Troubleshooting Welding Power Source; Troubleshooting Welding Power Source Issues - Miller XMT 350 FieldPro Owner's Manual

7-4. Troubleshooting Welding Power Source

Trouble
No weld output; unit completely in−operative
No weld output; meter display On.
Erratic of improper weld output.
When remote control is connected to unit output
is always on.
*Have a trained and qualified service technician check and replace line fuse(s).

7-5. Troubleshooting Welding Power Source Issues

If the welding power source is NOT responding after everything is connected, follow the items listed below before contacting the nearest
factory-authorized service agent:
Welding power source is plugged in and there is no power after turning on unit.
S If unit is directly connected to a line disconnect box or plugged into a receptacle from a line disconnect box, be sure that the line disconnect switch
or main breaker is in the ON position.
Weld is not consistent from one welding application to another.
S Be sure that work clamp is connected to a clean, paint-free area of pipe; otherwise, grind an area if necessary to make a good work connection.
S Keep work clamp as close as possible to joint being welded.
Follow recommended settings in Operation section of manual to select a starting point for welding.
S
Recommended joint preparation and fit-up is 1/32-1/16 in (0.8-1.6 mm) land and a 1/8 in (3.2 mm) root opening.
S
Porosity in weld bead (TIG welding).
Check shielding gas supply that there is enough gas and supply is turned on.
S
S Check shielding gas flow rate at regulator.
S Check that gas pressure does not exceed 90 psi (621 kPa).
S Check all shielding gas fitting and tighten if necessary.
S Shield joint from wind.
FieldPro Remote does not turn on.
S Check work sense lead connection. Be sure that the clamp is connected to a clean, paint-free area of the workpiece.
Place line disconnect switch in On position (see Section 5-4).
Check and replace line fuse(s), if necessary*.
Check for proper input power connections (see Section 5-4).
Check, repair, or replace RHC-14 remote control.
Unit overheated. Allow unit to cool with fan ON (see Section 4-6).
Check ammeter help displays.
Use proper size and type of weld cable.
Clean and tighten all weld connections.
Check volt sense lead. Straighten any coiled cables.
Check RHC-14 remote control switch and potentiometer resistances.
Remedy
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