Ways to measure voltage, current, power on main circuit
INSPECTION AND MAINTENANCE275
6.2.4 Measurement of power
 Use digital power meters at the input and output terminals of inverter simultaneously, or use electrodynamic
meters at the input and output terminals of inverter simultaneously. Then, measure the power by the 2-power
measurement method or the 3-power measurement method. However, the input terminal current tends to be
inbalanced, so it is recommended to use 3-power measurement method for measurement.
6.2.5 Measurement of frequency
 Default setting of HDO terminal is FM function, a pulse train proportional to the output frequency is output across
terminal HDO and SD.This pulse train output can be counted by a frequency counter, or a meter (moving-coil type
voltmeter) can be used to read the average value of the pulse train output voltage.
 Please refer to Section 5.3.9.
6.2.6 Measurement of insulation resistance
 Inverter insulation resistance
1. Before measuring the inverter insulation resistance,first dismount the
wiring of all the main-circuit terminals and control board. Thendo the wiring
as shown in the right picture ture.
2. The measurement is only suitable for the main circuit. It is prohibited to
use a high-resistance meter for measuring terminals on the control board.
3. The value of the insulation resistance shall be greater than 5MΩ.
Note: Please use a 500 VDC megger.
 Motor insulation resistance
1. Before the measurement, please dismount the motor, and execute the wiring as
shown in the diagram on the right.
2. The value of the insulation resistance shall be greater than 5MΩ.
Note: Please use a suitable megger.
6.2.7 Hi-pot test
 Do not conduct a hi-pot test. Deterioration may occur on the internal semiconductor components of the inverter.
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