Mitsubishi Electric FR-A862-E Instruction Manual page 83

Measurement of main circuit voltages, currents and powers
5.2.6
Measurement of inverter output frequency
In the initial setting, 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 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 the FR-A860 Instruction Manual (Detailed).
5.2.7
Insulation resistance test using megger
• For the inverter and the converter unit (FR-CC2), 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.)
NOTE
• Before performing the insulation resistance test on the external circuit, disconnect the cables from all terminals of the inverter
and the converter unit so that the test voltage is not applied to the inverter and the converter unit.
• For the continuity test of the control circuit, use a tester (high resistance range) and do not use the megger or buzzer.
Power
supply
500 VDC
megger
5.2.8
Withstand voltage test
Do not conduct a withstand voltage test. Deterioration may occur.
82
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
R/L1 P/+
Converter
S/L2
N/-
unit
T/L3
Earth (ground) terminal
P/+ U
Inverter
N/-
V
W
Earth (ground) terminal
Motor
IM
500 VDC
megger