MDA Report M&D Demo Kit Motordrive Analysis with Fluke MDA‐550 ‐ Page 1 of 16
MDA Report M&D Demo Kit Content General Information Quick severity overview Analysis Summary Drive Input DC‐Bus Drive Output Drive Input Motor Input Motor Shaft Drive Input DC‐Bus Drive Output Drive Input Motor Input Motor Shaft Page 2 of 16
MDA Report M&D Demo Kit Motor & Drive Demo Kit 2345 Brunn am Gebirge Liebermannstr.
MDA Report M&D Demo Kit Drive Input Drive DC‐Bus Voltage & Current Voltage Unbalance Current Unbalance Phase‐Phase Phase‐Ground V / A / Hz Vpk Apk Harmonics A (V) Harmonics B (A) V / A / Hz Vpk Apk Harmonics A (V) Harmonics B (A) Unbalance Peak Harmonics A (L1‐L2) Harmonics B (L2‐L3) Harmonics C (L3‐L1) Unbalance Peak Harmonics A (L1) Harmonics B (L
MDA Report M&D Demo Kit Drive Output Voltage & Current Voltage Modulation Voltage Unbalance Current Unbalance Phase‐Phase Phase‐Ground Phase‐DC+ Phase‐DC‐ V / A / Hz Vpk Apk Harmonics A (V) Harmonics B (A) Signal (Z1) Signal (Z1) Spectrum Bursts (Z2) Pos Bursts (
MDA Report M&D Demo Kit Motor Input Motor Shaft Voltage & Current Voltage Modulation Voltage Unbalance Current Unbalance Phase‐Phase Phase‐Ground Phase‐DC+ Phase‐DC‐ V / A / Hz Vpk Apk Harmonics A (V) Harmonics B (A) Signal (Z1) Signal (Z1) Spectrum Bursts (Z
MDA Report M&D Demo Kit Drive Input Voltage & Current Phase‐Ground Setup Phase‐Ground V, A, Hz single phase feed from bus duct Voltage within limit Current within limit *) see harmonic Frequency within limit Page 7 of 16
MDA Report M&D Demo Kit Drive Input Phase‐Ground Phase‐Ground Voltage & Current Vpk Detailed Voltage analysis Slight waveform deviation Apk Detailed current analysis Waveform deviations caused by DC‐ converter Current within limit High crest factor may cause wrong readings on other test equipment Page 8 of 16
MDA Report M&D Demo Kit Voltage & Current Harmonics A (V) Voltage Harmonics THD within limit For VFDs THD<6% is recommended THD Limit according EN 50160 is 8% Drive Input Phase‐Ground Phase‐Ground Harmonics B (A) Current Harmonics THD is quite high but due to the relatively low load no effects on other equipment on the grid is expected If load rises, problems in the grid occur or sensitive loads are connected a %TDD analysis is recommended Drive Input Voltage
MDA Report M&D Demo Kit Drive DC‐Bus ‐ Voltage DC Level DC‐Bus Voltage Slightly lower voltage than input peak voltage most likely because of small fluctuations of grid voltage and different reading resolution Voltage DC Level Recording DC‐Bus Voltage recording voltage drop during overload VFD Trip level not exceded Setup Page 10 of 16
MDA Report M&D Demo Kit Drive DC‐Bus Voltage AC Ripple DC‐Bus Ripple Voltage Low voltage level indicates no overload Due to single phase bridge rectifier frequency is 2x grid frequency Voltage AC Ripple Recording DC‐Bus Ripple recording voltage drop during overload VFD Trip level not exceded Page 11 of 16
MDA Report M&D Demo Kit Drive Output Voltage & Current Setup V, A, Hz VFD output voltage & current Output frequency during test was 70Hz Voltage and current within limits Slight deviation of current waveform leading to additional losses V/Hz Ratio unstable at different speeds ‐ further investigation necessary Page 12 of 16
MDA Report M&D Demo Kit Drive Output Voltage Modulation Phase‐Phase Setup Phase‐Phase Signal (Z1) Page 13 of 16
MDA Report M&D Demo Kit Voltage Modulation Bursts (Z2) Pos VFD Out Voltage & Burst Analysis Slightly lower voltage level than DC‐Bus voltage ‐ most likely because of small fluctuations of grid voltage and different reading resolution 470V Burst Voltage peaks – needs further investigation but within limits of motor insulation Drive Output Phase‐Phase Phase‐Phase Overshot (Z3) Peak VFD Out Voltage overshot analysis ∆U/∆t within limits of motor insulation 44% overshot of nom
MDA Report M&D Demo Kit Voltage &Current Voltage Modulation Voltage Modulation Voltage Modulation Voltage Modulation Voltage Unbalance Current Unbalance Motor Shaft Voltage Motor Input Motor Input Phase‐Phase Motor Input Phase‐Ground Motor Input Phase‐DC+ Motor Input Phase‐DC‐ Motor Input Motor Input Motor Shaft Page 15 of 16
MDA Report M&D Demo Kit Summary As this is just a demo analysis everything is how it should be.
