ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

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ARMY TM 9-6115-464-34AIR FORCE TO 35C2-3-445-2NAVY NAVFAC P-8-624-34Figure 3-7. Alternator Test Leads Installation(3) Check alternator total circuit voltage as follows:(a)Install alternator in test circuit as shown in figure 3-6.NOTEThe test circuit is identical to the alternator installation circuit. If an operationalgenerator set is available, the alternator maybe installed on it for testing. (Refer to theOperator and Unit Maintenance Manual for installation instructions.(b)With switch open, compare voltage readings at V1 and V2. The readings should be identical.NOTEWhile checking voltage at V2, check to see if the reading varies when the cable or theconnector plug on the alternator cover assembly is disturbed. This could indicateinadequate test connections which must be corrected before proceeding with the tests,(c)If voltage at V2 is low or zero, the alternator positive and negative output circuits must be tested asindicated in steps (4) and (5) below.(d)If voltage readings at V1 and V2 are identical, proceed with alternator output and voltage protectortest in step (10) below.(4) Test alternator positive output circuit as follows:(a) Check voltage at V3 as shown in figure 3-9.3-22
ARMY TM 9-6115-464-34AIR FORCE TO 35C2-3-445-2NAVY NAVFAC P-8-624-34(b) If voltage is zero, check fuse (11, figure 3-5).(c) If voltage is greater than zero, but below voltage VI in figure 3-8, check for poor circuit conditionsbetween battery positive terminal and alternator positive output terminal.(d) Correct any discrepancies before proceeding with operational tests.(e) If voltage indicated is equal to voltage V1, test alternator negative output circuit as directed in step(5) below.(5) Test alternator output circuit as follows:(a) Check voltage V4 as indicated in figure 3-10.(b) lf voltage is below voltage at V1 (figure 3-8), check for inadequate circuit conditions betweenbattery negative terminal and alternator negative output terminal.(c) Correct any discrepancies before conducting operational tests.(6) Conduct excitation voltage test as follows:(a) With voltmeter connected as in figure 3-11, close switch.(b) Voltmeter should indicate 3.5 ± 0.2 Vdc.(c) lf voltmeter indicates zero volts, test voltage regulator as directed instep (8) below.(d) lf voltmeter indication is greater than 3.7 Vdc, test for open circuit of alternator field (rotor) asdirected in step (9) below.(e) lf voltmeter indication is as specified, proceed with voltage regulator, alternator output, and voltageprotector test as outlined in step (10) below.(7) Test for faulty alternator voltage regulator as follows:(a)(b)(c)(d)(e)Remove screws (1, figure 3–5) and cover assembly (2).Disconnect voltage regulator by disconnecting and tagging the red, green and black leads.Disconnect and tag the blue and yellow output leads.Install a jumper from the GND terminal to brush terminal as shown in figure 3-12.Install alternator in test circuit as shown in figure 3-12.(f)(g)(h)(i)NOTEA means of rotating the alternator at 2000 to 3000 RPM must be provided. This testcan be performed with the alternator installed on an operational generator set, andoperating the set at rated frequency.With the alternator rotating at 2500 RPM the voltmeter should indicate 24 to 28 volts and theammeter should indicate 32 to 35 amperes.If the alternator tests satisfactorily, this indicates that the voltage regulator was faulty.If the alternator does not test satisfactorily, this indicates that the voltage regulator is good and thetrouble is in the alternator.If the regulator is faulty, remove the jumper (figure 3-12) and install a new regulator and coverassembly using the tagged leads on the old cover assembly as a guide when making connections.(8) Conduct field current test as follows:3-23
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(c)(d)(e)Pull all slack from the le
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ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

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