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TROUBLESHOOTING & REPAIR |
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Observe Safety Guidelines |
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| TROUBLESHOOTING GUIDE | ||||||
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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| OUTPUT PROBLEMS |
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The Power Wave 455R does not | 1. Turn the input power off and | 1. | Perform | the | Input | Contactor | |||
have welding output. The | main | make certain the reconnect |
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input contactor CR1 is not activat- | panel is configured correctly for | 2. |
| Perform the Input Board Test. | |||||
ing. |
| the applied input voltage. |
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| 2. If the Thermal light is lit, the unit | 3. |
| Perform | the | T1 | Auxiliary | |
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| Transformer Test. |
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| may be overheated. Let the |
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| machine cool and adjust weld- | 4. | Perform | the | Input | Rectifier | ||
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| ing load and /or duty cycle to |
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| Test. |
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| coincide with the output limits of | 5. |
| Perform the Switch Board Test. | ||||
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| the machine. |
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| 6. Perform the Power Board Test. | ||||||
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| 7. The Control Board may be faulty. | ||||||
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The thermal light is lit. | The | 1. The welding application may be | 1. | One of the thermostats may be | |||||
machine regularly "overheats." | exceeding the recommended |
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| faulty. | Also | check | associated | ||
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| duty cycle and/or current limits |
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| wiring for loose or faulty con- | ||||
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| of the machine. |
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| nections. | See the Wiring | |||
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| 2. Dirt and dust may have clogged |
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| Diagram. |
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| the cooling channels inside the |
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| machine. Refer to the Maint- |
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| enance Section of this manual. |
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| 3. Air intake and exhaust louvers |
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| may be blocked due to inade- |
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| quate clearance around the |
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| machine. |
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| 4. Make sure the fan is functioning |
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| correctly. Machines above code |
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| 10500 are equipped with F.A.N. |
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| (fan as needed) circuitry. The |
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| fan runs whenever the output is |
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| enabled, whether under load or |
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| open circuit conditions. The fan |
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| also runs for a period of time |
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| (approximately 5 minutes) after |
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| the output is disabled. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
