FLASHING THE FIELD

PROCEDURE FOR FIRST OPERATION AFTER REPAIR

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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FLASHING THE FIELD TESTING AND ADJUSTING FLASHING THE FIELD If the generator rotating field (L5) or the exciter field (L3) have a loss of residual magnetism. the magnetism can be put back by "flashing" the exciter field winding with a direct current 6 volt source. This source can be a 6 volt battery or a stationary battery charger. DYNAMIC FLASHING (ENGINE RUNNING) With the engine stopped, connect a voltmeter (one with a high degree of accuracy) to terminals (20 and 22). Connect the positive "+" cable of the six volt source to terminal (F1). Start the engine and run at low idle rpm. Put the negative cable of the six volt source on terminal (F2) while reading the voltmeter. As soon as the voltmeter has an indication, remove the negative cable from terminal (F2). NOTE: If the negative cable of the DC source is held on terminal (F2) too long, the generator voltage can become too high and cause fuse (F1) to open. An ON-OFF switch in the DC source makes the work safer and easier. If a battery is the 6 volt source, a blocking diode in series with the battery decreases the chance of blowing (opening) the fuse (F1). FLASHING WITH ENGINE STOPPED (STATIC FLASHING) With the engine stopped, disconnect exciter filed (L3) wires; (F1) from terminal (F1) and (F2) from terminal (F2). Connect the positive “+” cable of the six volt source to wire (F1). Put the negative “-“ cable from the source and wire (F2) together for a moment, (two or three times). DO NOT HOLD THEM TOGETHER FOR MORE THAN ONE OR TWO SECONDS. NOTE: According to theory, this method has the effect of putting residual magnetism back in the exciter field. A more practical method is to flash the field with the engine running. This is dynamic flashing. 80

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