Honeywell HW7500E Service Manual - Page 40

ELECTRICAL DIAGNOSTICS (ALL MODELS EXCEPT HW3000/L) Rated Power Check (Low Power Output) NOTE: At high-altitudes, standard carburetor air-fuel mixture will be rich causing a decrease in engine performance and an increase in fuel consumption. NOTE: At this time, a high-altitude carburetor kit is not available. Start Engine and Add Resistive Loads Until One of the Following Occurs: s0OWER/UTPUTat the NEMA L14-30R 240V Receptacle is Within Rated Power Specification Range s&REQUENCY$ROPS"ELOW(Z s6OLTAGE/UTPUT$ROPS"ELOW Minimum 228- G 252V X Y 114126V W 114126V If Minimum Rated Power #ANNOT"E!CHIEVED SEE%NGINE$IAGNOSTICS3ECTION Alternator Check NOTE: The alternator must be at room temperature when resistance is measured. ./4%4HEALTERNATORDIAGNOSTICSREQUIREMEASUREMENTSOFLOWRESISTANCE VALUESWHICHAREBEYONDTHECAPABILITYOFATYPICALMULTI METER 5SEONLYFORDIRECTIONALINDICATIONOFRESISTANCE For best results, use an ohmmeter capable of measuring low resistance values: Resolution: 10 milliohms !CCURACY+ 1% #HECK"RUSH!SSEMBLYFOR%XCESSIVE7EAROR$EFECT ./4%5SE#AUTION7HEN2EMOVINGAND)NSTALLING"RUSH(OLDERTO!VOID$AMAGING"RUSHES )F,ENGTH,ESSTHANMM 2EPLACE"RUSH!SSEMBLY )F,ENGTH'REATERTHANMM 6ERIFY2ESISTANCE"ETWEEN%ACH "RUSH4IPAND#ORRESPONDING4ERMINALIS,ESSTHANΩ )F2ESISTANCE/UTOF3PEC 2EPLACE"RUSH!SSEMBLY Winding Stator-X Stator-Y Check Alternator Winding Resistances $ISCONNECTTHE%XCITER#ONNECTOR $ISCONNECTTHE&UEL#UTOUT7INDING#ONNECTOR $ISCONNECTTHE7IRESATTHE!LTERNATOR4ERMINAL"LOCK NOTE: Each Terminal Contains Nut, Lock Washer, and Flat Washer -EASURE7INDING2ESISTANCESAS3PECIFIED"ELOW Resistance Range Specification (Ω) Measure Resistance "ETWEEN7IRES (7, (7, (7%, (7%, (7, (7%, Red White "LUE "ROWN   AVR Tap Green White  OF3TATOR 82ESISTANCE Exciter Fuel Cutout Rotor "LUE "LUE       "ROWN "ROWN       Slip Rings or Slip Ring Terminals*       )F5SINGAN/HMMETERWITH+ELVIN"RIDGE#LIPS -EASURE2ESISTANCEATTHE3LIP2ING7IRE4ERMINALSFOR"EST2ESULTS If a Winding Resistance is Out of Spec, Replace Alternator 1.3 - 1.8     #HECKFOR#ROSS 3HORTED7INDINGSINTHE3TATOR!SSEMBLY #HECKFOR#ONTINUITY"ETWEEN7INDINGSAS3PECIFIED"ELOW #HECKFOR#ONTINUITY "ETWEEN7INDINGS #ONTINUITY Specification Stator-X Red Stator-Y White .O#ONTINUITY Stator-X Red AVR Tap Green #ONTINUITY Stator-Y White AVR Tap Green .O#ONTINUITY Stator-X Red %ITHER%XCITER"LUE .O#ONTINUITY Stator-Y White %ITHER%XCITER"LUE .O#ONTINUITY Stator-X Red %ITHER&UEL#UTOUT"ROWN .O#ONTINUITY Stator-Y White %ITHER&UEL#UTOUT"ROWN .O#ONTINUITY %ITHER%XCITER"LUE %ITHER&UEL#UTOUT"ROWN .O#ONTINUITY )F#ONTINUITYIS$IFFERENTTHAN3PECIFIED!BOVE Replace Alternator Refer to Illustrations on Page 8-9. 8-8 www.honeywellgenerators.com Honeywell Portable Electrical Generator Service Manual