Troubleshooting.Miller xmt 304 cc/cv manual
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Table Of Contents. Quick Links. See also: Owner's Manual. Table of Contents. Previous Page. Next Page. With KK D Keep all doors, panels, covers, and guards D Do not service unit near flammables. Page 7: Section 2 - Definitions Wear complete body protection. Become trained and read the instructions before working on the machine or welding.
Do not remove or paint over cover the label. Page 8 Keep angle of lifting device less than 60 degrees. Page 9: Manufacturer's Rating Labels Page Section 3 - Installation Reduce amperage or duty cycle be- fore welding. Y Exceeding duty cycle can damage unit and void war- ranty. Page Volt-Ampere Curves Curves of other settings fall be- tween curves shown. CC Mode B. Page Remote 14 Receptacle Information CB1 protects volt ac portion of duplex receptacle and Remote 14 receptacle from overload.
CB2 protects 24 volt ac portion of Remote receptacle from overload. Press button to reset breaker. For welding position is selected on mode switch. Page Lift-Arc Trigger Hold Tig Note: If output switch is momen- tarily depressed and tungsten is not touching workpiece: Do not touch tungsten to work.
Output will shut off in 3 seconds. Start sequence over. Page 25 When the inductor is placed in an AC circuit it is referred to as a reactor where it now acts to restrict the flow of current. Page Section 7 - Pre-Power Checklist If resistance is less than ohms, isolate diodes D1 and D2 and retest individually diode test.
Resistance should be approximately 35 ohms. Page Diodes diode test. Effective with Serial No. KK, these diodes are no longer present.
Troubleshooting Table See Section or for test points and values and Section 11 for parts location. Trouble Remedy No weld output; unit completely Place line disconnect switch in On position see Section Page 33 Reduce gas flow rate. Tungsten electrode oxidizing and not Shield weld zone from drafts. Increase postflow time.
Check and tighten all gas fittings. Water in torch. Refer to torch manual. L P—5 ondary power circuit of the unit. If this display is shown, check control board PC1 see Section If this display is shown, Indicates the left side of the unit has over- the applicable input voltage. If this display is check thermistor RT1. Page 37 1. Page Waveforms For Sections And Page 43 Prior to Serial No. KG, not used; effective with Serial No. No test point values provided for this PC board.
To blow out unit, direct airflow through front and back louvers as shown. Proceed with job inside unit. Reinstall case when finished. Page Checking Bus Voltage Imbalance Turn off unit and wait for voltage to drop to near 0 zero volts accord- ing to Section Prior to Serial No. KK, reconnect plug 12 to receptacle 3.
Reinstall case. Page Section 10 - Electrical Diagrams The following is a list of all diagrams for models covered by this manual. Page 51 SC Figure Page 52 SC C Figure Page 53 Figure Page 54 Figure Page 56 Figure Page 58 Figure Page 60 Figure Page 62 Figure Page 64 Figure Page 66 Figure Page 68 SB Figure KK And Following Figure Page 69 SA Figure Replace with proper PCB assembly.
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