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| THEORY OF OPERATION | |||||
| Observe Safety Guidelines detailed in the beginning of this manual. |
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| PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED |
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| (SYMPTOMS) |
| MISADJUSTMENT(S) | COURSE OF ACTION |
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| The line circuit breaker trips |
| OUTPUT PROBLEMS | 1. Perform the Input Board |
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| 1. | Input power Bridge is shorted. |
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| when power switch is “ON” | 2. | Failed Electrolytic Capacitors. | Resistance Test. |
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| 3. | Failed Inverter IGBTʼs. | 2. Perform the Inverter Board |
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| Resistance Test. |
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| The machine is dead, no output, | 1. | No input power on line. | 1. Restore correct Input power |
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| no fan |
| 2. | Line Switch failure. | 2. Replace Line switch. |
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| 3. | Defective Input Board. | 3. Perform Input Board Voltage | |
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| 4. | Defective Inverter Board | 4. Perform Inverter Board |
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| Test. |
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| Voltage Test. |
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| The GREEN | LED is “ON” but | 1. Thermal Protection has | 1. Check Fan and Thermal |
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| there is no output And yellow |
| tripped. | Protection Circuits. |
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| thermal overload LED is “ON” | 2. Logic Circuit Error on Control | 2. Perform Input Board |
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| Board. | Resistance and Input Board | |
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| 3. ARFU System Damage on the | Voltage Tests |
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| Input Board | 3. The Control Board may be |
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| faulty. Replace. |
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| The YELLOW LED is “ON” and | 1. | The machine is unable to cool | 1. Turn the Power Switch OFF and | ||
| the RED and GREEN LEDʼs blink |
| itself. | wait several minutes for the |
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| alternately |
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| machine to cool. Turn the Power | |
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| Switch back ON and check for | |
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| proper fan operation. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call
