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Measurement of main circuit voltages, currents and powers
Measuring Points and Instruments
Item
Power supply voltage
V
1
Power supply side current
l
1
Power supply side power
P
1
Power supply side power factor
Pf
1
Converter output
Indicator signal
Input signal
Fault signal
5.2.1
Insulation resistance test using megger
For the converter, 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 converter so that the test voltage is not applied to the converter.
For the electric continuity test of the control circuit, use a tester (high resistance range) and do not use the megger or
buzzer.
5.2.2
Pressure test
Do not conduct a pressure test. Deterioration may occur.
146
Measuring Point
Across R and S
Across S and T
Across T and R
R, S, T line current
R, S, T and
Across R and S
Across S and T Across T and R
Calculate after measuring power supply voltage, power supply side current and power supply side power.
P
1
100%
Pf
=
1
3V
l
1
1
Across P and N
Across FM(+) and SD
RES, SOF, X1, X2, Across
ROH(+) and SD
Across A and C
Across B and C
R4/L14
Power
S4/L24
supply
T4/L34
500VDC
Converter
megger
Measuring Instrument
Moving-iron type AC voltmeter
Moving-iron type AC ammeter
Electrodynamic type single-
phase wattmeter
Moving-coil type
(such as tester)
Moving-coil type
(such as tester)
(internal resistance 50k or
more)
Moving-coil type
(such as tester)
P/+
N/-
Inverter
Earth (ground)
Remarks
(Reference Measured Value)
Commercial power supply
Within permissible AC voltage
fluctuation (Refer to page 148)
P
=W
+W
+W
1
11
12
13
(3-wattmeter method)
Converter LED display is lit.
1.35 V
1
Maximum 380V (200V class) and 760V
(400V class) during the regenerative
driving
Approximately 5VDC at maximum
frequency
(without indicator)
T1
DC8V
Pulse width T1: Adjust with Pr. 900
When open
20 to 30VDC
ON voltage: 1V or less
Electric continuity check
[Normal]
[Abnormal]
Across A and C Discontinuity
Continuity
Across B and C Continuity
Discontinuity
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