Mitsubishi FR - S500 instruction manual Measurement of main circuit voltages, currents and powers

3.3.8 Measurement of main circuit voltages, currents and powers

Measurement of voltages and currents

Since the voltages and currents on the inverter power supply and output sides include harmonics, accurate measurement depends on the instruments used and circuits measured.

When instruments for commercial frequency are used for measurement, measure the following circuits using the instruments given on the next page.

Three-phase 200V power input Three-phase 400V power input

Input	Output
voltage	voltage
Input	Output
current	current

Single-phase 200V

power input

Single-phase 100V

power input

Inverter

	Ar	W11
3-phase		Vr
	As	W12
power supply
		Vs
	At	W13
		Vt

The FR-S520S-0.1K to 1.5K and FR-S510W-0.1K to 0.75K do not have As, At, Vt, Vs, W12 and W13.

Instrument types

R	U	Au	W21
			Vu
S	V	Av
			Vv
T	W	Aw	W22
			Vw
P	N
	V
+	-

To motor

:Moving-iron type

:Electrodynamometer type

:Moving-coil type

:Rectifier type

Typical Measuring Points and Instruments

CAUTION

Use FFT (Fast Fourier Transforms) to measure the output voltage accurately. It cannot be measured accurately with a meter or general instrument.

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