9424200994 Rev N 395Auxiliary Undervoltage (27X) TestFunctional testing is a way to assess this protection system’s suitability for your application. Functionaltesting goes beyond the more basic tests found in acceptance testing, but lacks the detailed functiontesting that is part of the commissioning process.Test each of the following functions to verify that this BE1-11g measures accurately, is within specifiedtolerances, and operates correctly. These tests are also suitable for assisting in systematictroubleshooting in the event that an operation is questioned. Revisiting the test of a specific function canhelp verify whether the BE1-11g is operating within specified tolerances. For further assistance, contactBasler Electric, Technical Sales Support.Refer to the Terminals and Connectors chapter for terminal locations and connections.Reset all targets prior to each test by navigating to the Metering > Status > Targets screen and pressingthe front-panel Reset key. Enter the appropriate username and password if prompted. Clear all logic priorto each test by using the Settings Explorer in BESTCOMSPlus® to open the BESTlogic™PlusProgrammable Logic screen and click the Clear button located on the toolbar. After new BESTlogicPlussettings are made, click the Save button located on the toolbar to compile BESTlogicPlus. UploadBESTlogicPlus settings by selecting Upload Logic to Device from the Communication pull-down menu.Operational settings can be sent by selecting Upload Settings to Device from the Communication pull-down menu or by clicking the Send Settings button on the toolbar.The actual operating time of an output contact is equal to the recognition time plus the time delay setting(accuracy) plus 6 milliseconds. Output contact operating time depends upon the type of test set used andits operating characteristics.A Functional Test Report is included at the end of this chapter. It should be used to record the results andverify pickup and timing accuracy.Refer to the Auxiliary Undervoltage (27X) Protection chapter for more information on this function.Functional Test ProcedurePickup Verification (3V0 Mode)3V0 mode is used to monitor a three-phase system for unbalanced voltages. The 3V0 measurementincreases as the three-phase voltages become unbalanced. For simplicity, this test will force a systemimbalance by increasing only the A-phase voltage. For example, for a 3V0 pickup setting of 115 V, a 3V0trip would occur after VA was raised from 0 to 115 V while VB and VC remained at 0 V.Step 1: Use BESTCOMSPlus to send the operational settings in Table 139 to the BE1-11g. Reset alltargets.Table 139. Operational Settings (3V0 Mode)Setting Value BESTCOMSPlus Screen DescriptionPhase VT Ratio 1 System Parameters, SensingTransformersSets phase VT ratio to 1Phase VTConnection4W-Y System Parameters, SensingTransformersSets phase VT connection to4W-Y27/59 Mode PN System Parameters, SensingTransformersSets 27/59 mode to phase-neutralElement Mode 3V0 Protection, Voltage, Undervoltage(27X-1)Enables 27X-1 function for3V0 modeInhibit Level 10 V Protection, Voltage, Undervoltage(27X-1)Sets inhibit level to 10 VBE1-11g Auxiliary Undervoltage (27X) Test
