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LEW CS/CL 071
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Galletti LEW CS/CL 071 [18/56] Electric panel

Galletti LEW CS/CL 112 [18/56] Electric panel

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Page18of56

RG66006951‐Rev.01

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1.4 Electric panel

The electric panelisbuiltand wired in accordance with standardEN60204‐1.Theelectric panelisaccessedfromthe

frontofthemachine.Beforeitcanbeaccessed,theunitmustbedisconnectedfromthepowersupplyusingthemain

switch, which functions as a door‐lock. All the remote con

trols are implemented with low voltage signals at 24 V,

poweredbyanisolationtransformerpositioned insidethecontrolboard.Allthecontrolboardshavean aircirculation

systemwithauxiliaryfans.Thepositionofthemainswitchmakeswiringoperationsintheworksiteeasier.Thisavoids

severaldifficultoperatio

nsaswellashavingtotwistthepowercords.Alltheutilitiesareprotectedagainstsurgesand

short circuits. The circuit breaker set‐up can be configured for any load (optional). Thermal protection, however, is

carried out by thermistor chains. These are set in the windings of each electric motor and are controlled by onbo

ard

electronics.All machines are standard‐equipped with a phase sequence relay which inhibits compressor operation if

thephasesequenceisnotcarriedout:onlyonedirectionofrotationispossibleforscrollcompressors,aswellasforthe

screw and Rotary compressors.The unit is rated IP43 which makes it suitable fo

r outdoor installation. The control

board with the open  panel maintains an IP20 rating. Inside the electrical control board of the Basic control there are

twomanualselectorstoenableremoteswitchingon‐off,seasonalchangeover(onlyheatpumps)andtoselectlocalor

remoteco

ntrol:remoteconsentsareimplementedbyverylowvoltagecontactsplacedontheterminalboard.

1.4.1 Control microprocessor

LEWseriesunitshavetwodifferentmicroprocessorcontrollevels:

‐ Basic–CarelµChiller

‐ Advanced–CarelseriespCO

Thelatter,inadditiontothefunctionsdescribedbelow,cancustomisethesoftwaretomeetallsystemrequests.These

includecas

cademanagementoftheunitswithstep‐controlorcascadelogic.Themicroprocessoronboardtheunit

controlsthevariousoperatingparameterswithanelectricpanelkeypad;

‐ Compressorconnection/disconnectiontomaintaintheset‐pointofthechillerinletwaterT;

‐ Alarmmanagement:Hi

gh/lowpressure;Antifreeze/Flowswitch;Pumpalarm

‐ Alarmsignals

‐ Displayofoperatingparameters

‐ Evaporatoranti‐freezeprotection

‐ Controlofmaximumnumberofcompressorstarts

‐ RS232,RS485serialoutputcontrol(optional)

‐ Incorrectphasesequence(notviewedondisplay,preventsthecompressorfromstarting)

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Asforremotecommuni

cation,thecontrolscanbeconnectedtoadvancedBMSsystems.TheHSD(HiRefSoftware

Department)structureiscapableofassistingcustomersinintegrationoperations.Systeminterconnectivitycapabilities

aresummarisedbelow:

‐ Availableserialports

‐ RS232

‐ RS485

‐ Ethernet(“HiWeb”board)

‐ GSMModem:withprepaidcardandrelativ

eantennaonboardthemachineforautonomoustwo‐waycontrolof

alarmsand/orset‐pointvariations

‐ Protocols

‐ Carel [Built‐In]

‐ Modbus®[BuiltInwithAdvancedcontrols]

‐ Modbus®[WithexternalgatewaywithBasiccontrols]

‐ LonWorks®[Dedicatedserialboardtoberequestedwhenorderingthemachine]

‐ BACn

et™[Withexternalgateway]

‐ TCP‐IP [Withexternalgateway]

‐ TREND®[Dedicatedserialboardtoberequestedwhenorderingthemachine]

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(ref.Microprocessorcontrolmanualforfurtherdetails)

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Galletti LEW CS/CL 071 [18/56] Electric panel

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