Measurement Of Main Circuit Voltages, Currents And Powers - Mitsubishi FR-E540-0.4K-EC 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 400V
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-0.4K to 2.2K do not use At, As, Vt, Vs, W12 and W13.
Input
voltage
Input
current
Inverter
Ar
L
W11
1
Vr
As
L
W12
2
Vs
At L
W13
3
Vt
+
V
+
Typical Measuring Points and Instruments
PROTECTIVE FUNCTIONS
Au
U W21
Vu
V Av
Vv
Aw
W
W22
Vw
−
−
184
Output
voltage
Output
current
To motor
:Moving-iron type
:Electrodynamometer type
:Moving-coil type
:Rectifier type
5