Mitsubishi FR - S500 Instruction Manual page 167

Item
Power supply
Across R-S, S-T
voltage
and T-R
(V1)
Power supply side
R, S and T line
current
currents
(I1)
Power supply side At R, S and T, and
power across R-S, S-T
(P1) and T-R
Calculate after measuring power supply voltage, power supply side current
and power supply side power.
Power supply side
power factor [For three-phase power supply]
(Pf1)
Pf1=
Output side voltage Across U-V, V-W
(V2) and W-U
Output side current U, V and W line
(I2) currents
At U, V and W, and
Output side power
across U-V and V-
(P2)
W
Calculate in similar manner to power supply side power factor.
Output side power
factor
Pf2=
(Pf2)
Converter output Across P-N
Across 2 (+)-5
Frequency setting
signal
Across 4 (+)-5
Measuring Points and Instruments
Measuring Point
Moving-iron type
AC voltmeter
Moving-iron type
AC ammeter
Electrodynamic
type single-phase
wattmeter
P1
100%
3V1 I1
Rectifier type AC
voltmeter (Note 1)
(Cannot be
measured by
moving-iron type)
Moving-iron type
AC ammeter
(Note 2)
Electrodynamic
type single-phase
wattmeter
P2
100%
3V2 I2
Moving-coil type
(such as a meter)
Moving-coil type
(Meter, etc. may be
used)
(Internal resistance:
50k
Measuring
Instrument (Reference Measured Value)
Is the commercial power supply
within permissible variation of AC
voltage
(Refer to page 161)
P1 = W11 + W12 + W13
(3-wattmeter method)
[For single-phase power supply]
Pf1=
Difference between phases is
within 1% of maximum output
voltage.
Current should be equal to or
less than rated inverter current.
Difference between phases is
10% or lower.
P2 = W21 + W22
2-wattmeter method (or 3-
wattmeter method)
Inverter LED display is lit.
1.35 × V1
0 to 5V/0 to 10VDC
4 to 20mADC
or larger)
158
Remarks
P1
100%
V1 I1
3