Technical FAQs 4

How to evaluate motors and inverters accurately and efficiently?

Motors and inverters can be evaluated accurately and efficiently. nPower calculation function of Oscilloscope and ScopeCorder You can use the power calculation function of the Oscilloscope or ScopeCorder, if you only need rough power measurements, rather than the high-precision power measurements using a power analyzer.

How do you calculate phase-to-neutral voltage?

The voltages are all measured relative to the neutral. Phaseto-phase voltages can be accurately calculated from the phase-to-neutral voltage amplitudes and phases using vector mathematics. The total power, ΣTrPwr = P1 + P2 + P3. Figure 19. Three-phase, four-wire (three wattmeter method).

What measurements can be used on the output of a VFD?

The same power quality and harmonics measurements that are used on the input to the VFD can also be used on the output of the drive to check voltage, current, phase, and power. These are detailed in the "Input Measurements" section of this primer.

How do you measure voltage in a 3-phase system?

Voltages in the system can be determined by measuring two phases with respect to the third. Figure 15. This 3-wire star system (no neutral) is used to illustrate how the two-wattmeter method can be used to measure a 3-phase system. The instantaneous power measured by each wattmeter is the product of the instantaneous voltage and current samples.

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