Mitsubishi Electric FR-A700 EC, Instruction Manual

Page: 769 / 826

Maintenance and inspection Measurements on the main circuit
FR-A700 EC 8 - 17
Measuring Points and Instruments
Item Measuring Point
Measuring
Instrument
Remarks (Reference Measurement Value)
Power supply
voltage U1 Across R/L1-S/L2,
S/L2-T/L3, T/L3-R/L1 Moving-iron type
AC voltmeter Commercial power supply
Within permissible AC voltage fluctuation
(Refer to appendix A)
Power supply
side current I1 R/L1, S/L2, and T/L3
line currents Moving-iron type
AC ammeter
Power supply
side power P1 R/L1, S/L2, T/L3
and R/L1-S/L2, S/L2-
T/L3, T/L3-R/L1 Electrodynamic
type single-phase
wattmeter P1 = W11 + W12 + W13 (3-wattmeter method)
Power supply
side power
factor Pf1 Calculate after measuring power supply voltage, power supply side current and power supply side
power.
Output side
voltage U2 Across U-V, V-W and
W-U Rectifier type AC
voltage meter
(Moving-iron type
cannot measure)
Difference between the phases is within ±1% of the
maximum output voltage
Output side
current I2 U, V and W line
currents Moving-iron type
AC ammeter
Difference between the phases is 10% or lower of
the rated inverter current.
Output side
power P2 U, V, W and U-V,
V-W Electrodynamic
type single-phase
wattmeter P2 = W21 + W22
2-wattmeter method (or 3-wattmeter method)
Output side
power factor
Pf2 Calculate in similar manner to power supply side power factor.
Converter
output Across P/+-N/
−
Moving-coil type
(such as tester) Inverter LED display is lit.
1.35
×
V1
Tab. 8-7: Measuring Points and Instruments (1)
Pf1
P1
3
U
1 I1
× ×
---------------------------------
100%
×
=
Pf2
P2
3
U
2 I2
× ×
-------------------------------- 100%
×
=