Mitsubishi Electric 700 Series Instruction Manual page 224

Measuring Points and Instruments
Item Measuring Point
Across R/L1 and S/L2
Power supply voltage
S/L2 and T/L3
V 1
T/L3 and 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 and S/L2,
power
S/L2 and T/L3,
P 1
T/L3 and R/L1
Calculate after measuring power supply voltage, power
Power supply side
supply side current and power supply side power.
power factor
Pf
Pf
1
1
Output side voltage Across U and V,
V 2 V and W and W and U
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
factor
Pf
2
Pf
2
Converter output Across P/+ and N/-
∗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
A digital power meter (designed for inverter) can also be used to measure.
Measurement of main circuit voltages, currents and powers
Measuring Instrument
Moving-iron type AC
voltmeter ∗3
Moving-iron type AC
ammeter ∗3
Digital power meter
(designed for inverter) or
electrodynamic type single-
phase wattmeter
P
1
×
= ----------------------- - 100 %
×
3V I
1 1
Rectifier type AC voltage
meter ∗1 ∗3
(moving-iron type cannot
measure)
Moving-iron type AC
ammeter ∗2 ∗3
Digital power meter
(designed for inverter) or
electrodynamic type single-
phase wattmeter
P
2
×
= ----------------------- - 100 %
×
3V I
2 2
Moving-coil type
(such as tester)
Remarks (Reference Measured Value)
Commercial power supply
Within permissible AC voltage fluctuation (Refer to
page 224)
P =W +W +W (3-wattmeter method)
1 11 12 13
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 W
2 = 21 + 22
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
7
219