User's Manual

Page10of52
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PROTECTION
TheSPThasinternalprotectionfromabnormalorfaultconditionsasdescribedinthefollowingparagraphs:
IftheSPToutputisoperatedintoanopencircuit,aprogrammablemaximumvoltageisappliedtotheoutput.This
conditionwouldoccurintheeventofanopen wireoraconditionwhereby
theinverterisnotconnectedtothe
grid.Thesystemintegratorisresponsibleforsettingthecorrectmaximumvoltageset‐point.Itisnotpossibleto
setavoltagehigherthanthemaximumratedoutputvoltage.
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If the SPT output is operated into a short circuit, a programmable maximum current
would flow through the
outputterminals.Thismayoccurifthereisashortonagivenoutputorsomeshortmayoccuronastring.Itis
neverpossibletoprovidemorecurrentontheoutputthanthislimitallows.Thesystemintegratorisresponsible
for setting the correct maximum
 current set‐point. It is not possible to set a current higher than the specified
maximumratedoutputcurrent.
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Ifthere isacombinationofoperationalconditionswhich causetheinternaltemperaturetoexceed105°C,over‐
temperatureprotectionwillfoldbacktheoutputcurrenttoapproximately50%ofthe
fullratedvalue.Thismay
occur in an extreme combination of conditions likely including: operation at elevated ambient in the range of
70°C,operationatfullratedpower,andboostingorbuckingoveralargerange.Thisprotectionwillonlyactivate
when these extremes are maintained over long periods
of time (likely measured in hours). When the internal
temperaturecoolsto95°C,normaloperationresumes.
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