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6. Reconnect battery cables, positive (+) cable first. Start the engine and PTO and set voltage as outlined in test (M), Voltage Adjustment. F - Testing Rotating Rectifiers Two different rectifier assemblies make up the rotating rectifier bridge assembly, Figure 4. Us- ing an accurate ohmmeter, test each CR using negative and positive polarities. Test rectifiers as follows: 1. Stop engine and PTO unit. Disconnect leads to engine starting battery, negative (-) lead first. IBWAR"G1 Accidental starting of the generator can cause severe personal injury or death. Disconnect the propulsion engine battery cables, negative (-) lead firsf, before continuing with this test procedure, 2. Disconnect all leads from assembly to be tested. 3. Connect one test lead to F1+ stud and connect other lead to CRI , CR2, and CR3 in turn; record resistance value of each rectifier. 4. Connect one lead to F2- stud and connect other lead to CR4, CR5 and CR6 in turn; record resistance value of each rectifier. 5. Reverse ohmmeter leads from steps 2 and 3 and record resistance value of each rectifier F1+ to CRI , CR2, and CR3 and F2- to CR4, CR5, and CR6. 6. All the resistance readings should be high in one test and low in the other test. If any reading is high or low in both tests, rectifier assembly is defective. Use 23 to 26 inch-lbs (26 to 29 Nom) torque when replacing nuts of Fl+ and F2-, CR1, CR2, CR3, CR4, CR5 and CR6. 7 FIGURE 4. TESTING ROTATING RECTIFIERS G - Testing Exciter Stator Test the exciter stator (Figure 5) for open or shorted windings and grounds as follows: Testing for Open or Shorted WindingsStop engine and PTO unit. Disconnect leads to engine starting battery, negative (-) lead first. -1 Accidental stafiing of the generator can cause severe personal injury or death. DIsconnect tlte propulsion engine battery cables, negative (-) lead first, before continuing with this test procedure. Disconnect F1+ and F2-exciter field leadsfrom terminal block in generator end bell. The resistance between field leads should be 12.4 ohms rt 10% at 77" F (25" C). Testing for Grounds: Stop engine and PTO unit. Disconnect leads to engine starting battery, negative (-) lead first. 1-1 Accidental starling of the gem erator can cause severe personal injury or death. Disconnect fhe propulsion engine battery cables, negative (-1 lead first, before continuing with this test procedure. Connect ohmmeter between either field lead and exciter stator laminations. Use ohmmeter set at the highest, resistance range. Resis- tance must be one megohm (1,000,000 ohms) or greater.
The preferred test is with a megger or insulation resistance meter that applies 500 VDC or more to the test leads. Readings should be 100,000 ohms or greater. F1, F2 LEADS WHEATSTONE BRIDGE OR DIGITAL OHMM€IER FIGURE 5. MEASURING EXCITER STATOR RESISTANCE H - Testing Dciter Rotor Stop engine and PTO unit. Disconnect leadsto engine starting battery, negative (-) lead first. 8 Accidental starfing of the generator can cause severe personal injury or death, Disconnect the propulsion engine battery cables, negafive (-) lead first, before continuing with these test procedure. Test the exciter rotor (Figure 6) for open or shorted windings or grounds as follows: Testing for Open orshorted Windings: Use awheatstone bridge ordigital VOM forthis test. Disconnect main rotor field leads which connect to rotating rectifier assemblies at F1+ and F2-. Disconnect lead wires from diodes CR1, CR2, CR3, CR4, CR5 and CR6. Test between exciter lead pairs TI-T2, T2-T3, and TI-T3. Resistance at 770 F (25" C) should be 645 mil- liohms f 10%. Testing for Grounds: Connect leads of ohmmeter between any CR lead and exciter rotor laminations. Use an ohmmeter set at the highest resistance range. An ohmmeter reading less than one megohm (1 ,OOO,OOO ohms) indi- cates defective ground insulation. The preferred test is with a megger or insulation resistance meter that applies 500 VDC or more to the test leads. Be sure all exciter leads are disconnected from the diodes. Readings should be 100,000 ohms or greater. .
Page 1 and 2: Caution: This document contains mix
Page 3 and 4: The following symbols in this manua
Page 5 and 6: FLOW CHART A. NO AC OUTPUT VOLTAGE
Page 7 and 8: STMT Check exciter stator winding p
Page 9: -1 Contact with high voltage can ca
Page 13 and 14: are given in Table 1 (lead length b
Page 15 and 16: L - Wiring Harness Check Stop engin
Page 17: T I I I I I I I - I I I I I I I I I
Page 21 and 22: GENERAL This manual contains troubl
Page 23 and 24: generator adapter. The brushless ex
Page 25 and 26: Is control panel field breaker CB21
Page 27 and 28: FLOW CHART D. AC OUTPUT VOLTAGE BUI
Page 29 and 30: GENERAL All of the following Adjust
Page 31 and 32: . FIGURE 6. MSHlNGTHEFiELD voltage
Page 33 and 34: MULTIMETER FIGURE 11. SCR VOLTAGE T
Page 35 and 36: TABLE 2 RESISTANCE VALUES FOR ROTOR
Page 37 and 38: VOLTAGE REGULATOR The line-voltage
Page 39 and 40: VI v2 v3 v4 - VI v2 v4 VI v2 \R v4
Page 41 and 42: START Is control panel field breake
Page 43 and 44: . FLOW CHART D. EXCITER FIELD BREAK
Page 45 and 46: GENERAL All of the following Adjust
Page 47 and 48: The winding schematic (Figure 25) s
Page 49 and 50: CONTACT ONE PROD TO EACE OF M E FIE
Page 51 and 52: [a1 RECONNECTION WIRE W12 Figure 36
Page 53 and 54: 1201240 VOLT, 1 PHASE, 60 HERTZ NAM
Page 55 and 56: ASSEMBLY 9. Torque down rotor-throu
Page 57 and 58: . Starting Watts ..................
Page 59 and 60: WIRING CONNECTIONS, 15-25 kW SINGLE
Page 61 and 62:
PERIODIC SERVICE AND INSPECTION SER
Page 63 and 64:
I I I I CYRZI-2 I 7821-1 I - I t I
Page 65 and 66:
NOTE: For detailed troubleshooting
Page 67 and 68:
3. Removesix5/16x l-inch capscrewsa
Page 69 and 70:
4. Remove end bell by tapping upwar
Page 71 and 72:
9. Remove rotor and fan .by using a
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14. If bearing, shaft, or oil seal
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AC .AMMETERS WATER TEMPERATURE GAU
Page 77 and 78:
ENGINE CONTROL SYST.EM OPERATION De
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Umlt cranking 15 to 20reconds to co
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RADIATOR-COOLED DIESEL SETS The con
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Start-Disconnect Sequence When cran
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a a W a 9 W z f 66 6 b w a 3 0 E
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START Does fuel transfer pump El an
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CONTROL COMPONENT CHECKOUT The foll
Page 91 and 92:
WIRING DIAGRAMS The wiring and sche
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I I I L I I m 74
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I 1 ' t I I U
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IW I- CE o_ u) z I It I 3 w
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I I I I I I I I 3 $1 :I a 1 I I tl
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P 83
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- --1 I" .- I . I - 1 85
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87 ~ " - .I \ e 6 a i- z 0 0 a E a
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I I I I I I I I I 7 6 Et 4 3 2 I RE
Page 111:
Onan Corporation 1400 73rd Avenue N
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Caution: This document contains mixed page sizes ... - Igor Chudov

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