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Measurement Of Main Circuit Voltages, Currents And Powers - Mitsubishi Electric FR-E520 Instruction Manual

Transistorized inverter.
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6.1.8

Measurement of main circuit voltages, currents and powers

! ! ! ! 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.
Three-phase 200V
power input
Three-phase 400V
power input
Single-phase 100V
power input
Single-phase 200V
power input
3-phase
power
(Note 2)
Instrument types
Note: 1. Use FFT (Fast Fourier Transforms) to measure the output voltage accurately.
It cannot be measured accurately with a meter or general instrument.
2. For FR-E520S-0.1K to 0.75K and FR-E510W-0.1K to 0.75K do not use At,
As, Vt, Vs, W12 and W13.
Input
voltage
Input
current
Inverter
Ar
W11
R (L
Vr
As
S (L
W12
Vs
At
T (L
W13
Vt
P (+) N (-)
+
Typical Measuring Points and Instruments
MAINTENANCE/INSPECTION
Au
U
W21
)
1
Vu
Av
)
V
2
Vv
Aw
)
W
W22
3
Vw
V
210
Output
voltage
Output
current
To motor
:Moving-iron type
:Electrodynamometer type
:Moving-coil type
:Rectifier type

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