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TROUBLESHOOTING & REPAIR | ||||||
TROUBLESHOOTING GUIDE |
| Observe Safety Guidelines | ||||
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| 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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| FEEDING PROBLEMS |
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| When the gun trigger is activated | 1. Check to see if the drive rolls | 1. With the gun trigger circuit acti- | |||
| there is no wire feed. |
| are turning when the gun trigger | vated (see the Wiring Diagram) | ||
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| is pulled. If the drive rolls are | and the | ||
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| turning, then check for a | voltage operation, check the | ||
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| mechanical restriction in the | presence of 2.6 to 27.4VDC at | ||
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| wire feed path. | leads 550+ to | ||
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| voltage that is applied to the | ||
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| 2. If the drive rolls do not turn | wire drive motor. This voltage | ||
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| then check to make sure the | is dependent upon the wire | ||
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| correct DC voltage is being | feed speed setting. |
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| applied to the |
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| 110VDC). | 2. If the correct voltage is being | ||
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| applied to the drive motor and | ||
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| 3. Make sure the gun trigger is | the motor does not run the | ||
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| functioning correctly. | motor or motor brushes may be | ||
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| faulty. |
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| 3. If the correct voltage is not | ||
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| being applied to the drive | ||
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| motor the Control Board may | ||
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| be faulty. |
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| The wire feeds for a short period | 1. The drive motor may be over- | 1. Check the motor armature cur- | |||
| of time but then stops feeding. | loaded. Check the wire feed- | rent through either of the arma- | |||
| When the gun trigger is released | ing path for mechanical restric- | ture leads (550 or 551). | It | ||
| then | tions. | should not exceed 3.5 amps | |||
| feeding but soon stops again. |
| DC. |
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| 2. While welding make certain the |
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| power source arc voltage is | 2. If more than 3.5 amps is indi- | ||
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| staying above 15VDC. The | cated, then the motor is draw- | ||
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| feeder will not function properly | ing too much current. Check or | ||
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| on less than 15VDC. | replace the motor brushes. | ||
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| 3. If less than 3.5 amps is indicat- | ||
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| ed and the motor is being dis- | ||
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| abled by the Control Board, | ||
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| then the Control Board may be | ||
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| faulty. Replace. |
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| 4. The motor or gearbox may be | ||
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| faulty. Replace. |
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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, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
