Mitsubishi Electric FR-A700 Instruction Manual page 769

Maintenance and inspection
Measuring Points and Instruments
Item
Power supply
voltage U1
Power supply
side current I1
Power supply
side power P1
Power supply
side power
factor Pf1
Output side
voltage U2
Output side
current I2
Output side
power P2
Output side
power factor
Pf2
Converter
output
Tab. 8-7: Measuring Points and Instruments (1)
FR-A700 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 Electrodynamic
and R/L1-S/L2, S/L2- type single-phase
T/L3, T/L3-R/L1 wattmeter
Calculate after measuring power supply voltage, power supply side current and power supply side
power.
P1
×
-------------------------------- -
Pf1 = 100%
× ×
U
3 1 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, Electrodynamic
V-W type single-phase
wattmeter
Calculate in similar manner to power supply side power factor.
P2
×
------------------------------- -
Pf2 = 100%
× U ×
3 2 I2
Across P/+-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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