR BREACH OF CONTRACT TORT OR ANY
OTHER LEGAL THEORY WHICH, BUT FOR THIS
PROVISION, MIGHT ARISE BY IMPLICATION,
OPERATION OF LAW, CUSTOM OF TRADE OR COURSE
OF DEALING, INCLUDING ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR PARTICULAR
PURPOSE, WITH RESPECT TO ANY AND ALL
EQUIPMENT FURNISHED BY MILLER IS EXCLUDED AND
DISCLAIMED BY MILLER.

Some states in the U.S.A. do not allow limitations of how long
an implied warranty lasts, or the exclusion of incidental,
indirect, special or consequential damages, so the above
limitation or exclusion may not apply to you. This warranty
provides specific legal rights, and other rights may be
available, but may vary from state to state.

In Canada, legislation in some provinces provides for certain
additional warranties or remedies other than as stated herein,
and to the extent that they may not be waived, the limitations
and exclusions set out above may not apply. This Limited
Warranty provides specific legal rights, and other rights may
be available, but may vary from province to province.

 

Summary of Contents for Shopmaster 300 AC/DC

Page 1: ...ster 300 AC DC Processes Description TIG GTAW Welding Stick SMAW Welding Flux Cored FCAW Welding Arc Welding Power Source OM 322 203 118A April 2002 MIG GMAW Welding Visit our website at www MillerWel...

Page 2: ...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 again...

Page 3: ...NSTALLATION 9 2 1 Specifications 9 2 2 Volt Ampere Curves 9 2 3 Duty Cycle And Overheating 10 2 4 Selecting A Location 11 2 5 Dimensions And Weights 11 2 6 Weld Output Terminals And Selecting Cable Si...

Page 4: ......

Page 5: ...that cord plug is connected to a properly grounded receptacle outlet D When making input connections attach proper grounding conduc tor first double check connections D Frequently inspect input power...

Page 6: ...lding wire at contact tip when not in use D Wear oil free protective garments such as leather gloves heavy shirt cuffless trousers high shoes and a cap D Remove any combustibles such as a butane light...

Page 7: ...intained D Keep high frequency source doors and panels tightly shut keep spark gaps at correct setting and use grounding and shielding to minimize the possibility of interference ARC WELDING can cause...

Page 8: ...a human health hazard However studies are still going forth and evidence continues to be examined Until the final conclusions of the research are reached you may wish to minimize your exposure to ele...

Page 9: ...ation est bien raccord la borne de terre du sectionneur ou que la fiche du cordon est raccord e une prise correctement mise la terre D En effectuant les raccordements d entr e fixer d abord le conduct...

Page 10: ...des v tements de protection d pourvus d huile tels que des gants en cuir une chemise en mat riau lourd des pantalons sans re vers des chaussures hautes et un couvre chef D Avant de souder retirer tou...

Page 11: ...rements et dispositifs de protection LE RAYONNEMENT HAUTE FR QUENCE H F risque de provoquer des interf rences D Le rayonnement haute frequence peut provoquer des interf rences avec les quipements de r...

Page 12: ...hamps magn tiques basse fr quence Le courant de soudage pendant son passage dans les c bles de sou dage causera des champs lectromagn tiques Il y a eu et il y a encore un certain souci propos de tels...

Page 13: ...s AC 85 4 6 74 4 37 2 29 1 6 16 8 0 91 8 2 0 58 60 Hz NEMA Class II 50 300 CC 68 Volts DC 105 4 6 91 4 46 2 36 1 6 20 9 0 91 13 6 0 58 Amperes 32 Volts DC 50 Duty Cycle CV 40 Volts DC 103 7 90 6 2 45...

Page 14: ...erheating If unit overheats thermostat opens output stops and cooling fan runs Wait fifteen minutes for unit to cool Reduce amperage or duty cycle be fore welding Y Exceeding duty cycle can damage uni...

