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Mitsubishi Electric FR-CS84-012 Instruction Manual Page 234

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 Measuring points and instruments
Item
Measuring point
Between R/L1 and S/L2,
Power supply voltage
S/L2 and T/L3, or
V1
T/L3 and R/L1
Input current
R/L1, S/L2, T/L3 line
I1
current
R/L1, S/L2, T/L3, and
Input power
between R/L1 and S/L2,
P1
S/L2 and T/L3, or
T/L3 and R/L1
Calculate after measuring input voltage, input current, and input
power.
Input power factor
Pf1
Output voltage
Between U and V, V and
V2
W, or W and U
Output current
U, V and W line currents
I2
U, V, or W, and
Output power
between U and V, or V
P2
and W
Calculate in a similar manner to the input power
Output power factor
Pf2
factor.
Converter output
Between P/+ and N/-
Frequency setting signal
2, and between 4(+) and 5
Power supply for a
frequency setting
Between 10(+) and 5
potentiometer
Frequency meter signal
Between AM(+) and 5
Start signal
Between STF, STR, RH,
Select signal
RM, or RL, and SD (for
Reset signal
sink logic)
Output stop signal
Between A and C
Fault signal
Between B and C
*1
Use an FFT to measure the output voltage accurately. A tester or general measuring instrument cannot measure accurately.
*2
When the carrier frequency exceeds 5 kHz, 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.195 ABC terminal function selection is the positive logic
*4
A digital power meter (designed for inverter) can also be used to measure.
Measuring instrument
Moving-iron type AC
*4
voltmeter
Moving-iron type AC
*4
ammeter
Digital power meter
(designed for inverter) or
electrodynamic type
single-phase wattmeter
P
1
x 100%
Pf
=
1
I
3V
x
1
1
Rectifier type AC voltage
*1*4
meter
(moving-iron type cannot
measure.)
Moving-iron type AC
*2*4
ammeter
Digital power meter
(designed for inverter) or
electrodynamic type
single-phase wattmeter
P
2
Pf
=
x 100%
2
I
2
Moving-coil type
(such as tester)
Moving-coil type
(such as tester)
(internal resistance 50 kΩ
or more)
Moving-coil type
(such as tester)
Remarks (reference measured value)
Commercial power supply.
Within permissible AC voltage fluctuation. (Refer to
page
238.)
P1 = W11 + W12 + W13 (3-wattmeter method)
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.
P2 = W21 + W22
2-wattmeter method (or 3-wattmeter method)
Inverter LED indication 1.35 × V1
0 to 10 VDC, 4 to 20 mA
5.2 VDC
Approximately 10 VDC at
maximum frequency
(without frequency meter).
When open
20 to 30 VDC
ON voltage: 1 V or less
Continuity
*3
check
[Normal]
A - C
No
B - C
Yes
7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
7.2 Measurement of main circuit voltages, currents, and powers
2
2
3
4
5
6
7
8
9
Terminal 5 is a
common terminal.
10
Terminal SD or PC
is a common
terminal.
[Fault]
Yes
No
233

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