Eaton Power Xpert Solar 1500 User Manua

TroubleshootingPower Xpert Solar 1500/1670 kW Inverter MN141001EN—October 2014 www.eaton.com 43TroubleshootingReasons for troubleshooting the inverter include annunciatedfaults, reduced-exported power, and physical damage to theinverter from external events. Understanding the basis of anytroubles characterized as either array-based, inverter-basedor grid-based forms the analysis process of troubleshootingthe inverter.Array-InputThe inverter’s input-power window is the specified minimumand maximum DC voltage while supplying enough current toovercome approximately 0.5% of the inverter’s AC powerrating. The minimum DC voltage is defined as the lowerMPPT voltage. The inverter will not synchronize to the utilityand export power when the PV array is below its minimumvoltage. The maximum DC voltage is defined as 1000 V,typically corresponding to the photovoltaic array’s Vac duringnon-operation. The PV array (input power) must alwaysremain slightly greater than the export power (barringmomentary LVRT events if the inverter is so equipped oroperated). While detected and annunciated as a FAULT orWARNING, loss of the appropriate photovoltaic input-powermay not be considered an inverter-centric troubleshootingevent. For example, when operating near the inverter’s lowervoltage window, large arrays can lose enough power due tosudden shading that the inverter will shut-off as its naturalpower processing will collapse the array’s voltage. Whilesuch events are outside the scope of this manual and normalinverter operation, understanding the available faults andwarnings will give rise to determining if an external eventadversely affected the inverter’s INPUT.AC-OutputThe inverter’s sinusoidal output waveform must match theutility’s across the step-up transformer’s 3-phases,accounting for voltage magnitude, frequency, phase-angle,and power-factor. The UL1741 grid-tie IEEE 1547 settingsare the default-basis for the grid specification and continuedinverter operation. While detected and annunciated as aFAULT or WARNING, loss of the appropriate grid may not beconsidered an inverter-centric troubleshooting event. Whilesuch events are outside the scope of this manual and normalinverter operation, understanding the available faults andwarnings will give rise to determining if an external eventadversely affected the AC-OUTPUT.InverterMultiple fault-tolerant control algorithms will always try toreset the inverter whenever the PV-array or AC-Grid falloutside of the operating specifications, automaticallyresuming operation once both the input (array) and output(grid) are within specification. While complexengineering-level diagnostic steps are outside the scope ofthis manual, understanding the available faults and warningswill give rise to determining if an internal event adverselyaffected the INVERTER.Identifying Inverter Faults and WarningsDetected events or situations that prevent power export areannunciated via the HMI and Modbus as either faults orwarnings. In addition, a history log is stored on-board theinverter.● The inverter will indicate specific faults and warnings viathe HMI display.● Active and historical data is stored under the fault! menuand can be accessed via the HMI display.Inverter Response to Faults and WarningsFAULT and WARNING are divided in 4 categories whichprovide the basis of the inverter’s behavior whenever theseare detected or present. The FAULT category takesprecedence over the WARNING category. Detection takesplace in any state, however;● For instance … if already in the fault state and a criticalfault occurs, the inverter transitions appropriately.● When in the critical fault state, the inverter will still detectmost warnings and faults, yet they will not be acted upon.Fault location:● Power-Stack 1 indicates the fault occurred in the 1stinverter (left-side stack).● Power-Stack 2 indicates the fault occurred in the 2ndinverter (middle stack).● Power-Stack 3 indicates the fault occurred in the 3rdinverter (right-side stack).Inverter system (Inv sys):● Indicates the fault occurred outside of the inverter, andwithin the separate diagnostic circuits from the modules orstacks.Fault text on HMI:● Displays the fault code followed by the fault textDESCRIPTION is a basic statement about the faultRESOLUTION is the basic recommendation for gatheringinformation, addressing the issue and resuming inverteroperation.