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ALTERNATOR DESCRIPTION The 15 kW through 30 kW alternators are four-pole, revolving field, brushless exciter, 1800rpm modelsof drip-proof construction. Alternator design includes both single and three-phase, 60 hertz type alternators. The alternator rotor is fastened to the gear case by the rotor through-stud which passes through the rotor shaft, Figure 40. The end bell and stator housing are attached by four through-studs which pass through the stator assembly to the gear case alternator adapter. The brushless exciter stator mounts in the end bell while the exciter rotor and its rotating rectifier assemblies mount on the alternator rotor shaft. The shaft is supported at both ends by lubricated ball bearings. A centrifugal blower on the drive end of the alternator draws air through the alternator for cooling. The complete alternator includes a built-in exciter and voltage regulator, mounting feet, lifting eye, PTO ALTERNATORS ORIGINAL EQUIPMENT MANUFACTURERS PRODUCTS Onan manufactures several versions of YD PTO alternators which are sold nationally under other brand names. The major difference in these units are location of control components and the form of mounting hardware. 37 mounted gear box and splined driveshaft and control box, which includes voltmeter and a full output load Plug- Control Box The control box includes the voltage regulator, voltmeter, 15 amp duplex receptacle with circuit breaker, 50 amp welder receptacle with circuit breakers, a full output load connector with load circuit breakers, and a field circuit breaker. The load circuit breakers can be used as an onoff switch. Alternator power must feed into the farm electrical system through an approved double throw load transfer switch. Gear Box The gear box and alternator adapter contain two helical gears supported by heavy duty ball bearings. The bearings and gears are lubricated by the gear box oil. The gear box requires 1.0-pint (-47 litre) of SAE 90 EP (extreme pressure) gear lubricant.
. Starting Watts ...................... Running. Watts.. .................... Volts ............................... Phase.. ............................ Hertz .............................. Current (Amperes). ................. Power Factor ....................... Wire ............................... Brushless .......................... Alternator Speed (Nominal) ......... Tractor Speed (Nominal) ............ Minimum Horsepower Required Driving Source ................. Gear Box Oil Capacity, Pints ........ Gear Lubricant ..................... Weight ............................. Starting Watts .............................. Running Watts .............................. Volts.. ..................................... Phase ...................................... Hertz ...................................... Current (Amperes). ......................... Power Factor. .............................. Wire ....................................... Brushless .................................. Alternator Speed (Nominal) ................. Tractor Speed (Nominal) .................... Minimum Horsepower . . Required, Driving Source ................................. Gear Box Oil Capacity, Pints ................ Recommended Gear Lubricant .............. Weight ..................................... SPECIFICATIONS SINGLE PHASE ALTERNATORS 15.OYD-3G 37.500 . 15,000 1201240 1 60 62.5 1 .o 4 Yes 1800 540 30 1.0 Pt (0.47 litre) SAE 90 EP 354 Ibs. (161 kg) 20.OYD-3G 52,000 20,000 1 201240 1 60 83.3. 1.0 4 Yes 1800 540 35 1 .O Pt (0.47 litre) SA€ 90 EP 398 Ibs. (181 kg) THREE PHASE ALTERNATORS* 20.0Y D-5D G 57,500 20,000 1201240 3 60 60.2 0.8 4 Yes 1800 540 35 1.0 Pt (0.47 litre) SAE 90 EP 423 Ibs. (192 kg) All models are CSA Certified. 'Delta wound, one phase center-tapped to deliver 120/240 volt, single-phase power in capacities to 2J3 of rated %phase kVA. 38 25.OYD-3G 62,500 25,000 120/240 1 60 104.2 1 .o 4 Yes 1800 540 45 1.0 Pt (0.47 litre) SA€ 90 EP 438 Ibs. (198 kg) 25.OYD-5DG 70,000 25,000 120/240 3 . 60 75.4 0.8 4 Yes 1800 540 45 1.0 Pt (0.47 litre) SAE 90 EP 438 Ibs. (198 kg) 30.0Y D-3G 80,000 30,000 1201240 1 60 125 1 .o 4 Yes 1800 . 540 . 55 1.0 Pt (0.47 litre) SAE 90 EP 483 Ibs. (219 kg) 30.OYD-5DG 95,000 30,000 120/240 .3 60 90.5 0.8 4 Yes 1800 540 55 1.0 Pt (0.47 litre) SAE 90 EP 512 Ibs. (232 kg) b' .
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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: ASSEMBLY 9. Torque down rotor-throu
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
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I I I I I I I I I 7 6 Et 4 3 2 I RE
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Onan Corporation 1400 73rd Avenue N
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