User Manual - Rev AV AMETEK Programmable PowerMX Series 182check the connections and phase measurements if this is not the case to make sure themeasurement readings you get are indeed correct.If it is necessary to adjust the pots, see Table 6-6 for the corresponding pot designators. Thetop cover has to be removed to access these pots. They are located along the top edge ofthe controller board(s). For Series I MX units, adjustments for phase A are on the phase Aboard (7000-721), adjustments for phase B and C are on the phase B/C board (7000-722).For Series II MX units, all adjustments are on the 7003-718 controller board. The referencedesignators are the same on either series controller.12. Repeat steps 2 through 11 for phase B and C. (except on single phase only models).MX Series I R resistive Xl inductivePhase / Board #Phase A (7000-721) R121 R122Phase B (7000-722) R112 R111Phase C (7000-722) R114 R115MX Series II R resistive Xl inductivePhase / Board #Phase A (7003-718-2 / -4) R121 R122Phase B (7003-718-2) R112 R111Phase C (7003-718-2) R114 R115Table 6-6: Programmable Z adjustment potsDefinitions:VNL = Measured RMS voltage under no load.VL = Measured RMS voltage under loadI = Measured RMS current.F = Source frequency (50 Hz).∆Φ= Phase angle shift between load and no load conditions. Record phase anglefrom phase meter under NL and L condition and determine phase shift.Formulas to calculate R and L component of output impedance:R = ( VNL * cos(∆Φ) - VL ) / IXL = ( VNL * sin(∆Φ)) / IL = XL / (2 * Pi * F)Table 6-7: Formulas to calculate R and L
