Eaton Power Xpert Solar 1500 User Manua

Power Xpert Solar 1500/1670 kW Inverter10 Power Xpert Solar 1500/1670 kW Inverter MN141001EN—October 2014 www.eaton.comTable 3. DC Input Fuse Re-Combiner Options: Power Xpert Solar 1500/1670 kW InverterNote1 Consult Eaton.Grounded Input CircuitsThe grounded PV conductors are connected to a non-fusedbus, working in concert with the UL ® 1741 compliant5-ampere photovoltaic ground-fault detection andinterruption feature. The grounded-conductor connectionsrequire the same 2-hole 1/2-inch diameter (bolt) compressionlugs as the non-grounded conductors, as the examples listedin Table 3. Up to 600 kcmil single-conductor lugs areacceptable as listed in Table 3. Consult Eaton for conductorslarger than 600 kcmil or dual-conductor (per terminal) usage.DC Equipment Ground Circuits and GroundingElectrode TerminalA corresponding 1/4-inch thick equipment-ground busbarto the PV non-grounded and grounded input circuits has24 single-holes for 5/16-inch single-hole compression lugs.Additionally, the ground busbar has two 2-hole 1/2-inch dia.at 1.75-inch spacing, two 1/2-inch, four 3/8-inch spaced at1.25-inch, and an additional two 1/2-inch diameter holesfor single-hole compression lugs. Use this DC ground busas the PV’s GET. Refer to Figure 24 for details.Negative or Positive Grounded Photovoltaic SystemsEither a negative or positive grounded configuration canbe ordered. Either must be ordered and factory-built andcannot be field modified. Figure 5 displays the typicalnegative-grounded photovoltaic system in which the PVpositive is non-grounded.DC Surge SuppressionSurge suppression devices are featured on both thegrounded (negative) and non-grounded (positive) input bus.The suppression’s primary operation is protecting theinverter from voltage-spikes from the PV system (modules,racking, conduit, etc.) principally due to lightning strikes.Eaton recommends primary lightning-suppression at thesolar field level, in the source-combiners, for all locationssubject to thunder storms and lightning.Inverter DC Disconnect Switches and Pre-ChargePost the sub-combiner; 3 load-break switches isolate theinverter stacks from the photovoltaic input circuits. Thesedisconnect both the positive and negative PV bus.Prior to the initial manual-closing of the DC switches DS1,DS2, DS3, the inverter uses a DC-input pre-charge process.The pre-charge circuit controls the in-rush current from thePV array ensuring the inverter’s capacitive-bank is notstressed (soft-start effect). From the HMI, thecharge-request is initiated, where the pre-charge circuit isused to charge to inverter’s DC bus capacitors. Once theinput voltage exceeds the configurable wake-up set-point(voltage), the bus disconnects (DS1, DS2, and DS3) are to bemanually closed. With the disconnects closed, the powerstacks are fully connected to the PV array, ready to invert andexport the photovoltaic DC energy. The pre-charge featureonly needs to be performed when the disconnects are open.DS1, DS2, DS3 and pre-charge are illustrated in Figure 5.Once the inverter is commissioned and operational on adaily-basis, the pre-charge circuit is not used and the daily PVarray energy completes the input capacitor charging in anatural soft-start effect with increasing solar irradiance.In the event of a power stack fault, these DC disconnectswitches can be individually opened (tripped), enablingcontinuous operation up to 2/3 rated power. In such anevent, the disconnected power stack will also be isolatedfrom the AC via its corresponding output contactor (K8, K9,or K10).Number of InputsRecommendations(24 maximum)Fuse AmpacityTypical Usage(DC Amperes)Compression Lug2-Hole: 1/2 inch dia. at 1.75 inch spacingLugs not supplied with the inverterCompression Lugs—Tin-Plated-Bar: 1/4 inch24 x 1000 Vdc Fuse 160, 200, 250 As specific to solar site or design:350 kcmil example lugsBurndy p/n YA31A3Ilsco p/n 21ACL-350600 kcmil example lugsBurndy p/n YA36A3Ilsco p/n 21ACL-600Al/Cu22 x 1000 Vdc Fuse 200, 250, 31520 x 1000 Vdc Fuse 250, 315, 35018 x 1000 Vdc Fuse 315, 350, 35516 x 1000 Vdc Fuse 315, 350, 35514 x 1000 Vdc Fuse 315, 350, 355Other, larger fuses 400–630 Amp 1 1