Page 15: ...label to determine input power needs 4 Line Disconnect Device Locate unit near correct input pow er supply Y Special installation may be required where gasoline or volatile liquids are present see NE...

Page 16: ...0 2 4 0 802 933 FCAW GMAW 500 2 0 3 0 4 0 2 2 0 2 3 0 2 4 0 3 3 0 3 3 0 Weld cable size AWG is based on either a 4 volts or less drop or a current density of at least 300 circular mils per ampere S 0...

Page 17: ...ommended Standard Fuse Or Circuit Breaker Rating In Amperes Circuit Breaker1 Time Delay 2 125 110 50 45 Normal Operating 3 150 125 70 50 Min Input Conductor Size In AWG Kcmil 4 6 8 10 Max Recommended...

Page 18: ...Select size and length using Section 2 9 4 Line Disconnect Device Select type and size of overcurrent protection using Section 2 9 Reinstall side panel Y Special installation may be required where gas...

Page 19: ...ge Control Switch Switch selects front panel or remote amperage voltagecontrol For remote amperage voltage control front panel control setting is the maximum output available For example If front pane...

Page 20: ...Clean And Tighten Weld Terminals 6 Months Blow Out Or Vacuum Inside During Heavy Service Clean Monthly OR 4 2 Circuit Breakers CB1 And CB2 Ref 802 932 Ref S 143 930 A 1 Circuit Breaker CB1 If CB1 open...

Page 21: ...proper size and type of weld cable see Section 2 6 Clean and tighten all weld connections Check position of Output Selector switch see Section Figure 3 1 Have Factory Authorized Service Agent check co...

Page 22: ...OM 322 Page 18 SECTION 5 ELECTRICAL DIAGRAM Figure 5 1 Circuit Diagram...

Page 23: ...OM 322 Page 19 203 057 B...

Page 24: ...OM 322 Page 20 SECTION 6 PARTS LIST 802 882 9 6 1 2 3 19 FIG 6 4 21 22 23 FIG 6 2 3 4 5 7 8 10 11 12 17 24 13 14 26 25 20 18 16 15 27 Figure 6 1 Main Assembly...

Page 25: ...4 CR1 110386 RELAY ENCL 24VAC DPDT 5A 120VAC 8PIN 1 1 15 203066 BRACKET XFMR REACTOR 1 1 16 203064 BRACKET RECTIFIER 1 1 17 T1 203053 XFMR POWER MAIN 200 230 460 1 17 T1 203268 XFMR POWER MAIN 230 460...

Page 26: ...OM 322 Page 22 802 885 Hardware is common and not available unless listed 17 18 19 1 2 3 4 5 5 6 7 8 9 10 11 6 12 13 11 14 12 15 16 20 21 Figure 6 2 Panel Front w Components...

Page 27: ...STR DX GRD 2P3W 15A 125V 5 15R 1 1 14 C13 16 128750 CAPACITOR CER DISC 1 UF 500 VDC W TERMS 4 4 15 203060 PANEL FRONT 1 1 16 097922 KNOB POINTER 875 DIA X 250 ID W SET SCREWSPLSTC 1 1 17 203 010 LABEL...

Page 28: ...4 203065 BRACKET MTG CAPACITOR 2 2 5 082902 STRIP MTG CENTER CAPACIT0R 1 1 6 191374 CAPACITOR ELCTLT 30000 UF 45 VDC CAN 1 75 DIA 8 8 7 R4 119998 RESISTOR WW FXD 300 W 5 OHM 1 1 8 180165 BLADE FAN 14...

Page 29: ...Notes...

Page 30: ...Notes...

Page 31: ...tting Torches Remote Controls Accessory Kits Replacement Parts No labor Spoolmate Spoolguns Canvas Covers Miller s True Blue Limited Warranty shall not apply to 1 Consumable components such as contact...

Page 32: ...complete and retain with your personal records Always provide Model Name and Serial Style Number Call 1 800 4 A Miller or see our website at www MillerWelds com to locate a DISTRIBUTOR or SERVICE AGEN...

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