Mitsubishi F700 Series Instruction Manual page 371

Measurement of main circuit voltages,
currents and powers
Measuring Points and Instruments
Measuring
Item
Across R/L1and
Power supply voltage S/L2, S/L2 and T/
V L3, T/L3 and R/
1
L1
Power supply side
R/L1, S/L2, and
current
T/L3 line currents
I
1
R/L1, S/L2, T/L3 and
Power supply side
R/L1 and S/L2, S/L2
power
and T/L3, T/L3 and
P
1
R/L1
Calculate after measuring power supply voltage, power supply side current and power supply side power.
Power supply side
power factor
= ————— × 100%
Pf
Pf
1 1
Across U and V,
Output side voltage
V and W and W
V
2
and U
Output side current U, V and W line
I currents
2
Output side power U, V, W and U
P and V, V and W
2
Calculate in similar manner to power supply side power factor.
Output side power
factor
= ————— × 100%
Pf
2
Pf
2
Across P/ and
Converter output
N/
Across 2, 4 (positive)
and 5
Frequency setting
signal
Across 1 (positive)
and 5
Across 10 (positive)
and 5
Frequency setting
power supply
Across 10E (positive)
and 5
Across CA (positive)
and 5
Frequency meter
signal
Across AM (positive)
and 5
Across STF, STR,
Start signal RH, RM, RL, JOG,
Select signal RT, AU, STOP, CS
and PC (positive)
Across RES and PC
Reset
(positive)
Across MRS and PC
Output stop
(positive)
Across A1 and
C1
Fault signal
Across B1 and
C1
*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 5kHz, do not use this instrument since using it may increase eddy-current losses produced in metal parts
inside the instrument, leading to burnout. If the wiring length between the inverter and motor is long, the instrument and CT may generate
heat due to line-to-line leakage current.
*3 When the setting of Pr. 195 ABC1 terminal function selection is positive logic
*4 A digital power meter (designed for inverter) can also be used to measure.
360
Measuring Instrument
Point
Moving-iron type AC voltmeter
Moving-iron type AC ammeter
Digital power meter (designed for
lectrodynamic type
inverter) or e
single-phase wattmeter
P
1
× I
V
3
1 1
Rectifier type AC voltage meter
(Moving-iron type cannot measure)
Moving-iron type AC ammeter
Digital power meter (designed for
lectrodynamic type
inverter) or e
single-phase wattmeter
P
2
× I
V
3
2 2
Moving-coil type (such as tester)
Moving-coil type
(Tester and such may be used)
(Internal resistance: 50k or larger)
Moving-coil type
(such as tester)
Remarks (Reference Measured Value)
Commercial power supply
Within permissible AC voltage fluctuation
*4
Refer to page 366.
*4
P1=W11+W12+W13 (3-wattmeter method)
Difference between the phases is within ±1% of
*1 *4
the maximum output voltage.
Difference between the phases is 10% or lower
*2 *4
of the rated inverter current.
P = W + W
2 21 22
2-wattmeter method (or 3-wattmeter method)
Inverter LED display is lit. 1.35
0 to 10VDC, 4 to 20mA
0 to ±5VDC, 0 to ±10VDC
5.2VDC
10VDC
About 20mA at maximum frequency
Approximately 10DVC at maximum
frequency (without frequency meter)
When open
20 to 30VDC
ON voltage: 1V or less
Electric continuity check
<Normal>
Across A1 and C1 No conduction
Across B1 and C1 Conduction

V1
"5" is
common
"PC" is
common
*3
<Fault>
Conduction
No conduction