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Susan BensonAug 4, 2025
What to do if Thermal Arc 500 is completely inoperative?
- CCole JohnsonAug 4, 2025
If your Thermal Arc Welding System is completely inoperative, with the digital display and fans off, and no output, here are some things to check: * Start by checking for blown input fuse or fuses. * Make sure the voltage setting on the changeover board is correct. * Check the wiring to the input terminal block and ground screw. * Ensure the front panel CONTROL POWER switch/circuit breaker is ON. * With the CONTROL POWER switch ON and power applied, check for 120 VAC power on the rear duplex. * Inspect all connections to the control boards. * Examine the wiring to the small control transformer mounted underneath the control board. Also, the circuit breaker switch or the main or display control board on the front panel might be defective.