Service manual

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. R&D, HOBART CHINA AMX/AM900 / 15
7.2PRESSURETRANSMITTERB3/B4
Viaairtraps(booster/washtank)compressedairwillbedirectedviaclearhosestothepressuretransmitter
booster(B3)andwashtank(B4).ThetransmitterchangestheupcomingpressureintoDCvoltagewhichwillbe
processedbythecontrolaswaterlevelmessage.
Ifthereisnofault,the
voltagevaluecanbedisplayed:
–viatheservicemenuF03filllevelbooster/F04filllevelwashtankor
–setswitchingfunction[S56]to"1"(menuU02).
Possiblefaultsseepage34
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Outputvoltage*
PressuretransmitterB3(booster)
approx.0.50V
Boosterisempty.Fillvalvewillbeactivated.
approx.0.62V
Boosterheatingwillbeswitchedon(heatinguptofillstarttemperature85°C).
approx.0.90V
Boosterisfilled.Fillvalvecloses.
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Outputvoltage*
PressuretransmitterB4(tank)–exampleAMX
approx.0.50V
Washtankisempty.
approx.0.65V
Tankheatingwillbeswitchedon.
approx.1.00V
Machineisreadyforoperation(tankisfilled).
approx.1.15V
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Withadelay‐timeof5secondsdrainpumpwillbeactivateduntilnormalwaterlevelis
reached.(ErrorUL)
approx.0.60V
Attheendoftheselfcleaningcyclewaterremainsinthewashtank.
Whenthemachinewillbeswitchedonthenexttime,"AL"errorwillbedisplayed.
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Voltagevalue*additionsforpressuretransmitterB4(tank):
Model
tankheating
ON
tankfilled
safetylevel
(UL)
AL
Negative
pressure
AMX/AM900
0.65V
(
ca.13l)
1.00V
(ca.21l)
1.30V
(ca.27l)
0.60V
 (ca.12l)
0.58V
(ca.11l)
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*Voltagevaluesmaynotbechangedbytheservice
technician(onlyoninstructionofHOBART).
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MACHINESWITHEXTERNALFILLING
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Ifexternalfillingisactivated(S20setto"1"),avoltage
regulationof0.1Vmusttakeplacewithin30seconds,after
aholdingtimeof60seconds.
OtherwisetheerrormessageFILwillbedisplayed.
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