Toro Reelmaster 5010- H - Fault 81: 48 V Key Switch Undervolt-M;G

Fault81:48VKeySwitchUndervolt—M/G
Important:Forthisfault,theterm“keyswitch”referstothe48Vdclogicpowercircuit,nottothe
ignitionswitch.
InfoCenterDisplay:
_____ FAULT#81 _____
48V LOV
FaultDescription
Akeyswitchundervoltagefaultisreportedwhenthemotor/generatorcontrollermeasuresthatthe48Vdc
logicvoltageislessthan36Vdc.
CircuitDescription
Themotor/generatorcontrollermonitorsthe48Vdclogicvoltage.
ConditionsforSettingtheFault
Themotor/generatorcontrollerdetectsthatthe48Vdclogicvoltageisbelowtheminimumof36Vdc,andhas
disabledthemotor/generator.
Note:Thisfaultcanoccurbecauseofakeyswitchissue.Therefore,ifthisfaultconditioncoincideswith
startingthemachine,inspectthekeyswitch.
RecommendedServiceActions
Step1:Verifythatthefaultrepeats.
1.ClearthesystemfaultsfromtheInfoCenter.RefertoClearingFaultsfromtheInfoCenter(page21).
2.Operatethemachine.
Pass
Thefaultdidnotrepeat.GotoReturningtheMachinetoService(page22)andfollowthestepslisted.
Note:Ifthefaultdoesnotrepeat,anisolatedeventhasoccurred.
Fail
Thefaultrepeated.GotoStep2.
Step2:Determinethetroubleshootingstrategy.
Ifonlythemotor/generatorisreportingakeyswitchundervoltfault,theproblemismorelikelytobewiththe
48Vdclogicpowerconnectiontothemotor/generator.GotoStep3.
Ifthemotor/generatorand1ormorecuttingreelmotorsarereportingakeyswitchundervoltfault,theproblem
ismorelikelytobewiththe48Vdcsystemvoltage.PerformtheRecommendedServiceActionsforfault31.
Step3:Testthepowerandgroundwiringinmainharnessconnector
P37.
Useamultimetertotesttheresistancebetweenthefollowingpairsoflocations:
308