Measurement Of Inverter Output Frequency; Insulation Resistance Test Using Megger; Pressure Test - Mitsubishi FR-A800 Instruction Manual

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Measurement of inverter output frequency

In the initial setting of the FM-type inverter, a pulse train proportional to the output frequency is output across the pulse train

output terminals FM and SD of the inverter. This pulse train output can be counted by a frequency counter, or a meter

(moving-coil type voltmeter) can be used to read the mean value of the pulse train output voltage. When a meter is used to

measure the output frequency, approximately 5 VDC is indicated at the maximum frequency.

For detailed specifications of the pulse train output terminal FM, refer to

In the initial setting of the CA-type inverter, a pulse train proportional to the output frequency is output across the analog

current output terminals CA and 5 of the inverter. Measure the current using an ammeter or tester.

For detailed specifications of the analog current output terminal CA, refer to

• 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 500 VDC megger.)

• 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.

Do not conduct a pressure test. Deterioration may occur.

Measurement of main circuit voltages, currents and powers

PRECAUTIONS FOR MAINTENANCE AND INSPECTION

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