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Mountingandwiring

3.5 Powersupply

ThispowersupplyunitisequippedwithanI/Ointerface,whichpermitsconnectionoftheBeckhoffBus

Terminals.Thepowerissuppliedviatheupperspringloadedterminalslabelled“24V”and“0V”.

ThesupplyvoltagesuppliestheCXsystemanttheterminalBusandBusTerminalwithavoltageof24VDC

(15%/+20%).Thedielectricstrengthofthepowersupplyunitis500V

rms

.SincetheTerminalBus(Kand

Ebus)onlytransfersdata,aseparatepowersupplyisrequiredfortheBusTerminals.Thisisprovidedby

meansofthepowercontacts,whicharenotconnectedtothepowersupply.

Requirementsforthe24Vpowersupply

InordertoguaranteetheoperationoftheCPU(CX20x0module)andtheterminalstrandinallcases,the

powersupplymustsupply4Aat24V.

Theterminalsareimplementedinspringforcetechnology.Connectthecablesasfollows:

1. Openaspringloadedterminalbyslightlypushingwithascrewdriverorarodintothesquareopening

abovetheterminal.

2. Thewirecannowbeinsertedintotheroundterminalopeningwithoutanyforce.

3. Theterminalclosesautomaticallywhenthepressureisreleased,holdingthewiresecurelyand

permanently.

CX2020,CX2030,CX2040 25Version1.2

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Beckhoff CX2020 Manual do Utilizador Página 25