Instruction/ maintenance manual of the product HF-251-2 Miller Electric
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HF-251D-1 And HF-251-2 Processes Description TIG (GT A W ) W elding OM-611 096 556U January 2004 High Frequency Arc Starter Visit our website at www.MillerWelds.
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 catalog sheets. T o locate your nearest distributor or service agency call 1-800-4-A-Miller , or visit us at www .
T ABLE OF CONTENTS SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1. Symbol Usage 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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OM-61 1 Page 1 Return T o T able Of Contents SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING som _8/03 1-1. Symbol Usage Means W arning! W atch Out! There are possible hazards with this procedure! The possible hazards are shown in the adjoining symbols.
OM-61 1 Page 2 Return T o T able Of Contents Arc rays from the welding process produce intense visible and invisible (ultraviolet and infrared) rays that can burn eyes and skin.
OM-61 1 Page 3 Return T o T able Of Contents 1-3. Additional Symbols For Installation, Operation, And Maintenance FIRE OR EXPLOSION hazard. D Do not install or place unit on, over , or near combustible surfaces.
OM-61 1 Page 4 Return T o T able Of Contents 1-5. Principal Safety Standards Safety i n W elding, Cutting, and Allied Processes, ANSI Standard Z49.1, from American W elding Society , 550 N.W . LeJeune Rd, Miami FL 33126 (phone: 305-443-9353, website: www .
OM-61 1 Page 5 Revenez à la table des matières SECTION 2 − CONSIGNES DE SÉCURITÉ − À LIRE A V ANT UTILISA TION som_fre 8/03 2-1. Signification des symboles Signifie « Mise en garde. Faire preuve de vigilance. » Cette procédure présente des risques identifiés par les symboles adjacents aux directives.
OM-61 1 Page 6 Revenez à la table des matières Le rayonnement de l’arc génère des rayons visibles et invisibles intenses (ultraviolets et infrarouges) suscep- tibles de causer des brûlures oculaires et cutanées. Des étincelles sont projetées pendant le soudage.
OM-61 1 Page 7 Revenez à la table des matières 2-3. Autres symboles relatifs à l’installation, au fonctionnement et à l’entretien de l’appareil. Risque D’INCENDIE OU D’EXPLO- SION D Ne pas placer l’appareil sur une surface inflam- mable, ni au−dessus ou à proximité d’elle.
OM-61 1 Page 8 Revenez à la table des matières 2-4. Principales normes de sécurité Safety in W elding, Cutting, and Allied Processes, norme ANSI Z49.1, de l’American W elding Society , 550 N .W . LeJeune Rd, Miami FL 33126 (téléphone : (305) 443−9353, site Web : www .
OM-61 1 Page 9 Return T o T able Of Contents SECTION 3 − INST ALLA TION 3-1. Specifications W elding Circuit Rat- Input Powe r Cord With T ype Of Input Power Dimensions W eight Circuit Rat- ing Cord.
OM-61 1 Page 10 Return T o T able Of Contents Obtain gas cylinder and chain to running gear , wall, or other station- ary support so cylinder cannot fall and break of f valve. 1 Cap 2 Cylinder V alve Remove c ap, stand to side of valve, and open valve slightly.
OM-61 1 Page 1 1 Return T o T able Of Contents The supplied cord with plugs is for use with CC or CC/CV welding power sources having the proper , matching 14-pin receptacle. Do not use cordset on machines without the 14-pin receptacle. NOTE 159 645-A / Ref.
OM-61 1 Page 12 Return T o T able Of Contents sb7.1 5/94 − Ref. 098 957-D / Ref. S-0004-A / S-0750 / Ref. 141 127-B 1 Operator Control Receptacle RC1 (See Section 3-6) 2 Keyway 3 Plug 4 Threaded Collar T o connect to receptacle, align keyway , insert plug, and tighten threaded collar .
OM-61 1 Page 13 Return T o T able Of Contents Y T urn Off HF Unit and welding power source, and discon- nect input power before making connections. Stop engine on welding genera- tors. Y Not connecting work cables to HF Unit will damage power source. Always connect work cables to W ork Input/ Output terminal.
OM-61 1 Page 14 Return T o T able Of Contents Ref. 159 606-B / Ref. 149 354-A Y Read and follow entire Sec- tion 8 about HF equipment be- fore i n s t a l l i n g u n i t . Y Direct Current (DC) will dam- age HF Unit. Connect unit only to Alternating Current (AC) supply .
OM-61 1 Page 15 Return T o T able Of Contents SECTION 4 − OPERA TION Ref. 098 956-D 1 Power Switch 2 Pilot Light 3 High Frequency Selector Switch 4 High Frequency Switch 5 High Frequency Intensity Control 4 5 12 3 4-1. Controls Ref. 139 573 1 High Frequency Switch Start − provides HF for arc starting only .
OM-61 1 Page 16 Return T o T able Of Contents 1 High Frequency Intensity Control Use control to change amount of HF energy used to start and/or maintain the arc. Set as low as practical to prevent interfering with electronic equipment. 1 4-4. High Frequency Intensity Control 1 Power Switch Use switch to turn unit On and Off.
