Measurement Of Main Circuit Voltages, Currents And Powers - Mitsubishi FR-E520-0.1KN Instruction Manual

5.3.8 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
Ar
3-phase
As
power
At
Instrument types
Note: Use FFT (Fast Fourier Transforms) to measure the output voltage
accurately.
It cannot be measured accurately with a meter or general instrument.
Input
voltage
Input
currents
Inverter
W11 R
(L
Vr
S
W12
(L
Vs
W13 T
(L
Vt
(+)
P
+
Typical Measuring Points and Instruments
PROTECTIVE FUNCTIONS
U Au
)
1
Vu
V Av
)
2
Vv
W Aw
)
3
Vw
(−)
N
V
−
(Note)
162
W12
To motor
W22
Output
voltage
Output
currents