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Mitsubishi Electric Manuals
Inverter
FR-A520-0.4K -55K
Instruction manual
Measurement Of Main Circuit Voltages, Currents And Power - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual
Transistorized inverter, high function & low acoustic noise
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Mitsubishi Electric
FR-A520-0.4K -55K
Instruction Manual
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5.3.8 Measurement of main circuit voltages, currents and power
z Measurement of voltages and currents
Since the voltages and currents on the inverter power supply and output sides include harmonics,
accurate measurement depends on the instruments used and circuits measured.
When instruments for commercial frequency are used for measurement, measure the following circuits
using the instruments given on the next page.
Ar
Vr
3-phase
power
As
supply
Vs
At
Vt
Instrument
types
Note: Use an FFT to measure the output voltage accurately. Accurate measurement cannot be made if you
use a tester or general measuring instrument.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Input voltage
Input current
Inverter
R 〈L
〉
W
U
Au
11
1
S 〈L
〉
W
V
12
2
Av
T 〈L
〉
W
W
Aw
13
3
P 〈+〉
〈–〉 N
2
5
V
+
-
Typical Measuring Points and Instruments
188
PROTECTIVE FUNCTIONS
W
12
Vu
To motor
Vv
W
22
Vw
Output voltage
Output current
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