Table of Contents
Advertisement
Item
Measuring Point
Power supply
Across R-S (L
voltage
L
and T-R (L
3)
(V1)
Power supply side
R, S and T line currents
current
(L
, L
1
2
(I1)
Power supply side
At R (L
power
and across R-S (L
(P1)
(L
-L
) and T-R (L
2
3
Calculate after measuring power supply voltage, power supply side current and power supply side
power.
Power supply side
[For three-phase power supply]
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 power
At U, V and W, and across U-
(P2)
V and V-W
Calculate in similar manner to power supply side power factor.
Output side power
factor (Pf2)
Pf2=
Converter output
Across P-N (+ - –)
Across 2 (positive)-5
Frequency setting
signal
Across 4 (positive)-5
Frequency setting
Across 10 (positive)-5
power supply
Frequency meter
Across AM (+)-5
signal
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 instrument.
Measuring Points and Instruments
Measuring Instrument
-L
), S-T (L
-
Moving-iron type AC
1
2
2
-L
)
voltmeter
3
1
Moving-iron type AC
and L
line currents)
ammeter
3
), S (L
) and T (L
),
1
2
3
Electrodynamic type
-L
), S-T
1
2
single-phase wattmeter
-L
)
3
1
P1
100%
3V I1
(Cannot be measured by
Moving-iron type AC
ammeter
Electrodynamic type
single-phase wattmeter
P2
100%
3V2 I2
Moving-coil type
(such as tester)
Moving-coil type
(Meter, etc. may be used)
(Internal resistance:
Ω
50
Moving-coil type
(Meter, etc. may be used)
(Internal resistance:
50k Ω or larger)
Moving-coil type
(such as a meter)
MAINTENANCE/INSPECTION
(Reference Measured Value)
Is the commercial power supply within
permissible variation of AC voltage
(Refer to page 192)
P1 = W11 + W12 + W13
(3-wattmeter method)
[For single-phase power supply]
P1
Pf1=
100%
V1 I1
(Note 1)
Difference between phases is within
±1% of maximum output voltage.
moving-iron type)
Current should be equal to or less than
rated inverter current.Difference
(Note 2)
between phases is 10% or lower.
P2 = W21 + W22
2-wattmeter method (or 3-wattmeter
method)
Inverter LED display is lit. 1.35 × V1
Maximum 923V during regenerative
operation
0 to 5V/0 to 10VDC
4 to 20mADC
5VDC
or larger)
Approximately 10DVC at
maximum frequency (without
frequency meter)
20 to 30VDC when open.ON
voltage: 1V or less
Continuity check
Across A-C: Discontinuity Continuity
Across B-C: Continuity
189
Remarks
<Normal>
<Fault>
Discontinuity
6
Advertisement
Table of Contents
