JM POSNER SQ2 - Control Panel Information

10
IMPORTANT INFORMATION ABOUT THE
CONTROL PANEL
Thecontrolsystemswitchesthechocolateheateronandoffsoastomaintainthe
temperatureatapre-setlevel,andswitchesthemotoronandoffasrequired.
ThereisatwodigitLEDdisplaytoindicatethetemperatureindegreesCentigrade,and
alsotwoindividualLEDindicatorswhichlightwhentheheaterandmotorrespectivelyare
on.Amembraneswitchpanelhasapairofpush-buttonswitchesforUP( + )andDOWN
( - )tocontrolthetemperature,andathirdpush-buttoncommandstheON/OFFstateof
themotor.
1) SETTING THE TEMPERATURE
Wheneitherofthe( + ) or( - )push-buttonsispressedthesystementersthetemperature
settingmodeandthedisplayshowstheexistingunchangedsetpointtemperature.The
twodisplaydecimalpointsashonalternatelytoconrmthatthetemperaturesetting
modeisenabled.Furtherpressesofthe( + ) or( - )push-buttonscausethetemperature
tobeincreasedordecreasedrespectivelyby1°Catatime,butifeitherpush-buttonis
heldforlongerthantwosecondsthetemperatureisraisedorloweredcontinuouslyata
rateof3°Cpersecondforaslongasthepushbuttonisheld.Ifthetemperaturereaches
99°C,furtheruseofthe( + )push-buttoncannotalterthetemperaturefurthernorifthe
temperaturereaches0°Cthe( - )push-buttonwillnotehaveanyeffect(notethatsetting
atemperaturebelowtheambienttemperatureisirrelevantasthesystemonlyhasa
heater).
Ifneitherpush-buttonisoperatedforlongerthanthreeseconds,thesystemautomatically
comesoutofthetemperaturesettingmodeandtheashinglightturnsoff.Atthesame
timethenalsettemperaturevalue(TSET)isstored,thistemperaturesettingwillbeused
whenthefountainisnextswitchedon.
2) TEMPERATURE CONTROL
Whenthefountainisswitchedon,theheaterisalwaysintheONstateinitially,andthe
HeaterLEDisilluminated.Thetemperaturewilluctuatearoundyoursettemperature,
thusthehysteresisbandis2°C.Ifthetemperaturesensorfails,orisun-pluggedfromthe
controlboard,theheaterandthemotorarebothswitchedOFF,andthedisplayshows
‘SF’(SensorFault).
3) MOTOR CONTROL
Whenthefountainisswitchedon,themotorisalwaysintheOFFstateinitially,andthe
MotorLEDisoff.ThemotorsubsequentlyrunsONwhenthe( ON )push-buttonispressed,
andtheMotorLEDisilluminated.Subsequentoperationofthe( ON / OFF )push-button
togglesthemotorandindicatorbetweentheONandOFFstates.
However,ifwhenthemotorissettobe( ON )themotorwillonlystartwhentheactual
temperaturegetstowithin10°Cofthetemperaturesetusingthecontrolpanel(eg.
Fountainsetat80°Cmotorwillonlyfunctionwhenactualtemperaturereaches70°C).In
thisevent,thedisplayshows‘LT’(Lowtemperature)fortwosecondsbeforeitrevertsto
thenormaltemperatureindication.Thisistominimizepossibleoverheatingofthemotor,
asthereisariskoftheAugerbeinglockedduetosolidchocolate.
Themotoralsohasabuilt-inthermalswitchwhichopensifitstemperatureexceedsa
safelimit.Thisswitchconnectsbacktothecontrollertooverridenormalmotoroperation.
WheneverthethermalswitchisopenthemotordriveissettoOFF,andthedisplayshows
‘OL’(Over-Load)untilthemotorhascooledsufcientlytoresetthethermalswitch.The
motorcanthenbere-startedmanuallybyusingthe( ON / OFF )push-button.