How to set up a single phase input device from a …

1 20141 eaton NoteAP040108 ENEffectiveMarch2015 How to set up a single phase inputdevicefrom athree phase input for your 230 Vthree phase inputcircuitIntroductionThis application notes has been designed toaid in the wiring changes and protectionrequirements whenconverting a three phase input to a single phase input for your 230V system. The PowerXL DE1 variablespeed starter is available in 230V and 460V, however the supply voltage for the 230V version is singlephase in only. It is still a three phase output device to control the three phase motors. This applicationnote will describe the wiring configuration changes and the changes in the protection considerationsIf the DE1 is installed on one leg of a three phase system, the unfiltered harmonics generated from thisdevice could cause issues with other equipment within the facility.

2 With three phase operation of a non-linear load, the tripling harmonics cancel; likewise, with two phase operation of a non-linear load, the evenharmonics cancel. However, there is no cancelation effect with single phase operation which can lead tosignificant even order and tripling harmonics. This is more of a concern where the amps drawn from thesingle phase drive constitute a significant portion of the total current drawn on that particular leg of thethree phase system. If harmonics are not properly addressed, they can affect other components on thesystem and fines can be levied against the facility by the wiringrecommendationsConnections must come from a480Y transformer on the supply sideusing one of the phases and theneutral wire.

3 The other 2 phases can be tapped off or not pulled to this section of the the casewhere a 230V Delta transformer isusedon the supply side using two phases are used. The additionalphase tapped off.(seepage17 ofDE1manualfor DE1 Supply requirements.) phase APhase CPhase BNuetral480V Wye ConnectionDE1L2/NL1/L200-240V480V480 VPhase APhase CPhase B230V Delta ConnectionDE1L2/NL1/L200-240V200-240 VNuetralPhase APhase CPhase B230V High Leg DeltaConnectionDE1L2/NL1/L200-240V200-24 0V115-120V190-208V115-120 VFigure 1. From left to right: 480 Vwyeconnection, 230 Vdeltaconnection, 230 VhighlegdeltaconnectionApplication NoteAP040108 ENThree phase to single phase input conversionEffectiveMarch20152 eaton FS1 drives, the singlephase in must be connected to L1/L and the neutral linein the case of a Wyetransformerbust be connected to L2/L as per the case of a Delta transformer L1isconnected to phase A and L2/N to phase the leftin the figure below,theL3 terminal and the RFIfilterconnection terminalare sealed off and not is shown the connection method for a singlephase configurationTable 1.

4 DE1terminaldesignationOne final point to mention on proper wiring is that the DE1 must be connected tothepower supplysystem's protective earth directly at the location of installation(system earthing). This protective earthmust not pass through any additional wiring practices should be followed as they wouldbe fora three phase , standard NoteAP040108 ENThree phase to single phase input conversionEffectiveMarch2015 eaton protection recommendationsThe same considerations are taken when sizing an upstream protection device as would be looked atwiththreephase load systems. Breakersand fusesarerecommended to besized at least 125% largerthanthe current of the downstream single phase inputdevicerequires a two pole protection asingle phase inputdevice,theinputcurrent is typically highercompared to a three phase input deviceinput current.

5 This means that theprotection device needs to take the increased current into output current matches towhat the nameplate current it on the example:230V single phase input , 2hp230V three phase input , 2hpDE1-127D0NN-N20 NInput current = x = minimum protection requiredDC1 EquivalentInputcurrent = x = minimum protection requiredPart numberHPInput current(A)Recommendedminimumprotectioncu rrent rating (A) 2. DE1 input currentdataApplication NoteAP040108 ENThree phase to single phase input conversionEffectiveMarch20154 eaton HelpIn the US or Canada:please contact the Technical Resource Center at 1-877-ETN-CAREor 1-877-326-2273option 2, option other supporting documentation is located on the eaton website eaton BoulevardCleveland, OH 44122 2014 EatonAll Rights ReservedPrinted in USAP ublication 2015 eaton is a registered trademarkof eaton other trademarks are propertyof their respective owners