268
Measurement of main circuit voltages, currents and powers
Measuring Points and Instruments
Item
Measuring Point
Measuring Instrument
Remarks (Reference Measured Value)
Power supply voltage
V1
R/L1-S/L2
S/L2-T/L3
T/L3-R/L1
Moving-iron type AC
voltmeter
Commercial power supply
Within permissible AC voltage fluctuation
Power supply side
current
I1
R/L1, S/L2, T/L3 line
current
Moving-iron type AC
ammeter
Power supply side
power
P1
R/L1, S/L2, T/L3 and
R/L1-S/L2,
S/L2-T/L3,
T/L3-R/L1,
Electrodynamic type single-
phase wattmeter
P1=W11+W12+W13 (3-wattmeter method)
Power supply side
power factor
Pf1
Calculate after measuring power supply voltage, power
supply side current and power supply side power.
[Three-phase power supply]
[Single-phase power supply]
Output side voltage
V2
Across U-V, V-W and W-U
Rectifier type AC voltage
meter
∗1
(moving-iron type cannot
measure)
Difference between the phases is within 1% of the
maximum output voltage.
Output side current
I2
U, V and W line currents
Moving-iron type AC
ammeter
Difference between the phases is 10% or lower of
the rated inverter current.
Output side power
P2
U, V, W and
U-V, V-W
Electrodynamic type single-
phase wattmeter
P2 = W21 + W22
2-wattmeter method (or 3-wattmeter method)
Output side power
factor
Pf2
Calculate in similar manner to power supply side power factor.
Converter output
and -
Moving-coil type
(such as tester)
Inverter LED display is lit. 1.35 × V1
Frequency setting
signal
Across 2(positive)-5
Moving-coil type
(tester and such may be
used)
(internal resistance 50k
Ω
or
more)
0 to 10VDC4 to 20mADC
"5" is
common.
Across 4(positive)-5
Frequency setting
power supply
Across 10(positive)-5
5.2VDC
Frequency meter
signal
Across AM(positive)-5
Approx. 10VDC at maximum
frequency (without frequency meter)
Start signal
Select signal
STF, STR
Across RH, RM, RL -
PC (positive)
When open
20 to 30VDC
ON voltage: 1V or less
"PC" is
common.
Fault signal
Across A-C
Across B-C
Moving-coil type
(such as tester)
Continuity check
∗3
<
Normal
>
<
Fault
>
Across A-C Discontinuity
Continuity
Across B-C
Continuity
Discontinuity
∗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
Pf
1
P
1
3V
1
I
×
1
------------------------ 100
×
=
%
Pf
1
P
1
V
1
I
×
1
---------------- 100
×
=
%
Pf
2
P
2
3V
2
I
2
×
------------------------ 100
×
=
%
Содержание FR-D700 Series
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