Hobart 5T28-600CL - User Manual

Questions and Answers

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Scott SwansonAug 5, 2025
How to troubleshoot a Hobart 5T28-600CL Transformer machine that will not start?
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  Thomas ScottAug 5, 2025
  If your Hobart Transformer machine won't start, there are several potential causes: * The input power may be turned OFF at the remote disconnect switch. To solve this, turn the power ON at the remote disconnect switch. * There might be a blown fuse in the remote disconnect switch. Replace the blown fuse. If the fuse blows frequently, determine and fix the underlying cause. * There could be incorrect input power connections at the machine. Check the input power connections against the appropriate connection diagram. * The power input (frequency and voltage) might be incorrect. Ensure the voltage and frequency of the power input match the rating on the machine's nameplate. * A broken input cable could be the issue. Repair the cable as needed.
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Dale WilsonAug 13, 2025
Why does the line contactor fail to close on my Hobart 5T28-600CL?
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  Rachel FloydAug 13, 2025
  If the line contactor fails to close on your Hobart Transformer, here are a few things to check: * The line contactor fuse F8 may be blown. Replace the fuse. If the fuse blows frequently, check for the cause. * There might be a mechanical obstruction on the contactor. Remove any obstruction. * The line contactor switch could be defective. Replace the line contactor switch. * The coil in the line contactor might be defective. Replace the contactor if the coil is open or shorted. * A cable could be broken at the line contactor. Repair the broken cable as necessary.
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Anne HopkinsAug 21, 2025
How to fix high output voltage on Hobart 5T28-600CL Transformer?
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  Jennifer SmithAug 22, 2025
  If the output voltage of your Hobart Transformer is too high (above 32 Volts), consider these causes: * The voltage calibration might be off. Attempt calibration. If calibration isn’t possible, replace the PC control board. * The voltage sensing lead could be open. Repair or replace the voltage-sensing lead.
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Caitlin KingAug 26, 2025
What causes unstable voltage in a Hobart Transformer?
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  Christopher GibsonAug 27, 2025
  If you're experiencing unstable voltage with your Hobart Transformer, here are potential causes and solutions: * An open filter capacitor. Find and replace the defective capacitor. * One or more SCRs not firing properly. Adjust the balance control or replace the defective SCR heat sink assembly if an oscilloscope shows faulty SCR devices. Replace PC control boards if the oscilloscope shows no gate pulse and the PC control board inputs and controls are proper except for output.
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Anthony MartinezAug 30, 2025
What to do if operator gets a shock from Hobart 5T28-600CL?
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  Tammy Dougherty MDAug 31, 2025
  If an operator receives a shock when touching the Hobart Transformer machine case, it's likely due to the case not being grounded. Ground the machine case to an earth-type ground if the utility ground is already connected. Connect the normal safety ground and recheck if the 'utility' ground had not been connected.
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Cheryl ReyesNov 8, 2025
What to do if Hobart 5T28-600CL Transformer delivers power but soon shuts down?
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  kimberlyknoxNov 8, 2025
  If your Hobart Transformer unit delivers power but soon shuts down due to thermal overload, electronic overload, or over-voltage circuit trips, consider these potential causes: * The power supply might be overloaded. Reduce the load, as overload can only be sustained for a short time. * The duty cycle may be too high. Avoid continuous operation at overload currents. * The ambient temperature could be too high. Operate at reduced loads when the temperature exceeds 104° F (40° C), or improve the cooling ambient. * Ventilation might be blocked. Ensure that air intake and exhaust openings are not obstructed. * The fan may not be operating. Check fuse F1 on the fan shroud. If the fuse is good, disconnect the fan motor leads and apply 115 VAC directly to the fan motor. Replace the fan...
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johnsonjoshuaNov 17, 2025
Why won't the output contactor close on my Hobart 5T28-600CL?
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  Tracy Dalton MDNov 17, 2025
  If the output contactor of your Hobart Transformer will not close, consider the following: * The output switch (S2) may be defective. With the unit off, place a jumper between terminals 2 and 4 on S2. Turn the unit on. If the output contactor closes, S2 is defective and should be replaced. * The input contactor auxiliary contacts (K1) may be defective. With the unit off, place a jumper between terminals NO 1 and COM 3 on the input contactor. Turn the unit on, and place S2 in the Close position. If the output contactor closes, K1 is defective and should be replaced. * The output voltage select switch (S103) may be defective (if applicable). With the unit off, place a jumper between terminals 4 and 5 on S103. Turn the unit on, and place S2 in the Close position. If the output contacto...