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- - TEST DRY E LL BATTERY TABLE 5. TESTING RECTIFIER BRIDGE ASSEMBLY CR21 OHMUEERLEAD RECTlFIER TEmNG + - TERMINUS CR ISCR REMARKS METER SCUE 1 x + u 1 3 Infmily RXlOK X 1 3 4 5 x 1 x x + SCRl I"f#lir, RXlOK X IC1 Infmily RXlOK x ~ I I ~ v I I - CRl RXl ACI 6 X + . SCRZ lnfintly RXlOK x m r 9' lo" 6 V Ds.tu* DCVdPnckf DC VOmMn + lmd R..dh9 less lhan rrlh Ralrbr + - x ACI AC1 + SCRl ACl 1 + 3 VOID AC2 + SCRZ AC? + 3 VOID FLASHING THE FIELD If output voltage does not build up it may be necessary to restore residual magnetism by flashing the field. Assemble a &volt battery and diode as shown in Figure 24. If a &volt lantern battery is not available, a 12-volt or 24-volt generator set battery can be used. However, a 20-ohm or a &ohm, 2 watt resistor must be used in FIGURE 23. TESTING SCR 27 series respectively with the 12amp 300 Vdiode. Start the generator setand operate at normal rpm. Touch positive lead to + terminal on rectifier bridge, and negative lead to the - terminal. Hold leads on terminals just long enough for voltage to build up. CAUTION DO not keep excitation circuitry connected Ex longerthan BseconL,ordamage may occur to the exciter regulator. . RECTIFIER BRIOGE ASSEMBLY L. PLACE RESISTOR HERE FOR 12V OR 24V BATTERY 6 VOLT DRY CELL BATERY FIGURE 24. FIELD FLASHING CIRCUIT TESTING REFERENCE TRANSFORMER T21 Transformer T21 has eight leads; six are primary leads marked H1 through H6, two are secondary leads marked X1 and X2.
The winding schematic (Figure 25) shows the resistance values for the individual coils in ohms. Resist- ance between any primary and secondary leads and from any lead to transformer frameshould be infinity. vR21-9 m 531-649 OHMS Tzl x2 x1 vR21-10 FIGURE 25. T21 WINDING SCHEMATIC . . VR21 REPLACEMENT Usethe following procedure for replacing the voltage regulator PC board or VI? chassis. 1. Stop engine. 2. Disconnect and if necessary, label wires: VR21-1 through VR21-12 Refer to AC control wiring diagram. 3. Remove four screws at corners. 4. Remove old PC board. 5. Install new PC board; secure with four screws. 6. Reconnect wires removed in step 2 at proper terminals. 7. Place jumper W12 at proper terminals for your particular voltage code and voltage connection. See Test Procedure [Q]. 8. Perform voltage calibration and stability adjustment procedures to obtain the correct generator output voltageand stability with new PC board in set. TESTING ROTATING RECTIFIERS ’ Two different rectifier assemblies make up the rotat- 28 ing rectifier bridge assembly, Figure 26. Using an accurate ohmmeter, test each CR using negative and positive polarities. Test rectifiers as follows: 1. Disconnect all leads from assembly to be tested. 2. Connect one test lead to F1+ stud and connect other lead to CRl, CR2, and CR3 in turn; record resistance value of each rectifier. 3. Connect one lead to F2- stud and connect other lead to CR3, CR4 and CR5 in turn; record resistance value of each rectifier. 4. Reverse ohmmeter leads from step 2 and record resistance value of each rectifier F1+ to CRl,, CR2, and CR3 and F2- to CR4, CR5, and CR6. 5. All three resistance readings should be high in one tedand low in the other test. If any reading is high or low in both tests, rectifier assembly is . . defe,ctive. 6. Replace defective rectifier assembly with new, identical part. Use 24ibr-h. (2.7 Nom) torquewhen replacing nutsof Fl+and F2-, CRl, CR2, CR3, CR4, CRS, and CR6. CR3 FIGURE 26. TESTING ROTATING RECTIFIERS [HI TESTING EXCITER STATOR Test the exciter stator (Figure 27) for open or shorted windings and grounds as follows: Testing for Open or Shorted Windings: Disconnect F1+ and F2- exciter field leads from terminal block in generator end bell. The resistance between field leads should be 13.05 to 15.95 ohms at 77’ F (25OC). Testing for Grounds: Connect ohmmeter between either field lead and exciter stator laminations. Use ohmmeter set at RX 100 scale. An ohmmeter reading of less than infinity ( Di ) indicates defective ground insulation. c 1 -
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 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: GENERAL All of the following Adjust
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:
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Page 104 and 105:
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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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