Honeywell HW7500E Service Manual - Page 36

ELECTRICAL DIAGNOSTICS (HW3000/L MODELS) 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 5-20R 120V Duplex Outlet #1 is Within Rated Power Specification Range s&REQUENCY$ROPS"ELOW(Z s6OLTAGE/UTPUT$ROPS"ELOW Minimum W X 123- 126V G If Minimum Rated Power #ANNOT"E!CHIEVED see Engine Diagnostics Section Alternator Check NOTE: The alternator must be at room temperature when resistance is measured. ./4%4HEALTERNATORDIAGNOSTICSREQUIREMEASUREMENTS OFLOWRESISTANCEVALUESWHICHAREBEYONDTHE CAPABILITYOFATYPICALMULTI METER 5SEONLYFORDIRECTIONALINDICATIONOFRESISTANCE For best results, use an ohmmeter capable of measuring low resistance values: Resolution: 10 milliohms !CCURACY+ 1% #HECK"RUSH!SSEMBLYFOR%XCESSIVE7EAROR$EFECT ./4%5SE#AUTION7HEN2EMOVINGAND)NSTALLING"RUSH(OLDER TO!VOID$AMAGING"RUSHES )F,ENGTH,ESSTHANMM 2EPLACE"RUSH!SSEMBLY )F,ENGTH'REATERTHANMM 6ERIFY2ESISTANCE"ETWEEN%ACH "RUSH4IPAND#ORRESPONDING4ERMINALIS,ESSTHANΩ )F2ESISTANCE/UTOF3PEC 2EPLACE"RUSH!SSEMBLY Check Alternator Winding Resistances Disconnect the Exciter Connector $ISCONNECTTHE7IRESATTHE!LTERNATOR4ERMINAL"LOCK NOTE: Each Terminal Contains Nut, Lock Washer, and Flat Washer -EASURE7INDING2ESISTANCESAS3PECIFIED"ELOW Winding Measure Resistance "ETWEEN7IRES Resistance Range Specification (Ω) Stator-X "LACK White 0.15 - 0.35 AVR Tap "ROWN "LUE 20-35% of Stator-X Resistance Exciter Yellow Yellow   Rotor Slip Rings or Slip Ring Terminals* 45 - 65 )F5SINGAN/HMMETERWITH+ELVIN"RIDGE#LIPS -EASURE2ESISTANCEATTHE3LIP2ING7IRE4ERMINALSFOR"EST2ESULTS If a Winding Resistance is Out of Spec, Replace Alternator #HECKFOR#ROSS 3HORTED7INDINGSINTHE3TATOR!SSEMBLY #HECKFOR#ONTINUITY"ETWEEN7INDINGSAS3PECIFIED"ELOW #HECKFOR#ONTINUITY "ETWEEN7INDINGS #ONTINUITY Specification 3TATOR 8"LACK AVR Tap"ROWN #ONTINUITY 3TATOR 8"LACK Either Exciter Yellow .O#ONTINUITY )F#ONTINUITYIS$IFFERENTTHAN3PECIFIED!BOVE Replace Alternator Refer to Illustrations on Page 8-5. 8-4 www.honeywellgenerators.com Honeywell Portable Electrical Generator Service Manual