TROUBLESHOOTING
TROUBLESHOOTING GUIDE
TIG WELDING
Observe Safety Guidelines detailed throughout this manual.
SYMPTOM |
| CAUSE AND REMEDY |
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Machine does not respond (no gas flow, no | 1. | Defective Arc Start Switch or Amptrol. Check for con- |
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high frequency, no open circuit voltage) when |
| tinuity between pins D and E on cable connector when Arc |
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Arc Start Switch or Amptrol is pressed. |
| Start Switch or Amptrol is pressed. |
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| 2. | Defective Protection PC board. Replace. |
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| 3. | Defective Control PC board. Replace. |
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No gas or water flow when Arc Start Switch | 1. | Gas supply is empty or not turned on. |
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is closed in TIG mode. | 2. | Pinched gas or water hose. |
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| 3. | Gas and High Frequency fuse (F2) blown. Replace fuse. |
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| 4. | Gas and High Frequency fuse (F2) is too small. Use 1.5 amp |
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| fuse. |
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| 5. | Gas and water lines or solenoids are blocked with dirt. Clean |
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| out and use filters to prevent recurrence. |
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| 6. | Power PC board is defective. Replace. |
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No High Frequency. | 1. | High Frequency switch S12 must be in either START or |
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| CONTINUOUS position for high frequency to function. |
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| 2. | Preflow control is set too long. Reduce Preflow setting. (High |
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| Frequency does not come on until end of preflow period.) |
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| 3. | Gas and High Frequency fuse (F2) blown. Replace fuse F2. |
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| 4. | Gas and High Frequency fuse (F2) is too small. Use 1.5 amp |
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| fuse. |
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| 5. | Spark Gap is too large. Set to gap specified on cover plate. |
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| 6. | Power PC board is defective. Replace. |
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Weak high frequency. | 1. | Spark gap is set too close. Set to 0.015 inches (0.381 mm) |
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| gap for most applications. |
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| 2. | High Frequency Intensity control set too low. Increase to suit. |
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| 3. | Work and electrode cables in poor condition, allowing high |
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| frequency to “leak” to ground. Use good quality cables, |
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| preferably those with a high natural rubber content, as short |
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| as possible. |
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| 4. | No shielding gas. Adjust gas flow for 10 to 30 CFH (4.7 to |
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| 14.1 l/min.) for most applications. (High frequency will not |
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| jump from the tungsten to the work without shielding gas.) |
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Machine shuts down (pilot light goes out | 1. | If open circuit voltage is greater than 80 volts before shut- |
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and fans stop) when Arc Start Switch or |
| down occurs, Control PC board is defective. Replace. |
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Amptrol is pressed. |
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Cannot preset a current on Ammeter when the | 1. | Defective Arc Start Switch. There should be no continuity |
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Arc Start Switch or Amptrol is not pressed. |
| between pins D and E of cable connector when Arc Start |
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| Switch or Amptrol is not pressed. |
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| 2. | Defective Current Control potentiometer. Replace. |
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| 3. | Defective Control PC board. Replace. |
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| 4. | Defective Feedthrough PC board. Replace. |
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SQUARE WAVE TIG 355
