Isolation Fault Troubleshooting - Application Note
Isolation Fault Troubleshooting - Application NoteVersion HistoryVersion - August 2022 - 1000V testing supported on S-Series optimizersVersion - October 2021 - Updated tester -to-module connection schemeVersion - October 2021 - 'Checking the DC Voltage' procedure updated, error codes updatedContentsIntroduction1Identifying an Isolation Fault1Troubleshooting an Isolation Fault (Using the Inverter LCD Display or SetApp)2Using an Insulation Tester7IntroductionIn photovoltaic systems with a transformer-less inverter, the DC is isolated from ground.
Using an Insulation Tester In this procedure, you check the resistance of system components, drilling-down from string level, through power-optimizer/module pairs, and finally a single component – a power optimizer or a module. You also check the wiring between components. For this procedure, use an insulation tester and a connector branch cable.
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