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. a ’ . I TWO BEARING ALTERNATORS GENERAL Onan YDtwo bearing alternators 5.0 through 20.0 kW are 50 and 60 hertz units designed for belt and pulley or direct coupling to a separate prime mover. Acentrifugal bloweron the frontend of the rotorshaft circulates the alternator cooling air. The air is drawn in through the end bell cover, over the rotor, and discharged through an outlet at the blower end, Fig- ure 4.4. A ball bearing at each end supports the rotor shaft. The end bell and stator housing are attached by four- through-studs which pass through the stator assembly. The brushless exciter stator mounts in the end bell while the exciter rotor and its rotating rectifier assemblies mount on the rotor shaft. VOLTAGE REGULATOR The line voltage regulator is an all solid state device. Basic components of the voltage regulator are: Printed circuit board Voltage reference transformer T21 0 Commutating reactor CMR21 Field circuit breaker Voltage adjust rheostat (optional) Figure 45 shows the above components in a typical control on standard units. /FIELD STATOR, BREAKER 1- CONTROL JUNCTION BOX m\ I mu1 ROTOR - I 1 \ ASSEMBLIES ROTO R-SHAFT . END BELL TORQUE TO 19-21 FT. LBS (S28 Wm) flGURE 44. GENERATOR (CUTAWAY VIEW) 43 TORQUE TO 130 TO 150 FT. LBS STATOR-THROUGH-S TUD
I I I I CYRZI-2 I 7821-1 I - I t I I CURZI-3 I 7821-2 I - I I I 1 CURZI-4 I VR2l-9 I - I I I I CBZI-2 VRZ 1-1 0 TBZ I -F 1 VR21-8 yR2 1-7 14 I VRPI-V4 COY. I VPl-VI 1 15 1 VR21-1 I yR21-2 1 15 . FIGURE 45. VOLTAGE REGULATOR ASSEMBLY OPTIONAL SWITCHBOARDS Switchboards (Figure 46) are optional equipment which can be purchased at added cost. They contain a voltmeter; ammeters, line circuit breakers and marked terminals. The switchboard is used to check alternator voltage, load current and.voltage regula- tion with a varying load. When ordering parts for switchboards, obtain part numbers and description of part from the wiring dia- gram supplied with the switchboard. .. I 44 FIELD CIRCUIT BREAKER REGULATOR MOUNTING PANEL CONTROL BOX The control box (on top of the alternator) <strong>contains</strong> the voltage regulator and the lowerportion of the junction box for making alternator to load line connections. The generator output leads are accessible by remov- ing the control box cover, I KNOCK OUTS AC VOLTMETER SINGLE POLE LINE CIRCUIT BREAKERS FIGURE 46. TYPICAL WALL MOUNTING "SB" SWITCH-; BOARD - 3 PHASE, 120120a VOLTS c
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 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: PERIODIC SERVICE AND INSPECTION SER
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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