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THEORY OF OPERATION | ||
| FIGURE E.6 — GENERATOR & EXCITER |
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| ENGINE |
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| CONTROL/PROTECTION |
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| MODULE |
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| SELECTOR |
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| SWITCH |
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| 90 Min. |
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| NEGATIVE |
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| OUTPUT | |
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| Current |
| TERMINAL |
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| Max | Sensing |
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| P.C. Board |
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| SERIES |
| RESIDUAL |
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| COILS |
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| _ | MAGNETISM |
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| SHUNT |
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| BRUSHES | COMMUTATOR |
| FIELD |
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| - |
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| GENERATOR |
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MECHANICAL | & | ARMATURE | DC |
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COUPLING | ARMATURE | SHAFT | EXCITER |
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| ARMATURE |
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| + | SERIES | 15 AMP |
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| FUSE |
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| SHUNT | INTERPOLE |
| FIELD |
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| FIELD | COILS |
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| COILS |
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| RECEPTACLE |
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| 120VDC |
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| GENERATOR |
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| FIELD CONTROL |
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| + | POSITIVE |
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| OUTPUT | |
ENGINE, MAIN GENERATOR ARMATURE |
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| TERMINAL | ||||
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& FRAME AND DC EXCITER |
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| ENGINE, MAIN GENERATOR ARMATURE, FRAME | |||
EXCITATION (FLASHING) |
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| & DC EXCITER |
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The main generator armature and the exciter armature | CURRENT RANGE SELECTOR | ||||||
are mechanically coupled to the engine. When the | |||||||
engine is started and running, the residual magnetism | The selector switch acts as a course current adjust- | ||||||
that is stored in the exciter pole pieces is induced upon | |||||||
the exciter armature. This causes the exciter to “build- | ment by allowing varying amounts of series windings to | ||||||
up” and produce a DC output voltage. | This DC is | be included in the welding current path. The series | |||||
applied, via the field rheostat control, to the main gen- | coils and selector switch are connected in series with | ||||||
erator shunt field coils. The exciter output is also con- | the negative output terminal. | ||||||
nected to the 120VDC receptacle. |
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| FINE CURRENT ADJUSTMENT | |||
MAIN SHUNT, INTERPOLE & SERIES COILS | The field rheostat control functions as a fine output cur- | ||||||
The generator armature rotates within the magnetic | rent adjustment by controlling the current through the | ||||||
field created by the shunt field windings. A DC voltage | shunt windings, thus controlling the amount of magnet- | ||||||
is induced in the armature and is transferred, through | ism created in the field windings. Open circuit weld | ||||||
the armature commutator and brushes, to the series | voltage can also be controlled by the field rheostat con- | ||||||
and interpole coils. The interpole coils, which are con- | trol. |
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nected in series with the positive output terminal, are |
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located so as to counteract any magnetic influences |
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that could cause mechanical distortion in the rotating |
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armature. The series coils are designed to oppose or |
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“buck” the DC voltage that is generated in the arma- |
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ture. |
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| PIPELINER® 200 |
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