Mitsubishi Electric FR-E540 Instruction Manual download pdf (Page 196)

PROTECTIVE FUNCTIONS

182

5.3.9 Measurement of main circuit voltages, currents and power

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.

〈

〉

〈

〉

〈

〉

Inverter

〈

〉〈

–

〉

3-phase

power

supply

Instrument

Input voltage

Input current

Output voltage

Output current

To motor

:Moving-iron type

:Moving-coil type

:Electrodynamometer type

:Rectifier type

Typical Measuring Points and Instruments

Note: Use an FFT to measure the output voltage accurately. Accurate measurement cannot be made if you

use a tester or general measuring instrument.

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Mitsubishi Electric FR-E540 Instruction Manual Page 196