TROUBLESHOOTING | ||
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| Observe all Safety Guidelines detailed throughout this manual |
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PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Machine fails to hold the output | 1. | Rough or dirty commutator. |
(heat) consistently. | 2. | Brushes may be worn down to |
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| Limit. |
| 3. | Field circuit may have variable |
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| resistance connection or inter- |
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| mittent open circuit due to |
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| loose connection or broken |
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| wire. |
| 4. | Electrode lead or work lead |
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| connection may be poor. |
| 5. | Wrong grade of brushes may |
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| have been installed on gener- |
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| ator. |
| 6. | Field rheostat may be making |
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| poor contact and overheating. |
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Welder starts but fails to generate | 1. | Generator or exciter brushes |
current. |
| may be loose or missing. |
| 2. | Exciter may not be operating. |
| 3. | Field circuit of generator or |
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| exciter may be open |
| 4. | Exciter may have lost excita- |
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| tion. |
| 5. | Series field and armature cir- |
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| cuit may be |
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Welding arc is loud and spatters | 1. | Current setting may be too |
excessively. |
| high. |
| 2. Polarity may be wrong. | |
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Welding current too great or too | 1. | Exciter output low causing low |
small compared to indication on |
| output compared to dial indica- |
the dial. |
| tion. |
| 2. Operating speed too low or too | |
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| high. |
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Arc continuously pops out. | 1. | “Current Range Selector” |
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| switch may be set at an inter- |
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| mediate position. |
If all recommended possible areas of misadjustment have been checked and the problem persists,
Contact your local Lincoln Authorized Field Service Facility.
Flashing the exciter field consists of passing current through the fields using an external source of 6 to 125 volts of DC power from a storage battery or DC generator. If using a DC generator, keep the generator turned off except when actually applying the flashing current. To flash the fields:
1.Turn the welder off. Raise one exciter brush off the commutator.
2.On Lincoln welders, attach the positive lead from the external DC source to the right hand brushholder.
3.Carefully holding an insulated section of the negative lead from the DC source, touch its lug or clamp to the left hand brushholder for five seconds. Pull it away quickly to minimize arcing.
Remove the lead from the right hand brushholder, replace the brush on the commutator, start the welder and the generator voltage should build up.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
PIPELINER® 200D KUBOTA
