Mitsubishi Electric FR-D710W-0.1K, Instruction Manual

Page: 285 / 313

283
Measurement of main circuit voltages, currents and powers
6
P
R
E
CAUTIONS FOR MAINTE
NAN
CE AN
D
INS
P
E
C
T
IO
N
Measuring Points and Instruments
Item Measuring Point Measuring Instrument Remarks (Reference Measured Value)
Power supply voltage
V1
R/L1 and S/L2
S/L2 and T/L3
T/L3 and R/L1
∗4
Moving-iron type AC
voltmeter
∗5
Commercial power supply
Within permissible AC voltage fluctuation
(Refer to
page 288)
Power supply side
current
I1
R/L1, S/L2, T/L3 line
current
∗4
Moving-iron type AC
ammeter
∗5
Power supply side
power
P1
R/L1, S/L2, T/L3 and
R/L1 and S/L2,
S/L2 and T/L3,
T/L3 and R/L1
∗4
Digital power meter
(designed for inverter) or
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.
[Three-phase power supply]
[Single-phase power supply]
Output side voltage
V2 Across U and V, V and W,
and W and U
Rectifier type AC voltage
meter
∗1 ∗5
(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
∗2 ∗5
Difference between the phases is 10% or lower of
the rated inverter current.
Output side power
P2 U, V, W and
U and V, V and W
Digital power meter
(designed for inverter) or
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/+ and N/-
Moving-coil type
(such as tester)
Inverter LED display is lit. 1.35 × V1
Frequency setting
signal Across 2(+) and 5
Moving-coil type
(tester and such may be
used)
(internal resistance 50k
Ω
or
more)
0 to 10VDC, 4 to 20mADC
"5" is
common Across 4(+) and 5
Frequency setting
power supply
Across 10(+) and 5 5.2VDC
Frequency meter
signal
Across FM(+) and SD
Approximately 5VDC at maximum
frequency
(without frequency meter)
Pulse width T1 : Adjust with C0 (Pr.
900)
Pulse cycle T2 : Set with Pr. 55
(frequency monitor only)
"SD" is
common.
Start signal
Select signal Across SD and STF, STR,
RH, RM, or RL(+)
When open
20 to 30VDC
ON voltage: 1V or less
Fault signal
Across A and C
Across B and C Moving-coil type
(such as tester)
Continuity check
∗3
<
Normal
> <
Fault
>
Across A and C Discontinuity Continuity
Across B and C Continuity Discontinuity
∗1
Use an FFT to measure the output voltage accurately. An FA tester or general measuring instrument cannot measure accurately.
∗2
When the carrier frequency exceeds 5kHz, do not use this instrument since using it may increase eddy-current losses produced in metal parts inside the
instrument, leading to burnout. In this case, use an approximate-effective value type.
∗3
When the setting of Pr. 192 A,B,C terminal function selection is positive logic
∗4
T/L3 is only for the three-phase power input specification models.
∗5
A digital power meter (designed for inverter) can also be used to measure.
Pf
1
P
1
3V
1
I
×
1
------------------------ 100
×
=
%
Pf
1
P
1
V
1
I
×
1
---------------- 100
×
=
%
Pf
2
P
2
3V
2
I
2
×
------------------------ 100
×
=
%
8VDC
T1
T2