Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual page 321

Measuring Points and Instruments
Item Measuring Point
R/L1 and S/L2
Power supply voltage
S/L2 and T/L3
V 1
T/L3 and R/L1 ∗4
Power supply side
R/L1, S/L2, T/L3 line
current
current ∗4
I 1
R/L1, S/L2, T/L3 and
Power supply side
R/L1 and S/L2,
power
S/L2 and T/L3,
P 1
T/L3 and R/L1, ∗4
Calculate after measuring power supply voltage, power
supply side current and power supply side power.
Power supply side
[Three-phase power supply]
power factor
Pf
1
Pf
1
Across U and V,
Output side voltage
V and W,
V 2
W and U
Output side current
U, V and W line currents
I
2
U, V, W and
Output side power
U and V,
P
2
V and W
Calculate in similar manner to power supply side power factor.
Output side power
factor
Pf
2
Pf
2
Converter output Across P/+ and N/-
Across 2(+) and 5
Frequency setting
signal
Across 4(+) and 5
Frequency setting
Across 10(+) and 5
power supply
Frequency meter
Across FM(+) and SD
signal
Start signal Across SD and the following:
Select signal STF, STR, RH, RM, or RL(+)
Reset Across RES(+) and SD
Output stop∗6 Across MRS(+) and SD
Across A and C
Fault signal
Across B and C
∗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 models.
∗5
A digital power meter (designed for inverter) can also be used to measure.
∗6
Terminal MRS is only available for the standard control circuit terminal model.
Measurement of main circuit voltages, currents and powers
Measuring Instrument
Moving-iron type AC
voltmeter ∗5
Moving-iron type AC
ammeter ∗5
Digital power meter
(designed for inverter) or
electrodynamic type single-
phase wattmeter
P
1
×
= ----------------------- - 100 %
×
3V I
1 1
Rectifier type AC voltage
meter ∗1 ∗5
(moving-iron type cannot
measure)
Moving-iron type AC
ammeter ∗2 ∗5
Digital power meter
(designed for inverter) or
electrodynamic type single-
phase wattmeter
P
2
×
----------------------- - %
= 100
×
3V I
2 2
Moving-coil type
(such as tester)
Moving-coil type
(tester and such may be
(internal resistance 50kΩ or
Moving-coil type
(such as tester)
Remarks (Reference Measured Value)
Commercial power supply
Within permissible AC voltage fluctuation (Refer to
page 326)
P =W +W
1 11 12
[Single-phase power supply]
Pf = ----------------
1
V
Difference between the phases is within 1% of the
maximum output voltage.
Difference between the phases is 10% or lower of
the rated inverter current.
P W
2 = 21 +
2-wattmeter method (or 3-wattmeter method)
Inverter LED display is lit. 1.35 × V1
380V maximum during regeneration for 200V class
760V maximum during regeneration for 400V class
0 to 10VDC, 4 to 20mADC
5.2VDC
Approximately 5VDC at maximum
frequency (without frequency meter)
8VDC
used)
more)
Pulse width T1: Adjust with C0 (Pr. 900)
Pulse cycle T2: Set with Pr. 55
(frequency monitor only)
When open
20 to 30VDC
ON voltage: 1V or less
Electric continuity check ∗3
Across A and C
Across B and C
+W (3-wattmeter method)
13
P
1
×
100
%
×
I
1 1
W
22
"5" is
common
T1
T2
"SD" is
common.
<Normal> <Fault>
Discontinuity Continuity
Continuity Discontinuity
6
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