Caution: This document contains mixed page sizes ... - Igor Chudov

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Bench Check 3. Open switch in 120 VAC supply to VARIAC. 1. Remove voltage regulator from unit according to 4. Piug VARIAC into 120 VAC source. procedure given for voltage regulator replacement. 2. Referring to Figure 5 and Table 1, connect test equipment to the printed circuit board VR21 terminals as follows: 5. Proceed with checkout according to steps in Table 1. [El CONNECT FROM TO . FLASHING THE FIELD Jumper Jumper Lead Lead Lead Lead AC Voltmeter DC Voltmeter VARIAC R1 AC INPUT VOLTMETER VR21-V1 VR21 -V4 The following procedure is used for momentarily VR21-1 vR21-2 flashing the exciter field with a low voltage which CMR21-1 CMR21-4 vR21-10 vR21-9 restores the. residual magnetism in the alternator rotor. Flashing the field is usually necessary when T21-X1 VR21-6 installing a new brushless exciter stator wound assembly, but seldom is necessary under other T21 -X2 vR21-4 Across Across T21-H1 & H2 VR21-7 8 8 . circumstances. Always check generator residual Across T21-H1 (fused) voltage at terminals 1 and 2 to be certain whether or not flashing the field is necessary. Generator residual and H2 Across. VR21-7 h 8 TABLE 1. VOLTAGE REGULATOR CHECKOUT . I1 Ac 1m VOLT= (
. FIGURE 6. MSHlNGTHEFiELD voltage should be at least 20 VAC at rated speed. If residual is too low and the output voltage will notbuild up, flash the field as follows: Locate terminals 7(-) and 8(+) on .. voltage - regulator printed circuit board (VR21). Use a six volt dry cell battery with two clip leads anda12amp,300voltdiodeasshown in Figure6. If a six volt battery is not available, a 12 volt automotive battery can be used by adding a 20-ohm resistor in series; or a 24 volt automotive battery can be used by increasing the resistance to 40-oh ms. After starting engine, touch positive (+) battery lead to the+8, and negative (-) lead to -7 terminals . just long enough until voltage starts to build up or damage may occur to exciter-regulator system. Be cautious when worklng on a generator 1-1 that is running to avoid electrical shacks. TEST PROCEDURES All of the following tests can be petformed without disassembly of the generator. Use the following test procedures for testing generator components in con- junction with the troubleshooting charts. TESTING ROTATING RECTIFIERS Two different rectifier.gssemblies make up the rotating rectifier bridge assembly, Figure 7. Using an accurate ohmmeter, test each CR using negative and positive polarities. Test rectifiers as follows: 1. Disconnect all leads fromassembly to be tested. 12 2. 3. 4. 5. 6. - . 6 VOLT DRY CELL BATTERY ' Connect one test lead to F1+ stud and connect other lead toCR1, CR2, and CR3 in turn; record resistance value of each rectifier. Connect one lead to F2- stud and connect other lead to CR3, CR4 and CR5 in turn; record resistance value of each rectifier. Reverse ohmmeter leads from step 2 and record resistance value of each rectifier F1+ to CR1, CR2, and CR3 and F2- to CR4, CR5, and CR6. All three 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. Replace defective rectifier assembly with new, identical part. Use 24 Ibs-In. (27 Nw) toque when tightening nuts on F1+ and F2-, CR1, CR2, CR3, CR4, CRS, and CR6. FIGURE 7. TESTING ROTATING RECTIFIERS
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 and 10: -1 Contact with high voltage can ca
Page 11 and 12: The preferred test is with a megger
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: GENERAL All of the following Adjust
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
Page 73 and 74: 14. If bearing, shaft, or oil seal
Page 75 and 76: AC .AMMETERS WATER TEMPERATURE GAU
Page 77 and 78: ENGINE CONTROL SYST.EM OPERATION De
Page 79 and 80: Umlt cranking 15 to 20reconds to co
Page 81 and 82:
RADIATOR-COOLED DIESEL SETS The con
Page 83 and 84:
Start-Disconnect Sequence When cran
Page 85 and 86:
a a W a 9 W z f 66 6 b w a 3 0 E
Page 87 and 88:
START Does fuel transfer pump El an
Page 89 and 90:
CONTROL COMPONENT CHECKOUT The foll
Page 91 and 92:
WIRING DIAGRAMS The wiring and sche
Page 93 and 94:
I I I L I I m 74
Page 95 and 96:
I 1 ' t I I U
Page 97:
IW I- CE o_ u) z I It I 3 w
Page 100 and 101:
I I I I I I I I 3 $1 :I a 1 I I tl
Page 102 and 103:
P 83
Page 104 and 105:
- --1 I" .- I . I - 1 85
Page 106 and 107:
87 ~ " - .I \ e 6 a i- z 0 0 a E a
Page 108 and 109:
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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