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The data in this section is divided into three flow charts, and information on troubleshooting the DTA/MDTA solid-state control (page a). The flow charts consist of: A. Engine does not crank. B. Engine cranks but does not start. C. Engine starts but stops when start switch is released. Before starting a troubleshooting procedure, make a few simple checks that may expose the problem and cut down on troubleshooting time. Check all modifications, repairs, replacements performed since last satisfactoryoperation of set. A loose wire connection overlooked when instal- ling a replacement part could cause problems. An incorrect connection, an opened switch or circuit breaker, or a loose plug-in are all potential problems that can be eliminated by a visual check. Unless absolutely sure that panel instruments are accurate, use portable test meters for troubleshooting. START Is battery dead? Is LOP emergency relay K14 tripped? 1 Jumper battery cable B+ connection to 61 starker solenoid terminal. Does engine crank? With Si1 in Start position, does start solenoid K11 energize? (Is at least 7 volts DC present between K11 terminal S and ground?) Is at least 7 volts DC present between B1 starter solenoid terminal and ground? FLOW CHART A. ENGINE DOES NOT CRANK To troubleshoot a problem, start at the upper-left corner of chartand answerall questions eitherYESor NO. Followthe chart until the problem is found, per- forming referenced Control Component Checkout procedures on page 70. Refer to typical wiring diagrams in Figures 78 and 79for locating control component leads, terminals and other check points. Check for correct voltage at terminal blocks as shown below. Measure voltage between terminal and ground, or as indicated. TBll-B+. ............................................ 12 VDC TB11-1 ............................................ GROUND TBll-2 .................................... l2VDC RUNNING TBll-3 .................................... l2VDC STOPPED TB11-H .................................... l2VDC STOPPED -12-4 .................................... l2VDC RUNNING TB12-5 ................................... -12 VDC RUNNING 1612-6 .................. 0-VDC STOPPED, l2VDC RUNNING TB12-7 ......................................... 19 to 21 VAC TB21-1 to 2 .................................. .120 to 139 VAC K11-B+ .............................................. 12 VDC K11-S ............................ .7 to 9 VDC ON CRANKING K13-H ................................. 12 VDC ON PREHEAT + + Check battery per Checkout [A] and recharge or replace. (NOTE: Centrifugal switch S1 and diode CRll can cause battery discharge. See Checkouts IC] and [HI). Check engine oil level. If OK, reset relay. Check oil pressure switch S4 and related wiring. ’ + Check battery cables for clean and tight connections (ref. Checkout [B]). Check B7 starter solenoid and motor - if bad, repair or replace. Check solenoid K11, relay K12, Start/Stop switch S11 and associated wiring and connections per Checkouts PI, [El and [GI. Check wiring and connections between K11 terminal S and the solenoid terminal of 81. - - L
START Does fuel transfer pump El and solenoid K1 operate when SI 1 is in Start position? 3 Yes Is engine getting fuel? (Exhaust smoke should be blue-whiie. and fuel flow steady from fuel return I Incorrect fuel? (See Operator's Manual recommendations.) f I I L I line.) Does fuel primer solenoid K3 energize when S11 is in Start position? DIESEL ENGINE t (Also see "Onan Diesel Starting Guide," page 71) no GASOLINE - ENGINE Check relays K11, K12 and K14 per Checkouts [D] and [E]. Check wiring. Replace transfer pump El if defective. Check fuel supply system: fuel tank, shutoff valves, fuel lines and connections, fuel filters and pumps. I I Is preheat system operating properly? Is carburetor choke operation proper? I Yes ' 1 Is ample spark ignition voltage available at spark plugs? -no-, - Check c Is fuel pump OK? Does fuel pulsate from line removed at carburetor? Use extreme care for this test. Run fuel into a suitable container and make sure area is well ventilated to prevent an explosion or flre and resulting personal injury or death. 68 heater solenoid K13 and switch S12 per Checkouts [D] and [GI. Check wiring and heater elements. Check solenoid K3 and related wiring. Repair or replace as needed. Check electric choke components and wiring (if used). . Adjust per Operator's Manual instructions. I Check ignition components: points, condenser, plugs, distributor, wiring, and HETCO. Battery voltage must appear at coil during cranking. I I Check fuel supply system: fuel tank, shutoff valves, fuel lines and connections, fuel filters and pumps. I
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Caution: This document contains mix
Page 3 and 4:
The following symbols in this manua
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FLOW CHART A. NO AC OUTPUT VOLTAGE
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STMT Check exciter stator winding p
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-1 Contact with high voltage can ca
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The preferred test is with a megger
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are given in Table 1 (lead length b
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L - Wiring Harness Check Stop engin
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T I I I I I I I - I I I I I I I I I
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GENERAL This manual contains troubl
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generator adapter. The brushless ex
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Is control panel field breaker CB21
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FLOW CHART D. AC OUTPUT VOLTAGE BUI
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GENERAL All of the following Adjust
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. FIGURE 6. MSHlNGTHEFiELD voltage
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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: a a W a 9 W z f 66 6 b w a 3 0 E
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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