Mitsubishi Electric FR-F740 EC Instruction Manual page 627

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
current I2
Output side
power P2
Output side
power factor
Pf2
Converter
output
Tab. 8-6: Measuring points and instruments (1)
FR-F700 EC
Measuring
Measuring Point
Instrument
Across R/L1-S/L2, Moving-iron type
S/L2-T/L3, T/L3-R/L1
AC voltmeter
R/L1, S/L2, and T/L3 Moving-iron type
line currents
AC ammeter
R/L1, S/L2, T/L3 Digital power meter
and R/L1-S/L2, S/L2- (designed for
T/L3, T/L3-R/L1 inverter) or electro-
dynamic type sin-
gle-phase
wattmeter
Calculate after measuring power supply voltage, power supply side current and power supply side
power.
P1
------------------------------- - ×
=
Pf1 100%
× ×
3 V1 I1
Across U-V, V-W and Rectifier type AC
W-U
voltage meter
(Moving-iron type
cannot measure)
U, V and W line Moving-iron type
currents
AC 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)
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)
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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