OM-61 1 Page 17 Return T o T able Of Contents SECTION 5 − MAINTENANCE & TROUBLESHOOTING Disconnect all power before maintaining. 3 Months OR Blow O u t Or V acuum Inside Clean And T ighten W eld.
OM-61 1 Page 18 Return T o T able Of Contents Ref. 098 956-G T urn Of f unit and welding power source and disconnect input power . Loosen screw on spark gap access door and open. 1 Tungsten End Of Point Do not clean or dress tungsten. Replace point if tungsten end disappears.
OM-61 1 Page 19 Return T o T able Of Contents 5-3. T roubleshooting T rouble Remedy Unit completely inoperative; Pilot light Of f. Secure input power cord plug in receptacle (see Section 3-8 ). Place Power switch in the On position (see Section 4-5). Lack of high-frequency; difficulty in es- tablishing an arc.
OM-61 1 Page 20 Return T o T able Of Contents SECTION 6 − ELECTRICAL DIAGRAMS 130 555-D Figure 6-1. Circuit Diagram For 1 15 V olts Model.
OM-61 1 Page 21 Return T o T able Of Contents 140 903-E Figure 6-2. Circuit Diagram For 230 V olts Model.
OM-61 1 Page 22 Return T o T able Of Contents SECTION 7 − HIGH FREQUENCY 7-1. Welding Processes Requiring High Frequency high_freq 12/96 − S-0693 1 High-Frequency V oltage TIG − helps arc jump air gap between torch and workpiece and/ or stabilize the arc.
OM-61 1 Page 23 Return T o T able Of Contents 7-3. Correct Installation 1 High-Frequency Source (welding power source with built-in HF or separate HF unit) Ground metal machine case, work output terminal, line disconnect device, input supply , and worktable.
OM-61 1 Page 24 Return T o T able Of Contents SECTION 8 − SELECTING AND PREP ARING TUNGSTEN ELECTRODE FOR DC OR AC WELDING ac/dc_gtaw 2/2004 Y Whenever possible and practical, use DC weld output instead of AC weld output.
OM-61 1 Page 25 Return T o T able Of Contents 8-2. Preparing T ungsten Electrode For W elding Y Grinding the tungsten electrode produces dust and flying sparks which can cause injury and start fires. Use local exhaust (forced ventilation) at the grinder or wear an approved respirator .
OM-61 1 Page 26 Return T o T able Of Contents 9 -2. T orch Movement During Welding 162 002-B T ungsten Without Filler Rod T ungsten With Filler Rod Form pool T ilt torch Move torch to front of pool. Repeat process. 75 ° 75 ° W elding direction Form pool Tilt torch Add filler metal Move torch to front of pool.
OM-61 1 Page 27 Return T o T able Of Contents Notes.
OM-61 1 Page 28 Return T o T able Of Contents SECTION 10 − P ARTS LIST Figure 10-1. Complete Assembly (Part 1 of 2) (115V Model) 098 955-L Part 1 of 2 .
OM-61 1 Page 29 Return T o T able Of Contents 1 15V Description Part No. Dia. Mkgs. Item No. Figure 10-1. Complete Assembly (Part 1 of 2) Model Quantity 230V 2 206 108 SADDLE CLAMP ASSY 1 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OM-61 1 Page 30 Return T o T able Of Contents 098 955-L Part 2 of 2 . Hardware is common and not available unless listed. 1 2 3 4 5 6 7 8 7 9 10 16 17 18 19 20 25 21 22 24 25 26 27 23 15 13 14 12 Figure 10-2.
OM-61 1 Page 31 Return T o T able Of Contents 1 15V Description Part No. Dia. Mkgs. Item No. Figure 10-2. Complete Assembly (Part 2 of 2) Model Quantity 230V 1 SR3 035 704 RECTIFIER, integ 40A 800V 1 . . . . . . . . . . . . . . . . . . . . . . . . . .
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Warranty Questions? Call 1-800-4-A-MILLER for your local Miller distributor. miller_warr 8/03 Y ou r distributor also gives you ... Service Y ou always get the fast, reliable response you need. Most replacement parts can be in your hands in 24 hours. Support Need fast answers to the tough welding questions? Contact your distributor .
PRINTED IN USA 2004 Miller Electric Mfg. Co. 1/04 Miller Elect ric Mfg. Co. An I l li noi s T ool Works Com pany 1635 W es t Spenc er S treet Applet on, W I 5 4914 USA International He adquarte rs.
An important point after buying a device Miller Electric HF-251-2 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Miller Electric HF-251-2 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Miller Electric HF-251-2 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Miller Electric HF-251-2 you will learn all the available features of the product, as well as information on its operation. The information that you get Miller Electric HF-251-2 will certainly help you make a decision on the purchase.
If you already are a holder of Miller Electric HF-251-2, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Miller Electric HF-251-2.
However, one of the most important roles played by the user manual is to help in solving problems with Miller Electric HF-251-2. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Miller Electric HF-251-2 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
