TM5-6115-593-34NAVFAC P-8-631-34TO-35C2-3-463-2NOTENo attempt should be made to unbolt andseparate the parts of the rotor. Breaking themagnetic circuit would alter the permanentmagnets, reducing their strength.Reassembling the rotor would not restorethe magnetism to its prior state.11-8.ROTATING RECTIFIER. The rotating rectifierassembly is part of the exciter rotor. (See figure 11-13.)The rotating rectifier assembly consists of a full waverectifier bridge made up of six semiconductor devicesmounted on aluminum heat sinks. Rectifiers are retainedin the heat sink assemblies with retaining nuts andwashers.a.Inspection. Check wiring for looseconnections and diodes for looseness inframe.b.Test. Remove cover (20, figure 11-3) togain access to the rotating rectifierassembly on exciter rotor (38).(1) Disconnect lead from diode undertest.(2) Refer to figure 11-14, thenconnect ohmmeter leads across rectifier inone direction. Note meter reading.Reverse leads and note meterreading. The meter should indicate a lowresistance when leads are across rectifier inone direction and a high resistance whenleads are across rectifier in the otherdirection.(3)If the meter indicates a low resistance inboth directions, the rectifier is shorted. Ahigh resistance in both directions indicatesan open rectifier.(4) Check resistance of surge protector(varistor) when disconnected from one sideof generator field. Value should be 1megohm or more in each direction. Checkto be sure no physical damage is evidenton the surge protector.c.Replacement.(1) Removal. Remove the rotating rectifierassembly as follows:(a) Remove cover (30, figure 11-3) byremoving screws (26 and 28),washers (29), and nuts (27).(b) Disconnect leads from (+) and (-)terminals located on the heat sinksof the rotating rectifier assembly.Figure 11-13. Rotating Rectifier Assembly11-24
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