Toro Reelmaster 5010- H - Fault 77: 48 V Key Switch Undervolt-CRM 2

Fault77:48VKeySwitchUndervolt—CRM2
Important:Forthisfault,theterm“keyswitch”referstothe48Vdclogicpowercircuit,nottothe
ignitionswitch.
Note:Whenanyindividualcuttingreelmotorisshutoffduetoafault,theTEC-5002shutsofftheother4
cuttingreelmotors.
Note:Ifmultiplemachinefaultsarereportedwithinafewseconds,troubleshootingshouldbeginwiththe
rstcuttingreelmotortoreportafault.
InfoCenterDisplay:
_____ FAULT#77 _____
48V LOV 2
FaultDescription
Akeyswitchundervoltagefaultisreportedwhenthecuttingreelmotormeasuresasystemvoltagelower
than32Vdc.
CircuitDescription
Eachcuttingunithasanelectriccuttingreelmotorthatcontainsaninternalcontroller.Theinternalcontroller
measures48Vdclogicpower,andtheelectriccuttingreelmotormeasures48Vdcbuspower.
Ifonly1cuttingreelmotorisreportingakeyswitchundervoltfault,theproblemismorelikelytobewiththe48
Vdclogicpowerconnectiontothatcuttingreelmotor.
Ifmorethan1cuttingreelmotorisreportingakeyswitchundervoltfault,theproblemismorelikelytobe
withthe48Vdcbusvoltage.
ConditionsforSettingtheFault
Cuttingreelmotor2detectsthatthe48Vdclogicvoltageisbelowtheminimumof32Vdcandsetsthisfault.
RecommendedServiceActions
Step1:Verifythatthefaultrepeats.
1.ClearthesystemfaultsfromtheInfoCenter.RefertoClearingFaultsfromtheInfoCenter(page21).
2.Operatethemachine.
Pass
Thefaultdidnotrepeat.GotoReturningtheMachinetoService(page22)andfollowthestepslisted.
Note:Ifthefaultdoesnotrepeat,anisolatedeventhasoccurred.
Fail
Thefaultrepeated.GotoStep2.
Step2:Determinethetroubleshootingstrategy.
Ifonly1cuttingreelmotorisreportingakeyswitchundervoltfault,theproblemismorelikelytobewiththe
48Vdclogicpowerconnectiontothatcuttingreelmotor.GotoStep3.
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