9
WARNING
Hazardous
voltage
Mounting the Controller
Section 5 (continued)
Note
Donotblocktheheatsink(ns)andfansanddonotsetanythingontheunits.
Warning
Thecontrolleraccesscovershouldalwaysbesecurelyfastenedtothecontrolboxdue
tothedangerousvoltage/shockhazardinsidetheunit.Alockcanbeusedtoprevent
unwantedentry.
Power Supply and Wiring

Section 6

Power Supply

Note
InstallationandmaintenanceMUSTbeperformedbyproperlytrainedandqualiedpersonnel.
AlwaysfollowtheNationalElectricalCode(NEC)orCanadianElectricCode(CEC),aswellasall
state,localandprovincialcodeswhenwiringthesystem.
Thetypeoftransformerandtheconnectioncongurationfeedingadriveplaysanimportantroleinitsperformance
andsafety.Thefollowingisabriefdescriptionofsomeofthemorecommoncongurationsandadiscussionoftheir
virtuesandshortcomings.Alwaysaskwhattypeofpowersystemthesitehasbeforesizingthedrive.

Delta/Wye with grounded Wye neutral

Thiscongurationisoneofifnotthemostcommon.Itprovidesrebalancingofunbalancedvoltagewitha30
degreephaseshift.Dependingontheoutputconnectionsfromthedrivetomotor,thegroundedneutralmay
beapathforcommonmodecurrentcausedbythedriveoutput.