Mitsubishi Electric F700 Instruction Manual download pdf (Page 94)

Measurement of main circuit voltages,

currents and powers

PRECAUTIONS FOR MAINTENANCE AND INSPECTION

6.2 Measurement of main circuit voltages, currents and powers

6.2.1 Insulation resistance test using megger

For the inverter, conduct the insulation resistance test on the main circuit only as shown below and do not perform

the test on the control circuit. (Use a 500VDC megger.)

6.2.2 Pressure test

Do not conduct a pressure test. Deterioration may occur.

6.2.3 Measurement of voltages and currents

Since the voltages and currents on the inverter power supply and output sides include harmonics, measurement

data depends on the instruments used and circuits measured.

When instruments for commercial frequency are used for measurement, measure the following circuits with the

instruments given on the next page.

Examples of Measuring Points and Instruments

CAUTION

• Before performing the insulation resistance test on the external circuit, disconnect the cables from all terminals of the

inverter so that the test voltage is not applied to the inverter.

• For the continuity test of the control circuit, use a tester (high resistance range) and do not use the megger or buzzer.

Inverter

500VDC

megger

Power

supply

Moto

R/L1

S/L2

T/L3

Earth (ground) terminal

W11

W12

W13

W21

W22

Inverter

Three

phase

power

supply

To the motor

Instrument

types

Input voltage

Input current

Output voltage

Output current

: Moving-iron type

: Electrodynamometer type

: Moving-coil type

: Rectifier type

R/L1

S/L2

T/L3

P/+

N/-

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Mitsubishi Electric F700 Instruction Manual Page 94

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