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Measuring Points and Instruments
Item
Measuring Point
R/L1 and S/L2
Power supply voltage
S/L2 and T/L3
V
1
T/L3 and R/L1 ∗4
Power supply side
R/L1, S/L2, T/L3 line
current
current ∗4
I
1
R/L1, S/L2, T/L3 and
Power supply side
R/L1 and S/L2,
power
S/L2 and T/L3,
P
1
T/L3 and R/L1, ∗4
Calculate after measuring power supply voltage, power
supply side current and power supply side power.
Power supply side
[Three-phase power supply]
power factor
Pf
1
Pf
1
Output side voltage
Across U andV, V and W
V
and W and U
2
Output side current
U, V and W line currents
I
2
Output side power
U, V, W and
P
U and V, V and W
2
Calculate in similar manner to power supply side power factor.
Output side power
Pf
factor
2
Pf
2
Converter output
Across P/+ and N/-
Frequency setting
Across 2(+) and 5
signal
Across 4(+) and 5
Frequency setting
Across 10(+) and 5
power supply
Frequency meter
Across FM(+) and SD
signal
Start signal
Across SD and STF, STR,
Select signal
RH, RM, or RL(+)
Reset
Across RES(+) and SD
Output stop
Across MRS(+) and SD
Across A and C
Fault signal
Across B and C
∗1
Use an FFT to measure the output voltage accurately. An FA tester or general measuring instrument cannot measure accurately.
∗2
When the carrier frequency exceeds 5kHz, do not use this instrument since using it may increase eddy-current losses produced in metal parts inside the
instrument, leading to burnout. In this case, use an approximate-effective value type.
∗3
When the setting of Pr. 192 A,B,C terminal function selection is positive logic
∗4
T/L3 is only for the three-phase power input specification models.
Measurement of main circuit voltages, currents and powers
Measuring Instrument
Moving-iron type AC
voltmeter
Moving-iron type AC
ammeter
Electrodynamic type single-
phase wattmeter
P
1
×
%
=
----------------------- -
100
×
3V
I
1
1
Rectifier type AC voltage
meter ∗1
(moving-iron type cannot
measure)
Moving-iron type AC
ammeter ∗2
Electrodynamic type single-
phase wattmeter
P
2
×
=
----------------------- -
100
%
×
3V
I
2
2
Moving-coil type
(such as tester)
Moving-coil type
(tester and such may be
(internal resistance 50kΩ or
Moving-coil type
(such as tester)
Remarks (Reference Measured Value)
Commercial power supply
Within permissible AC voltage fluctuation (Refer to
page 304)
P
=W
+W
1
11
[Single-phase power supply]
Pf
=
1
Difference between the phases is within 1% of the
maximum output voltage.
Difference between the phases is 10% or lower of
the rated inverter current.
P
W
2 =
21 +
2-wattmeter method (or 3-wattmeter method)
Inverter LED display is lit. 1.35 × V1
380V maximum during regeneration for 200V class
760V maximum during regeneration for 400V class
0 to 10VDC, 4 to 20mADC
5.2VDC
Approximately 5VDC at maximum
frequency
(without frequency meter)
used)
8VDC
more)
Pulse width T1: Adjust with C0 (Pr. 900)
Pulse cycle T2: Set with Pr. 55
(frequency monitor only)
When open
20 to 30VDC
ON voltage: 1V or less
Continuity check ∗3
Across A and C
Across B and C
+W
(3-wattmeter method)
12
13
P
1
--------------- -
×
100
%
×
V
I
1
1
W
22
"5" is
common
T1
"SD" is
T2
common.
<Normal>
<Fault>
Discontinuity
Continuity
Continuity
Discontinuity
6
307
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