Mitsubishi Electric FR-E700 Instruction Manual page 575

Maintenance and inspection
Measuring Points and Instruments
Item
Power supply
voltage V1
Power supply
side current I1
Power supply
side power P1
Power supply
side power
factor Pf1
Output side
voltage V2
Output side cur-
rent I2
Output side
power P2
Output side
power factor
Pf2
Converter
output
Tab. 8-5:
Use an FFT to measure the output voltage accurately. An FA tester or general measuring instru-
ment cannot measure accurately.
When the carrier frequency exceeds 5 kHz, 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.
T/L3 is only for the three-phase power input specification models.
A digital power meter (designed for inverter) can also be used to measure.
FR-E700 SC EC/ENE
Measuring
Measuring Point
Instrument
Across Moving-iron type AC
R/L1-S/L2,
voltmeter
S/L2-T/L3,
T/L3-R/L1
R/L1, S/L2, and T/L3 Moving-iron type AC
line currents ammeter
R/L1, S/L2, T/L3 Digital power meter
and R/L1-S/L2, (designed for
S/L2-T/L3, inverter) or electro-
dynamic type sin-
T/L3-R/L1
gle-phase
wattmeter
Calculate after measuring power supply voltage, power supply side current and power supply side
power.
Single-phase power supply
P1
Pf1 = ------------------ 100 %
V1 I1
Across U-V, V-W Rectifier type AC
and W-U
voltage meter
(Moving-iron type
cannot measure)
U, V and W line Moving-iron type AC
currents
ammeter
U, V, W and U-V, Digital power meter
V-W (designed for
inverter) or electro-
dynamic type sin-
gle-phase
wattmeter
Calculate in similar manner to power supply side power factor.
P2
Pf2 = -------------------------------- - 100%
3 V2 I2
Across P/+ and N/ Moving-coil type
(such as tester)
Measuring points and instruments of the main circuit
Measurements on the main circuit
Remarks (Reference Measurement Value)
Commercial power supply
Within permissible AC voltage fluctuation
(Refer to appendix A)
—
P1 = W11 + W12 + W13 (3-wattmeter method)
Three-phase power supply
P1
Pf1 = -------------------------------- - 100 %
3 V1 I1
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.
P2 = W21 + W22
2-wattmeter method (or 3-wattmeter method)
Inverter LED display is lit. 1.35 V1
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