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Measuring Point
Power supply
Across R-S(L
voltage
L
) and T-R(L
3
(V1)
Power supply
R, S and T(L
side current
line currents
(I1)
Power supply
At R, S and T(L
side power
L
), and across R-S(L
3
(P1)
S-T(L
Calculate after measuring power supply voltage, power supply side current and power
Power supply
supply side power.
side power factor
(Pf1)
Pf1 =
Output side
voltage
Across U-V, V-W and W-U
(V2)
Output side
current
U, V and W line currents
(I2)
Output side
At U, V and W, and across
power
U-V and V-W
(P2)
Calculate in similar manner to power supply side power factor.
Output side
power factor
Pf2 =
(Pf2)
Across P-N (+ - − )
Converter output
Start signal
Across STF, STR, RH, RM,
Select signal
RL, MRS, RES-SD
Reset
Across RES (positive)-SD
Output stop
Across MRS (positive)-SD
Across A-C
Alarm signal
Across B-C
Note: 1. Use FFT to measure the output voltage accurately. It can not be measured
accurately with a meter or general instrumentation.
2. If the carrier frequency exceeds 5kHz, do not use this instrument since using it
may increase eddy-current loss produced in metal parts inside the instrument,
leading to burnout. In this case, use an approximate effective value type.
Measuring Points and Instruments
-L
), S-T(L
-
Moving-iron type AC
1
2
2
-L
)
voltmeter
3
1
, L
and L
)
Moving-iron type AC
1
2
3
ammeter
, L
and
Electrodynamic type
1
2
-L
),
single-phase
1
2
-L
) and T-R(L
-L
)
wattmeter
2
3
3
1
P1
× 100%
×
3 V1 l1
(Cannot be measured
by moving-iron type)
Moving-iron type AC
ammeter (Note 2)
Electrodynamic type
single-phase
wattmeter
P2
× 100%
×
3 V2 l2
Moving-coil type
(such as tester)
Moving-coil type
(Meter, etc. may be
used)
(Internal resistance:
50k Ω or larger)
Moving-coil type
(such as a meter)
PROTECTIVE FUNCTIONS
Measuring
Instrument
(Reference Measured Value)*
Commercial power supply
Within permissible variation of AC
voltage (Refer to page 164)
P1 = W11 + W12 + W13
(3-wattmeter method)
(Note 1)
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
Maximum 380V during regenerative
operation
20 to 30VDC when open.
ON voltage: 1V or less
Continuity check
Across A-C: Discontinuity Continuity
Across B-C: Continuity
163
Remarks
×
V1
<Normal>
<Fault>
Discontinuity
5
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