Lumel ND30IoT User Manual

ND30IoT-09A 17 User's manualCurrent value in the neutral wire IN is calculated from phase current vectors.7.1.1 Measurement of voltage and current harmonicsThe choice of harmonics is done by selecting the pages dedicated to display the values ofvoltage harmonics U1, U2, U3 and currents I1, I2, I3 simultaneously for 3-phase (page 11). Thenumber of a displayed harmonics can be changed in the range of 2..51 by the buttons orPage 12 shows a bar chart of the harmonics for each phase: voltage at the top and currents atthe bottom of the screen. Page 12 shows a bar chart of the harmonics. The choice of displayedharmonics is done by pressing a button . The button is used to select the groupsof harmonics: harm2 - harm 26 , harm 27 - harm 52 or harm 2 - harm51 .Fig. 13. Screens 11 and 12 - visualization of harmonics7.1.2 Analog indicatorPage 13 shows the mapping of the selected quantity on the analog indicator. Theselection of displayed quantity is made in the Display mode as described in item 7.5,by selecting page 13. Preview or hiding of the maximum or minimum values takes place afterpressing the or button respectively. Deleting the maximum or minimum values isdone by pressing the and then or button. If the lower or upper scalethreshold is exceeded, the message BOTTOM SCALE or UPPER SCALE appears.L1,2,3 +Max MinDel Max Min