Mitsubishi Electric FR-D700 Instruction Manual page 272

Measurement of main circuit voltages, currents and powers
Measuring Points and Instruments
Item
R/L1-S/L2
Power supply voltage
S/L2-T/L3
V 1
T/L3-R/L1
Power supply side
R/L1, S/L2, T/L3 line
current
current
I
1
R/L1, S/L2, T/L3 and
Power supply side
R/L1-S/L2,
power
S/L2-T/L3,
P
1
T/L3-R/L1,
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
Output side voltage
Across U-V, V-W and W-U
V
2
Output side current
U, V and W line currents
I
2
Output side power U, V, W and
P 2 U-V, V-W
Calculate in similar manner to power supply side power factor.
Output side power
factor
Pf
Pf
2
Converter output Across + and -
Frequency setting Across 2(positive)-5
signal Across 4(positive)-5
Frequency setting
Across 10(positive)-5
power supply
Frequency meter
Across AM(positive)-5
signal
STF, STR
Start signal
Across RH, RM, RL -
Select signal
PC (positive)
Across A-C
Fault signal
Across B-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
268
Measuring Point Measuring Instrument
Moving-iron type AC
voltmeter
Moving-iron type AC
ammeter
Electrodynamic type single-
phase wattmeter
P
1
----------------------- - × %
= 100
1
×
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
2
×
3V I
2 2
(tester and such may be
(internal resistance 50kΩ or
Commercial power supply
Within permissible AC voltage fluctuation (Refer to
page 274)
P 1 =W
[Single-phase power supply]
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
2 =
2-wattmeter method (or 3-wattmeter method)
Moving-coil type
Inverter LED display is lit. 1.35 × V1
(such as tester)
0 to 10VDC4 to 20mADC
Moving-coil type
5.2VDC
used) Approx. 10VDC at maximum
frequency (without frequency meter)
more) When open
20 to 30VDC
ON voltage: 1V or less
Continuity check ∗3
Moving-coil type
(such as tester) Across A-C Discontinuity
Across B-C
Remarks (Reference Measured Value)
11 +W 12 +W 13 (3-wattmeter method)
P
1
--------------- - ×
Pf = 100
%
1
×
V I
1 1
W W
21 + 22
<Normal> <Fault>
Continuity
Continuity Discontinuity
"5" is
common.
"PC" is
common.