Measurement Of Drive Unit Output Frequency; Insulation Resistance Test Using Megger; Pressure Test - Mitsubishi Electric FR-E700EX Instruction Manual

6.2.7

Measurement of drive unit output frequency

A pulse train proportional to the output frequency is output across the frequency meter signal output terminal FM-SD of the
drive unit. 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 5VDC is indicated at the maximum frequency.
For detailed specifications of the frequency meter signal output terminal FM, refer to page 162.
6.2.8

Insulation resistance test using megger

 For the drive unit, 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.)
NOTE
 Before performing the insulation resistance test on the external circuit, disconnect the cables from all terminals of
the drive unit so that the test voltage is not applied to the drive unit.
 For the electric continuity test of the control circuit, use a tester (high resistance range) and do not use the megger or
buzzer.
6.2.9

Pressure test

Do not conduct a pressure test. Deterioration may occur.
Measurement of main circuit voltages, currents and powers
R/L1
Power
S/L2
supply
T/L3
500VDC
Drive unit
megger
Earth (Ground)
Motor
U
M
V
W
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