VERIFICATION PROCEDURE (cont) - TM-55-1930-209-14P-9-4

VERIFICATION PROCEDURE (cont) - TM-55-1930-209-14P-9-4_106

VERIFICATION PROCEDURE (cont) - TM-55-1930-209-14P-9-4_108

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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TROUBLESHOOTING TESTING AND ADJUSTING POSSIBLE CAUSES VERIFICATION PROCEDURE (Continued) removed to the spade terminal that wires (26) are connected. When the ohmmeter test cables are first connected to the capacitor, a low resistance will be seen. As a charge from the ohmmeter is put on the capacitor, the resistance will go up until a constant indication of near infinite resistance is seen. 23. Open Rotating Rectifiers (CR1 Disconnect the rotating rectifiers (CR1 through CR6) by removing through CR6) the wires from exciter armature (L4) at the connections of each rectifier. Use an ohmmeter or continuity tester (8S4627) and put the negative cable to positive heat sink (E1) and positive cable to the terminal (anode) of each rectifier (CR1, CR2 and CR3). A low resistance (10 ohms or less) on ohmmeter scale (RX1) or a light with continuity tester (8S4627) must be seen. if not, the rectifier is open and must be changed. Put the positive cable of the ohmmeter or continuity tester on the negative heat sink (E2) and the negative cable on the terminal (cathode) of each rectifier (CR4, CR5 and CR6). A low resistance (10 ohms or less) on ohmmeter scale (RX1) or a light with the continuity tester must be seen. If not, the rectifier is open and must be changed. For more information, see subject, TESTING POWER RECTIFIERS AND CONTROLLED RECTIFIERS. 24. Engine RPM Too Low Check the engine rpm with tachometer of high accuracy or with E frequency meter. Make adjustments to the governor as needed to get correct engine rpm. 25. Load Too High or Not Balanced Measure the load in amperes for each phase of the generator. The ampere load must not be higher than the rating given on the name plate of the generator. If necessary, make the load smaller. Toc high load on the engine (too many kilowatts) with low voltage car be caused by a high power factor. If the power factor is near 0.3 to 1.0, a reduction of the load must be made. Make this reduction to 80% of the rating In amperes. Too much load on the generator (too many kilovolt amperes) and low voltage can be caused by low power factor. If the power factor is less than 0.8, a reduction in the load is necessary. When the load between the phases of the generator is not in. balance, low voltage can be the result. Sensing of the load on the generator (voltage sensing) is done from phase 1 to phase 2 and from phase 3 to phase 2. If the highest load is connected from phase 1 to phase 3 the indicated generator voltage will be low. 26. Voltage Level Control Setting Get the voltage level higher by making an adjustment of voltage Too Low (R2) level control (R2). See Operation and Maintenance Instructions. Check for good contact between the moving brush and the turns of wire on voltage level rheostat (R2). Paint or other material car: prevent good electrical contact between these components. Bad contact will result in low voltage when it is not possible to get an adjustment of the voltage level when moving the voltage level rheostat (R2) from the maximum to minimum setting. 67

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