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Measuring Points and Instruments
Measuring
Item
Point
Across R/L1-S/
Power supply voltage
L2, S/L2-T/L3, T/
V
1
L3-R/L1
Power supply side
R/L1, S/L2, and
current
T/L3 line currents
I
1
Power supply side
R/L1, S/L2, T/L3 and
power
R/L1-S/L2, S/L2-T/
P
L3, T/L3-R/L1
1
Calculate after measuring power supply voltage, power supply side current and power supply side power.
Power supply side
power factor
Pf
= ————— × 100%
Pf
1
1
Output side voltage
Across U-V, V-W
V
and W-U
2
Output side current
U, V and W line
I
currents
2
Output side power
U, V, W and U-V,
P
V-W
2
Calculate in similar manner to power supply side power factor.
Output side power
factor
Pf
= ————— × 100%
2
Pf
2
Converter output
Across P/ -N/
Across 2, 4 (positive)-
Frequency setting
5
signal
Across 1 (positive)-5
Across 10 (positive) -5
Frequency setting
Across 10E (positive)-
power supply
5
Across CA (positive)-5
Frequency meter
Across AM (positive)-
signal
5
Across STF, STR,
Start signal
RH, RM, RL, JOG,
Select signal
RT, AU, STOP, CS -
PC (positive)
Across RES-PC
Reset
(positive)
Across MRS-PC
Output stop
(positive)
Across A1-C1
Fault signal
Across B1-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.
Measuring Instrument
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
V
× I
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
V
× I
3
2
2
Moving-coil type (such as tester)
Moving-coil type
(Tester and such may be used)
(Internal resistance: 50k
Moving-coil type
(such as tester)
Measurement of main circuit voltages,
Remarks (Reference Measured Value)
Commercial power supply
Within permissible AC voltage fluctuation
*4
Refer to page 304.
*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)
or larger)
When open
20 to 30VDC
ON voltage: 1V or less
Continuity check
*3
<Normal>
Across A1-C1 Discontinuity
Across B1-C1
Continuity
currents and powers
V1
"5" is
common
"PC" is
common
<Fault>
Continuity
Discontinuity
299
6

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