Thermal Arc EXCEL-ARC 750 CC

Questions and Answers

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Julie HallAug 18, 2025
How to troubleshoot a Thermal Arc Welding System that will not start?
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  kgrantAug 19, 2025
  If your Thermal Arc Welding System isn't starting, here's what to check: * Ensure the power switch is in the ON position. * Verify the voltage of the power lines. * Look for and repair any breaks in the power lead. * Confirm you're using the correct line voltage. * Check the input power connections against the wiring diagram. * Inspect for open circuits to the power switch or control transformer, repairing any broken wires or loose connections. * Examine the control transformer fuse and replace it if blown, after addressing the cause.
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Christina TuckerAug 21, 2025
What to do if Thermal Arc Welding System shuts down soon after delivering welding current?
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  Jennifer ChenAug 21, 2025
  If the Thermal Arc Welding System unit delivers welding current but soon shuts down (Thermal overload trips), consider the following: * Reduce the load on the welding machine, as overloads can only be sustained for a short period. * Avoid continuous operation at overload currents to prevent exceeding the duty cycle. * Replace power leads that are too long or have too small a cross-section with larger diameter cables. * Reduce loads when the ambient temperature is above 104° F (40° C). * Ensure that the air intake and exhaust openings are not obstructed. * Check the fan thermostat and test the fan by applying motor nameplate voltage to test, inspecting the bearings.
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Tammy LeonAug 23, 2025
Why does the contactor chatter on my Thermal Arc Welding System?
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  Stephen NelsonAug 23, 2025
  If the line contactor in your Thermal Arc Welding System chatters, it could be due to a couple of reasons. The line leads might be too small, so try using larger leads. Alternatively, the line voltage might be low, so check the line voltage.
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Nicholas LewisAug 26, 2025
What causes the fan to stop working on a Thermal Arc Welding System?
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  Christopher VelasquezAug 26, 2025
  If the fan in your Thermal Arc Welding System isn't operating, consider these potential causes: * The motor may have failed, requiring replacement or repair. * There might be a broken lead or connection to the fan motor, which needs wiring repair. * A circuit breaker on the rear panel of the welding machine may have blown; try resetting it, and ensure the 115-volt receptacle isn't overloaded.
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Eric JohnstonAug 27, 2025
What causes the line contactor to fail to close on a Thermal Arc Welding System?
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  Kristen ClarkAug 28, 2025
  If the line contactor fails to close on your Thermal Arc Welding System, it could be due to a defective NVR coil, which would need replacement. There might also be a mechanical obstruction on the contactor that needs to be removed. Finally, check for broken leads at the line contactor and repair them if necessary.
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Megan CabreraAug 30, 2025
What to do if Thermal Arc EXCEL-ARC 750 CC doesn't deliver welding current even though contactor operates?
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  Jennifer ColeAug 30, 2025
  If the solid-state contactor operates, but the Thermal Arc Welding System doesn't deliver welding current, and open circuit voltage is present at the output when the gun switch is depressed, check for the following: Ensure there are ground connections at the work and that the welding cables are properly connected.
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James AyersSep 1, 2025
Why does the contactor blow link fuses on my Thermal Arc EXCEL-ARC 750 CC?
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  morgan88Sep 1, 2025
  If the contactor operates and blows link fuses on your Thermal Arc Welding System, here are some things to check: Verify that you are using the correct line voltage by checking the nameplate of the welding machine and comparing it to your line voltage. Ensure the links on the voltage changeover board are correctly connected by referring to the Voltage Changeover diagrams. Make sure the line fuse is the proper size. Remove any short circuits in primary connections. If a transformer failed, repair or replace it.
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Michael MurraySep 4, 2025
Why does the operator get a shock from Thermal Arc Welding System?
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  Kimberly WhiteSep 4, 2025
  If touching the Thermal Arc Welding System case, ground cable, work, or work table results in a shock, it indicates a grounding issue. Ensure the welding machine case is properly grounded. Also, ground the work table and the work itself to the plant ground.
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Miguel VasquezSep 6, 2025
What to do if voltage/amps dial does not control welding voltage on Thermal Arc Welding System?
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  Stephanie WillisSep 6, 2025
  If the voltage/amps dial on your Thermal Arc Welding System isn't controlling the welding voltage, it could be due to a few reasons. The potentiometer might be burned out and need replacement. Check for loose connections in the voltage control circuit and secure them. A control circuit board failure could also be the cause, requiring replacement of the control board.
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duncanpeterSep 8, 2025
What causes the output of a Thermal Arc EXCEL-ARC 750 CC to go to maximum with no control?
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  Melissa ThomasSep 8, 2025
  If your Thermal Arc Welding Machine output goes to maximum and there is no control, connect voltage sensing lead. Add jumpers JP-2 and JP-4 on Control P.C. Board.

Thermal Arc EXCEL-ARC 750 CC Specifications

General

Input Frequency	50/60 Hz
Output Voltage Range	10-40 V
Efficiency	85%
Power Factor	0.93
Protection Class	IP23
Input Phase	1/3
Rated Output	750 A at 60% Duty Cycle
Duty Cycle	60% at 750 A
Welding Processes	Stick, TIG, MIG
Weight	150 kg